MSC, regardless of the low expression of both heme oxygenases 1 or 2, show high resistance to hemin or hydrogen peroxide. LDH release in MSC Hmox1+/+ or Hmox1−/− treated with H2O2
(A) or hemin (B) in low or high glucose medium. Cell death in MSC Hmox1+/+ or Hmox1−/− treated with increasing concentrations of hemin for 6 h, assessed with 7-AAD staining and flow cytometry (C). Data are shown as mean ± SD. ***p < 0.001 two-way ANOVA with Bonferroni post-test, N = 3. Total antioxidant capacity of conditioned media from MSC Hmox1+/+ or Hmox1−/−, measured with TAC kit (N = 4) (D). (E) Expression of Hmox1, (F)
Hmox2 in murine bone marrow PAC and MSCs isolated from Hmox1+/+ or Hmox1−/− mice, ****p < 0.0001 MSC versus PAC; two-way ANOVA with Bonferroni post-test, N = 3. 7-AAD, 7-aminoactinomycin D; ANOVA, analysis of variance; LDH, lactate dehydrogenase; PAC, pro-angiogenic cell; TAC, total antioxidant capacity.