Comparison of the different animal modeling and therapy methods of premature ovarian failure in animal model
Stem Cell Research & Therapy volume 14, Article number: 135 (2023)
Incidence of premature ovarian failure (POF) is higher with the increase of the pace of life. The etiology of POF is very complex, which is closely related to genes, immune diseases, drugs, surgery, and psychological factors. Ideal animal models and evaluation indexes are essential for drug development and mechanism research. In our review, we firstly summarize the modeling methods of different POF animal models and compare their advantages and disadvantages. Recently, stem cells are widely studied for tumor treatment and tissue repair with low immunogenicity, high homing ability, high ability to divide and self-renew. Hence, we secondly reviewed recently published data on transplantation of stem cells in the POF animal model and analyzed the possible mechanism of their function. With the further insights of immunological and gene therapy, the combination of stem cells with other therapies should be actively explored to promote the treatment of POF in the future. Our article may provide guidance and insight for POF animal model selection and new drug development.
Premature menopause is closely associated with premature ovarian failure (POF), also known as premature insufficient ovarian failure (POI). The incidence of POF was 0.01% in women aged 20 years, 0.1% in women aged 30 years, and 1% in women aged 40 years . The etiology of POF is very complex and closely related to genetics, immune diseases, drugs, surgery, and psychological factors . Currently, according to the etiology of POF, the widely used POF animal models can be classified as chemotherapy drug-induced POF models, autoimmune POF models, POF models of mental stress, and galactose (GAL)-POF models. However, different POF animal model methods have their advantages and disadvantages. For example, the stability of POF animal models of autoimmune and mental stress is low. GAL-induced animal model can better simulate the physiological aging characteristics of clinical POF patients, but the success rate is lower. Hence, it is still a big challenge to select an ideal animal model for drug intervention and mechanism exploration.
Clinically, long-term hormone replacement therapy (HRT), mainly estrogen and progesterone, is the most common treatment for women with POF. The therapeutic and protective effects of some hormones, such as anti-Müllerian hormone (AMH), melatonin, and growth hormone (GH), have been confirmed and accepted. However, long-term use of HRT may increase the risk of cardiovascular disease and cancer . So far, POF is still clinically irreversible. It is an urgent need to find advanced treatment strategies. Recently, the role of stem cells in the treatment of POF animal models has been gradually explored. Stem cells can differentiate into ovarian cells in the microenvironment of POF, to supplement the number of normal ovarian cells . In addition, the regenerated ovarian cells by stem cells can secrete female hormone to maintain the hormone balance and improve women's symptom caused by the decline of ovarian function .
In our review, we firstly summarized different POF animal model methods and compared their advantages and disadvantages. Next, we summarized the recently published data on HRT and stem cells in the POF animal model. Our article may provide guidance and insight for POF animal model selection and new drug development.
Comparison of different POF animal models
POF animal model of chemotherapy drugs
It is estimated that more than 6.6 million women are diagnosed with cancer each year, approximately 10% of whom are aged younger than 40 years. The most important and common causes of POF are chemotherapy and radiation therapy in cancer treatment. Cytotoxic chemotherapy and radiotherapy have improved survival in many cases, but alterations in gonadal function are one of the most common long-term side effects of treatment. Some chemotherapeutic agents are associated with gonadal toxicity (e.g., cyclophosphamide (CTX), bucillamine, and nitrogen mustard), while others have minor or unquantifiable effects (e.g., doxorubicin (DOX), vinca alkaloid cisplatin (CIS), and nitrourea). An animal study showed that anticancer drugs (doxorubicin and paclitaxel) reduced the number of primitive and developing follicles in goat preantral follicles . Other studies have also shown that the incidence of POF in women with breast cancer treated with docetaxel + pirarubicin + ifosfamide (DTC) chemotherapy is higher than that in healthy women . Using CTX, methotrexate and fluorouracil (CMF) for more than 4 cycles increase the risk of infertility by more than 80% . The pathophysiological mechanism of chemotherapy-associated POF is that the drugs destroy DNA, induce apoptosis of normal ovarian follicles, and block ovarian vascularization, thus interfering with the functional and structural features of oocytes [8, 9]. Recently, the pathogenesis of POF has been understood to some extent, but an appropriate animal model of POF will benefit the development of new drugs and observation of efficacy. At present, the most common drugs include CTX, tripterygium glycosides (TG), busulfan (BF), CIS, DOX, etc.
CTX inhibits cell proliferation because of its strong immunosuppressive effect. It significantly improves the clinical symptoms of patients with refractory nephropathy and has been widely used in the nephrology field. However, it is associated with serious side effects on female gonads, leading to ovarian damage, manifested as menstrual disorder, secondary amenorrhea, and even POF. The animal model of CTX-induced POF is simple in operation, is short in cycle, and only needs a single dose. TG exists a killing effect on rapidly proliferating cells (such as ovarian follicle cells), the mechanism of which mainly leads to DNA base mismatch and DNA chain rupture. The effect of DNA damage leads to a decrease in estrogen secretion in the ovary, which negatively increases FSH. The disadvantage of the TG-induced POF animal model is that the modeling cycle is long, while the advantage is that oral administration is relatively safe compared with other drug models . CIS induces ovarian injury through the interaction of various factors, including activating apoptosis and the oxidative stress response in ovarian cells. CIS inhibits cellular DNA replication and RNA transcription, arrests cells in G2 phase, and leads to apoptosis. CIS-induced POF animal model has a low cost, a short cycle, low mortality and shows histological and endocrine changes similar to clinical POF ovaries. DOX is an anti-tumor antibiotic that inhibits the synthesis of RNA and DNA, and has the strongest inhibitory effect on RNA. A single intraperitoneal injection of DOX into ICR mice (7.5 mg/kg) resulted in a significant reduction in ovarian size and weight one month after treatment . However, this approach of the POF model has rarely been reported in other articles, it maybe that the effect of this acute injury model is unstable and uncertain.
Clinicially, chemotherapy drugs are widely used, and the damage caused by their toxicity cannot be ignored. How to balance the therapeutic effect and toxic reaction of chemotherapy drugs and improve the safety of clinical drugs are the primary problems. Thus, seeking the prevention and treatment measures, and exploring the occurrence and development mechanism of diseases are beneficial. Animal model studies are helpful to understand the occurrence and development of human diseases more conveniently and effectively.
The autoimmune POF animal model
Immune factors account for 10–30% of POF, which may be simple ovarian autoimmune disease or accompany by other immune diseases. Recent studies have shown that the risk of POF in women of childbearing age with autoimmune diseases is increasing. Early diagnosis of immune POF patients is challenging, and these patients are often in a state of ovarian failure at the time of treatment.
ZP3 glycoprotein is a critical zona pellucida glycoprotein and sperm receptor. Immunizing animals with ZP3 glycoprotein can cause ovaritis by activating T cells, and IgG antibodies against human recombinant ZP3 can lead to follicle destruction . The method of inducing immunocompromised POF mice with ZP3 glycoprotein is easy to establish, with a short cycle, high survival rate of mice (100%), and high success rate (80–90%). In addition, the mouse ZP3 protein shares 67% homology with human ZP3. ZP3 polypeptide induces mice to produce ZP3 polypeptide antibody, which binds to ovarian ZP3 to cause an immune response and interferes with information exchange between oocytes and granulosa cells. The above can induce ovarian atrophy, anovulation, and other manifestations, such as human POF. Hence, the ovarian histomorphology of the ZP3 polypeptide-induced POF mouse model is similar to that of human POF autoimmune ovaritis . The ZP3 glycoprotein-induced POF mouse model is a classical modeling method to explore the pathogenesis and pathological changes of autoimmune POF.
Another method of antoimmune POF animal is that the supernatant protein of ovarian tissue of rats combined with Freund's adjuvant serves as an ovarian antigen. The rat model of autoimmune POF was successfully established by subcutaneous injection of 0.35 mL of ovarian antigen three times every 10 days . Because this method is rarely used, it remains unclear what concentration of ovarian antigen can be used to successfully construct an autoimmune POF model. Moreover, studies have shown that removing the thymus of 3-day-old neonatal mice induces autoimmune ovaritis and leads to complete oocyte loss in adult mice . However, thymectomy for newborn mice is difficult to perform and has a high mortality rate.
The POF animal model of mental stress
Psychological stress, for example chronic anxiety, sadness, fear, and other negative emotions, can lead to POF by altering the function of the hypothalamic–pituitary–target gland axis, leading to the appearance of hypothalamic–pituitary–ovarian axis disorder. The failure of the feedback regulation of the hypothalamic–pituitary–ovarian axis disrupts the balance of the neuroendocrine–immune biomolecular network and ultimately leads to POF. Stress POF animal model can be constructed by alternately administering different frequencies of sound-light-electricity stimulation . The decrease in biomolecules in the hypothalamic–pituitary–adrenal axis led to a significant decrease in biomolecules in the hypothalamus (β-EP, IL-1, NOS and GnRH), leading to a hormone decrease in the target gland layer (E2) in the pituitary–ovarian axis; the pituitary layer (FSH and LH) showed little change . A chronic unpredictable mild stress (CUMS) model was constructed by alternating daily fasting and water deprivation, forced swimming, noise interference, and plantar electrical stimulation for 35 days. The results suggested that the CUMS rat model exhibited depression-like behaviors. CUMS causes psychological stress and decrease ovarian reserve in female rats . The advantages of this modeling approach are that it is consistent with known major causative agents of human POF, and pathogenic pathways and pathological changes are similar to clinical observations.
Galactose and other POF animal models
Galactosemia (GAL) is an autosomal recessive genetic disease caused by the deficiency of galactosidase in the body, resulting in the obstruction of the stereo isomerization process of GAL. Because of the accumulation of GAL and its metabolites in the body, patients eventually develop liver, kidney, eye, nervous, and reproductive system damage. The main clinical manifestation of reproductive system injury is POF or primary amenorrhea. The main mechanism is as follows: the level of GAL in the cell is increased, which is catalyzed by aldose reductase and then is converted to galactol. However, the cell cannot further metabolize GAL, so GAL accumulates in the cell and affects the normal osmotic pressure, causing cell dysfunction. However, the increase in GAL concentration will cause direct damage to granulosa cells, oocytes, and follicular membrane cells of ovarian tissue, while the metabolites of GAL will cause parenchymal damage to the ovary . The offspring of pregnant rats feeding with GAL from Day 3 to Day 21 postpartum showed different manifestations of ovarian dysfunction when they were adults . The model had a success rate of approximately 63%. Aging is the most common cause of POF. D-GAL can accelerate the ageing process, which is similar to observations of normal ageing processes. Hence, the D-GAL-induced model is widely used in aging-induced POF animal model studies . Approximately 75–96% of women have galactosamic gonadal dysfunction. This is because GAL awakens the biological activity of FSH and produces direct ototoxic effects . POF animal model can be successfully constructed by subcutaneously with D-Gal (200 mg/kg/d) daily for 42 days . The process of establishing the model is simple, and the time required is short.
Overall, the chemotherapy drug induced model is a classic and simple animal model for studying POF. However, there still exist many disadvantages. For example, CTX-induced POF animal model may exist many side effects, including myelosuppression and bleeding . TG-induced POF animal model needs long molding time . CIS-induced POF animal model is too toxic and may lead to death . The success rate of DOX-induced POF animal model is uncertain . The autoimmunity-induced model is most related to the etiology of human POF, but the operation of model is relatively complicated. Thymectomy for newborn mice is difficult to operate and has a high mortality rate . The psychological factor-induced model is consistent with the pathogenesis factors of POF. But the model construction time is long, and the stability of this kind of model must be further determined . Although the GAL animal model can better simulate the physiological aging characteristics of clinical POF patients, this model has a lower success rate and longer cycle . Table 1 systematically compares the advantages and disadvantages of different animal models of POF.
Common evaluation indicators of the POF animal model
Reasonable biological indicators are the key to judging the success of model construction and drug treatment effects. According to CALAS, the identification of experimental animal models requires the evaluation of their overall behavioral characteristics, tissues, organs, cells and molecules . The evaluation of POF animal models mainly includes fertility, hormone, ovary and follicle, and biomarker evaluation.
Fertility in the POF animal model
POF is a fertility decline disease caused by decreased ovarian reserve function, so the most intuitive detection method for animal models is the number of litters produced. In the animal model of POF, reproductive capacity is significantly reduced, including the fertility index (fraction of females that delivered offspring/total females), number of pups, and mean body weight of pups . The drug-induced POF animal model takes advantage of the side effects of chemotherapy drugs on ovarian tissues. In addition to acute damage to the ovaries, toxic side effects on other organs from chemotherapy drugs can markedly affect the survival status of rats. Hence, the rat weight sharply declines .
Histological assessment of the ovarian reserve in the POF animal model
The ovarian reserve refers to primordial follicles in the ovarian cortex of human females. Ovarian reserve tests are performed by directly or indirectly assessing the decline in the number of follicles . Ovarian reserve of histological assessment includes the ovary volume and weight, the number of corpuses luteum, the length of the estrous cycle, the follicle count, the ratio of the ovulation number and abnormal ovulation . In the ovarian tissues of the POF animal model, the ovarian volume and weight are decreased. Moreover, the corpus luteum, the ratio of the ovulation number and abnormal ovulation are lower, and the estrous cycle is extended. In addition, Pro-follicles, Pri-follicles, Snd-follicles, and antral follicles are reduced. However, atresia and apoptotic follicles are increased .
Endocrine aspects of the ovarian reserve in the POF animal model
Endocrine levels are indirect reflections of decreased ovarian reserve function in POF. Clinically, measurement of AMH levels is useful in assessing the reserve of follicles and may be useful in assessing fertility potential. The lower ofAMH represents a decrease in ovarian reserve function . The main role of FSH is to promote the growth and development of follicles and estrogen secretion. In addition, it can be used to identify the physiological condition of the female ovary. Clinically, an abnormally high value of FSH may indicates POF. LH and E2 can also be used as diagnostic criteria for POF. In the hormone secretion of the POF animal model, AMH and E2 are decreased, while FSH and LH are increased .
Biomarkers of granulosa cells in the POF animal model
Most studies claim that ovarian apoptosis caused by oxidative stress and mitochondrial damage is the main cause of POF . In the POF animal model, the expression of Ki67, Bcl2/Bax, and Caspase 3/9 is often used to measure ovarian proliferation and apoptosis levels. Follicle-stimulating hormone receptor (FSHR), a G protein-coupled receptor that binds to FSH, activates many intracellular signaling pathways, playing an important role in female follicle development and estradiol production. The gene mutation and downregulation of FSHR cause POI by preventing follicle development .
Overall, in the POF animal model, short-term measures of ovarian reserve function included a reduction in antral/atretic follicles and luteinization, disorder of the estrous cycle and hormone levels, and an increase in apoptotic biomarker expression. The long-term indicators were the decline in the fertility index and number of pups. Table 2 summarizes the common evaluation index of the POF animal model.
Current study of POF therapy in an animal model
HRT in the treatment of the POF animal model
AMH is a hormone secreted by granulosa cells in preantral follicles and small antral follicles of the ovary. Detection of AMH can determine the functional status of granulosa cells and number of follicles. It demonstrated that the recombinant AMH protein can increase primordial follicless, rescuing the fertility of a CTX-treated POF animal model. The protective mechanism of AMH on CTX-induced follicular loss may be related to autophagy .
Melatonin (N-acetyl-5-methoxytryptamine, honey), a hormone produced primarily by the pineal gland of the brain, can also be produced by peripheral reproductive tissue (the ovary, and the placenta). Many studies have shown that exogenous melatonin has protective effects on the nervous system, kidneys, lungs, testes, uterus, and ovaries [39, 40]. In ovarian tissues, as a free group purifier in follicles, melanin promotes egg maturation, embryo development, and luteinization of granuloma cells . It is reported that intraperitoneal administration of melatonin (15 or 30 mg/kg) for 15 days can successfully rescue CIS-induced primordial follicle loss by inhibiting phosphorylation of PTEN/AKT/FOXO3a pathway components and preventing FOXO3a nuclear shuttling in primordial follicles . Another study showed that melatonin (20 mg/kg/day) taken orally for 34 days can increase the number of primordial follicles and antral follicles, increase body and ovary weight, and enhance the level of AMH by attenuating the activation of SIRT1 signaling pathway .
As a member of the growth factor family, GH (a peptide hormone secreted by the anterior pituitary gland) plays a crucial role in regulating growth and development, the gonadal axis, metabolism, and the mental state. Using mouse recombinant mouse GH (rmGH) for CTX-induced POF can significantly reduced ovarian granulocyte injury and the number of atretic follicles, and significantly increased the number of mature oocytes. They confirmed that GH may promoted ovarian tissue repair and estrogen release by activating the Notch-1 signaling pathway in ovarian tissue . Subsequently, it confirmed that GH possesses a protective effect on ovarian tissue in the CTX-induced POF rat model by directly or indirectly promoting the balance between oxidative stress and oxidative detoxification of cells .
Table 3 lists the recent research status of HRT in the POF animal model. Although the short-term effects of HRT on POF animal models are effective, the long-term effects on fertility remain unknown. Thus, HRT has been little studied in animal models of POF. However, clinically, the improvement of POF symptoms mostly depends on personalized hormone treatment, aiming to maximize efficacy and reduce the associated risks.
Stem cells in the treatment of the POF animal model
Stem cells from adult tissues in the treatment of the POF animal model
After using HRT for POF, the risk of cancer and cardiovascular disease is increased. Recently, stem cell therapy has become increasingly popular in POF studies. BMSCs are a member of the adult stem cell family with low immunogenicity and generally exist in the bone marrow microenvironment. BMSCs are isolated from bone marrow extract. Density gradient centrifugation is a common method of preparing BMSCs derived from bone marrow . Under certain circumstances, BMSCs can renew and differentiate into different cells, such as bone, cartilage, and fat cells. Despite the low survival rate and limited differentiation potential of BMSCs after transplantation, cytokines secreted by the ovary can induce BMSCs to migrate to damaged tissues. In the ovarian microenvironment, BMSCs can inhibit inflammation, reduce OS, and regulate immunity to promote ovarian tissue repair by secreting cytokines (VEGF, HGF, IL-6) . The specific mechanism of BMSCs in the treatment of POF has been fully described in this article . However, the number of BMSCs is very limited, and the immunomodulatory properties of BMSCs vary among species. The aggressive procedure is painful for the patient and carries a risk of infection. In addition, their differentiation potential, number, and maximum lifespan significantly decrease with age. These factors greatly limit the clinical application of BMSCs.
ADMSCs have low immunogenicity and can secrete many important growth factors, cytokines, trophic factors, and regenerative factors. Compared with ADSCs from elderly donors, ADSCs from young donors showed a higher proliferation rate, and their differentiation ability still exists with age. Therefore, ADMSCs have advantages over BMSCs. ADSCs also maintain the potential to differentiate into cells of mesodermal origin. Their low immunogenicity makes them suitable for allogeneic transplantation and the treatment of drug-resistant immune diseases . ADMSCs have the advantages of availability and repeatability in autologous cell repair and regeneration . ADMSCs are usually derived from fat tissue during liposuction, lipoplasty, or isolated lipotomy procedures and are digested with collagenase, followed by centrifugation and washing . ADMSCs from the inguinal subcutaneous fat of 6–8-week-old nondiabetic rats can be obtained. It also demonstrated that ADMSC transplantation can reduce the expression of Pannexin1 and Caspase3 molecules to play an anti-apoptotic role in the ovarian tissues of a POF animal model. ADSCs stopped growing at 11~12 subculture, and the number of ADSCs was lower than that of BMSCs. Mazini et al. compared the advantages and disadvantages of ADMSCs as well as the research status of their therapeutic application .
HuMenSCs can be isolated from menstrual blood. HuMenSCs are much easier to repair than other adult stem cells, possibly making them a potential clinical donor source. Gargett et al. first extracted HuMenSCs, which can differentiate into adipocytes, osteoblasts, and lung epithelial cells . The therapeutic potential of HuMenSCs has been demonstrated in diabetes , myocardial infarction  and liver failure . Human endometrial mesenchymal stem cells (ESCs) derived from menstrual blood have the characteristics of mesenchymal stem cells (MSCs). MSC surface markers (CD29, CD44, CD49f, CD90, CD105 and CD117) and ESC markers (Oct4 and SSEA3/4) were highly expressed on the HuMenSC surface . It confirmed the differentiation of HuMenSCs into ovarian-like cells (especially GCs) by injecting HuMenSCs into CTX-induced POF rats through the tail vein . However, the source of HuMenSCs in menstrual blood is limited, and there is a risk of infection.
BMSCs, ADMSCs and HuMenSCs are adult MSCs that have been extensively studied in POF animal models at present. Table 4 summarizes the research status and possible mechanisms of three types of stem cells and their exosomes in POF animal models. Its main advantages are low immunogenicity, strong homing ability and strong ability to split and self-renew. However, most of their extraction procedures are invasive and carry the risk of infection.
Stem cells from neonatal tissues in the treatment of the POF animal model
Compared with adult tissue stem cells, human–neonatal tissue stem cells have lower immunogenicity, fewer ethical issues, a lower risk of infection, and a painless and noninvasive harvesting process and are easy to expand in vitro. Neonatal tissues such as the umbilical cord, placenta, amniotic membrane, or chorionic membrane can be obtained directly after delivery, avoiding invasive procedures and ethical concerns . Moreover, MSCs isolated from these neonatal tissues represent ontogenetic younger cells, at least as attractive candidates for tissue engineering and regenerative medicine. hUCMSCs are the most widely studied MSCs in human–neonatal tissue stem cells and are mainly extracted from different compartments of the human umbilical cord. Compared with BMSCs, hUCMSCs have extensive advantages. On the one hand, the extraction process is noninvasive, preventing the risk of infection. On the other hand, hUCMSCs show higher proliferation and differentiation activity and faster self-renewal. hUCMSCs maintained a stable doubling time (DT) until the 10th generation, and BMSCs showed notably increased DT after only the 6th generation. hUCMSCs have been widely investigated in clinical therapeutic phase I or II trials, such as spinal cord injury, Alzheimer’s disease, and liver failure . In recent years, hUCMSCs have received much attention due to their enormous therapeutic potential in POF therapy. Several studies have shown that the injection of hUCMSCs (1 × 106/mL in 100 μL of PBS) through the tail vein can effectively improve the ovarian status. The method of extracting hUCMSCs from the human umbilical cord is fast, painless, and low immunity. However, there are more moral and ethical issues. The research progress of hUCMSCs in the POF animal model has been detailedly reviewed .
HESC-MSCs are cells isolated from an early embryo (before the gastrula stage) or primitive gonad. Compared with other sources of MSCs, hESC-MSCs, they have a higher ability to proliferate and inhibit leukocyte growth . HESC-MSCs show stronger anti-inflammatory properties than BMSCs . HESC-MSCs can also overcome the obstacles encountered in harvesting MSCs from adult tissues, including the lack of appropriate donors, limited number of cells obtained in the acquisition process, limited ability to expand in vitro, and invasive nature of the procedure. HESC-MSCs have been shown to ameliorate chronic liver injury and autoimmune encephalitis. Bahrehbar et al. successfully extracted hESC-MSCs from the placenta and further confirmed that hESC-MSC transplantation was similar to BM-MSC transplantation, which can restore the structure and function of damaged ovarian tissue in CTX-induced POF mice and rescue fertility . hESC-MSC transplantation has long been a controversial area. Proponents argue that it can help cure many intractable diseases because hESC-MSCs can differentiate into multifunctional APSCs, which most closely resemble human development. Opponents argue that hESC-MSC transplantation requires the destruction of embryos, which is anti-bioethical.
HPMSCs contain several stem cells based on placental anatomy: chorionic villi (CV-MSCs), amniotic membrane (AM-MSCs), chorionic plate (CP-MSCs), and umbilical cord Wharton Jelly (WJ-MSCs) . Under the appropriate induction conditions, these placenta-derived MSCs can differentiate into various cell types. Compared with other stem cells from neonatal tissues, hESC-MSCs have the advantages of a convenient source, sufficient cell number, and easy isolation, culture, expansion, and purification, and they still possess the characteristics of stem cells after more than 30 generations. Transplantation of hESC-MSCs can restore the structure of damaged ovarian tissue and their function in CTX combined with BF-induced POF mice and rescue fertility. The possible mechanism is related to the promotion of follicle development, ovarian secretion, fertility, and ovarian cell survival through paracrine effects .
Human amniotic cells are divided into human amniotic epithelial cells (hAECs) and human amniotic mesenchymal stem cells (hAMSCs). Both cell types have the potential to differentiate into three layers of germ tissue. HAECs are a class of epithelial cells with stem cell characteristics that are not stem cells in nature because they cannot proliferate indefinitely. When hAECs were passaged to the fifth generation, the cells gradually became larger and older, and their proliferation ability was obviously weakened. However, hAMSCs could be transmitted to approximately the 30th generation without significant changes in cell morphology. hAMSCs had stronger differentiation and proliferation ability than hAECs. The biological characteristics of hAMSCs were superior to those of hAECs but were not superior in the expression of immune molecules. This effect may be because the cellular biological characteristics of hAMSCs, such as telomerase activity, expression level of pluripotent markers, cytokines, and collagen secretion, are superior to those of hAECs .
In addition to the above stem cells directly used in POF animal model therapy, other forms of stem cells have been investigated in POF treatment studies. Stem cell exosomes are a hot topic currently. Exosomes carry various microRNAs and proteins into target cells. Presently, exosomes from hUCMSCs and hAMSCs promote ovarian function by regulating the Hippo pathway and carry various microRNAs and proteins . Collagen/hUCMSCs and Matrigel/hUCMSCs can also promote MSC adhesion and increase cell retention in the ovary . In terms of the mode of administration in most animal studies, tail vein injections are the most widely used transplant method to deliver cells to recipients. However, most transplanted cells are trapped in the lungs and cannot reach the target organ. Hence, studies have designed sodium alginate-bioglass (SA-BG)-encapsulated hAECs to promote the adhesion properties, proliferative ability, migration, and homing ability of MSCs in the ovary . Table 5 lists the transplantation of stem cells from neonatal tissues in the POF animal model.
Immunological and gene therapy in POF animal model
In recent years, advances in immunology and genome medicine have improved our understanding of the pathogenesis of POF . An increased number of B cells, CD4+ T cells, Th17 cells, and a decreased CD8+ T cells, Treg cells in POF patients have been reported . Besides, the cytokines (IL-1α, IL-2, IL-6, IL-8, TNF-α, IFN-γ, IL-17 and IL-21) are upregulated [95, 96], and IL-10 is downregulated in POF patients . Based on these advances, many related treatments such as thymopentin (TP-5), Ab4B19, and prednisone have gradually become research hotspots. Zhu et al. demonstrated that thymopentin (TP-5) significantly reduces the proportion of activated T cells (CD3+/CD8+) and M1/M2 macrophages, and the expression of inflammatory factors was decreased . Co-administration of mouse zona pellucida 3 (mZP3) protein in combination with a DNA vaccine encoding the mZP3 gene can meliorate autoimmune ovarian disease through inducing Treg cells and anti-inflammatory cytokine production . A clinical prospective study showed that short-term treatment with a prednisone can increase serum E2 levels and improves follicle growth . However, the study requires a larger sample size.
Currently, most gene therapy research of POF is limited to the cellular and animal levels. These genes, including NEAT1/miR-654, miR-146a, miRNA-190a-5p, miR-146b-5p, miR-133b, and TRERNA1, are transferred into cells to ameliorate the POF symptoms by inhibiting apoptosis of ovarian granulosa cells (OGCs), stimulating estrogen synthesis, increasing the number of normal follicles, and decreasing the number of atretic follicle (Table 6) [100,101,102]. Gene therapy is still in experimental stage; it is not sure that whether the treatment will have a positive effect on patients.
Suitable and ideal POF animal models are essential carriers for drug development and mechanism research. Chemotherapy drug model is a classic animal model for studying POF. However, chemotherapy-induced POF animal model may exist many side effects, including myelosuppression and bleeding. POF animal model from autoimmunity and mental stress is the largest relationship with the etiology of POF, but the stability of the model needs to be further determined. GAL-induced animal model can better simulate the physiological aging characteristics of clinical POF patients, but the success rate is lower and the cycle time is longer. Hence, the study of the mechanism of POF and drug efficacy should select appropriate models according to the main purpose of the study. An ideal animal model would have the following characteristics: (1) the pathogenic pathways and processes like those observed in humans; (2) the pathological changes in the model can be reversed by drugs; (3) the reproducibility of the results . In the future, a model of POF constructed by injection of chemotherapy drugs and GAL under ultrasound guidance may reduce side effects and improve model success rate. Besides, more efforts should be made to study aging-related POF. For example, constructing aging-induced animal model studies the role of MSCs and their exosomes in restoring ovarian function.
The breakthrough discovery of MSCs makes them an ideal source for POF therapy. Many animal and preclinical studies of MSCs for POF treatment have been conducted; the clinical application of MSCs has big challenges, including insufficient cell sourcing, immunogenicity, subculture, and ethical issues. In addition, the long-term survival and self-renewal of stem cells in ovarian tissue remain to be further studied. In the future, it is necessary to establish a professional quality inspection system of MSC production to ensure the functional potential and microbiological safety of MSCs. More importantly, multicenter, large-sample phase II or III trials are expected to confirm the therapeutic and safety effect of stem cells on POF rather than just POF animal models. Especially, it is also worth considering whether the regenerative properties of MSCs can stimulate tumor regeneration in the future. Exosomes is smaller, easier to produce, and can carry various microRNAs and proteins into target cells without risk of tumor formation . Moreover, stem cell tissue engineering is also an effective strategy. Sodium alginate-bioglass (SA-BG)-encapsulated MSCs can support the survival of the transplanted cells at the initial phase of transplantation . Moreover, the combination of stem cells with other therapies (such as gene and immunotherapy) should be actively explored to promote the treatment of POF in the future.
Availability of data and materials
Premature ovarian failure
Premature insufficient ovarian failure
Hormone replacement therapy
Zona pellucida 3
Constructed chronic unpredictable mild stress
Follicle-stimulating hormone receptor
Recombinant mouse GH
Mesenchymal stem cells
Bone marrow mesenchymal stem cells
Adipose-derived mesenchymal stem cells
Human menstrual-derived stem cells
Human endometrial mesenchymal stem cells
Human umbilical cord mesenchymal stem cells
Human embryonic stem cell-derived MSCs
Human placenta-derived mesenchymal stem cells
Human amniotic mesenchymal stem cells
Human amniotic epithelial cells
Fetal liver mesenchymal stem cells
Transforming growth factor-beta
Vascular endothelial growth factor
Epidermal growth factor
Insulin-like growth factor 2
Human growth factor
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This research was funded by Key Research and Development Program of Hubei Province (2020BCB023); the National Natural Science Foundation of China, grant number (82071655, 81860276); Young Teacher Qualification Project of the Fundamental Research Funds for the Central Universities (2042020kf0088).
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Dai, F., Wang, R., Deng, Z. et al. Comparison of the different animal modeling and therapy methods of premature ovarian failure in animal model. Stem Cell Res Ther 14, 135 (2023). https://doi.org/10.1186/s13287-023-03333-4