TY - JOUR
T1 - Markers of cellular senescence are elevated in murine blastocysts cultured in vitro
T2 - molecular consequences of culture in atmospheric oxygen
AU - Meuter, Alexandra
AU - Rogmann, Lisa Marlen
AU - Winterhoff, Boris J.
AU - Tchkonia, Tamar
AU - Kirkland, James L.
AU - Morbeck, Dean E.
N1 - Publisher Copyright:
© 2014, Springer Science+Business Media New York.
PY - 2014/9/23
Y1 - 2014/9/23
N2 - Purpose: We aimed to determine whether embryo culture induces markers of cellular senescence and whether these effects were dependent on culture conditions.Methods: Murine blastocysts were derived in vitro and in vivo and assessed for 2 primary markers of senescence: senescence-associated β-galactosidase (SA-β-gal) and phosphorylated H2A.X (γ-H2A.X), the latter being a mark of DNA oxidative damage. Expression of senescence-associated genes p21, p16, and interleukin 6 (IL6) were also assessed.Conclusion: Elevated SA-β-gal, γ-H2A.X, and p21 suggest that in vitro stress can induce a senescence-like phenotype. Reduced oxygen during embryo culture minimizes these effects, providing further evidence for potential adverse effects of culturing embryos at ambient oxygen concentrations.Results: Compared with in vivo–derived blastocysts, in vitro embryos had high levels of SA-β-gal, nuclear γ-H2A.X, and p21 mRNA expression, indicating that a senescence-like phenotype is induced by in vitro culture. To determine the role of culture conditions, we studied the effect of oxygen (5 % vs 20 %) and protein supplementation on senescence markers. Blastocysts in reduced oxygen (5 %) had low levels of both SA-β-gal and γ-H2A.X compared with blastocysts cultured in ambient oxygen. Senescence markers also were reduced in the presence of protein, suggesting that antioxidant properties of protein reduce oxidative DNA damage in vitro.
AB - Purpose: We aimed to determine whether embryo culture induces markers of cellular senescence and whether these effects were dependent on culture conditions.Methods: Murine blastocysts were derived in vitro and in vivo and assessed for 2 primary markers of senescence: senescence-associated β-galactosidase (SA-β-gal) and phosphorylated H2A.X (γ-H2A.X), the latter being a mark of DNA oxidative damage. Expression of senescence-associated genes p21, p16, and interleukin 6 (IL6) were also assessed.Conclusion: Elevated SA-β-gal, γ-H2A.X, and p21 suggest that in vitro stress can induce a senescence-like phenotype. Reduced oxygen during embryo culture minimizes these effects, providing further evidence for potential adverse effects of culturing embryos at ambient oxygen concentrations.Results: Compared with in vivo–derived blastocysts, in vitro embryos had high levels of SA-β-gal, nuclear γ-H2A.X, and p21 mRNA expression, indicating that a senescence-like phenotype is induced by in vitro culture. To determine the role of culture conditions, we studied the effect of oxygen (5 % vs 20 %) and protein supplementation on senescence markers. Blastocysts in reduced oxygen (5 %) had low levels of both SA-β-gal and γ-H2A.X compared with blastocysts cultured in ambient oxygen. Senescence markers also were reduced in the presence of protein, suggesting that antioxidant properties of protein reduce oxidative DNA damage in vitro.
KW - Cellular senescence
KW - Embryo culture
KW - In vitro stress
KW - Oxidative stress
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U2 - 10.1007/s10815-014-0299-8
DO - 10.1007/s10815-014-0299-8
M3 - Article
C2 - 25106938
AN - SCOPUS:84918842703
SN - 1058-0468
VL - 31
SP - 1259
EP - 1267
JO - Journal of Assisted Reproduction and Genetics
JF - Journal of Assisted Reproduction and Genetics
IS - 10
ER -