Fig. 2
The levels of plasma KL-6, MDA, H2S, carnitine, and N-6 LC-PUFA in severe COVID-19 patients of hUC-MSCs and control group. A The level of KL-6 was significantly lower in hUC-MSCs group than that of control group (2585.5 ± 186.5 l vs. 3120.7 ± 158.3 U/ml, P < 0.001); B The hUC-MSC group had a lower level of MDA compared with control group (9.2 ± 0.54 vs. 9.91 ± 0.72 nmol/ml, P = 0.0361); C There was no significant difference in the level of H2S (60.19 ± 2.86 vs. 59.62 ± 2.17, P = 0.58); D There was no significant difference in the level of Carnitine (40.73 ± 5.01 vs. 43.100 ± 2.45, P = 0.122); E The hUC-MSC group had a higher level of N-6 LC-PUFAs compared with control group (200.1 ± 11.6 vs. 209.1 ± 11.3 pg/ml, P = 0.083). *, P < 0.05; **, P < 0.01; ***, P < 0.001. Abbreviations: MDA: malondialdehyde; N-6 LC-PUFAs: N-6 long-chain polyunsaturated fatty acids; KL-6: Krebs von den Lungen-6; hUC-MSCs: human umbilical cord mesenchymal stem cells