OBJECTIVE: Oxidative stress plays a causative role in diabetic embryopathy. We tested whether mitigating oxidative stress, using superoxide dismutase 1 (SOD1) transgenic (Tg) mice, would block hyperglycemia-induced specific protein kinase C (PKC) isoform activation and its downstream cascade. STUDY DESIGN: Day 8.5 embryos from nondiabetic wild-type control (NC), diabetic mellitus wild-type (DM), and diabetic SOD1-Tg mice (DM-SOD1-Tg) were used for detection of phosphorylated (p-) PKCα/βII and p-PKCδ, and levels of 2 prominent PKC substrates, phosphorylated myristoylated alanine-rich protein kinase C substrate (MARCKS) and receptor for activated C kinase 1 (RACK1), and lipid peroxidation markers, 4-hydroxynonenal (4-HNE) and malondialdehyde (MDA). RESULTS: Levels of p-PKCα/βII, p-PKCδ, p-MARCKS, 4-HNE, and MDA were significantly elevated in the DM group compared with those in the NC group and the DM-SOD1-Tg group. The NC and DM-SOD1-Tg groups had comparable levels of these protein and lipid peroxidation markers. RACK1 levels did not differ among the 3 groups. CONCLUSION: Mitigating oxidative stress by SOD1 overexpression blocks maternal hyperglycemia-induced activation of specific PKC isoforms and downstream cascades.
OBJECTIVE: Oxidative stress plays a causative role in diabetic embryopathy. We tested whether mitigating oxidative stress, using superoxide dismutase 1 (SOD1) transgenic (Tg) mice, would block hyperglycemia-induced specific protein kinase C (PKC) isoform activation and its downstream cascade. STUDY DESIGN: Day 8.5 embryos from nondiabetic wild-type control (NC), diabetic mellitus wild-type (DM), and diabetic SOD1-Tgmice (DM-SOD1-Tg) were used for detection of phosphorylated (p-) PKCα/βII and p-PKCδ, and levels of 2 prominent PKC substrates, phosphorylated myristoylated alanine-rich protein kinase C substrate (MARCKS) and receptor for activated C kinase 1 (RACK1), and lipid peroxidation markers, 4-hydroxynonenal (4-HNE) and malondialdehyde (MDA). RESULTS: Levels of p-PKCα/βII, p-PKCδ, p-MARCKS, 4-HNE, and MDA were significantly elevated in the DM group compared with those in the NC group and the DM-SOD1-Tg group. The NC and DM-SOD1-Tg groups had comparable levels of these protein and lipid peroxidation markers. RACK1 levels did not differ among the 3 groups. CONCLUSION: Mitigating oxidative stress by SOD1 overexpression blocks maternal hyperglycemia-induced activation of specific PKC isoforms and downstream cascades.
Authors: E C Dempsey; A C Newton; D Mochly-Rosen; A P Fields; M E Reyland; P A Insel; R O Messing Journal: Am J Physiol Lung Cell Mol Physiol Date: 2000-09 Impact factor: 5.464
Authors: France Vaillancourt; Hassan Fahmi; Qin Shi; Patrick Lavigne; Pierre Ranger; Julio C Fernandes; Mohamed Benderdour Journal: Arthritis Res Ther Date: 2008-09-09 Impact factor: 5.156
Authors: Daoyin Dong; Yuji Zhang; E Albert Reece; Lei Wang; Christopher R Harman; Peixin Yang Journal: Reprod Toxicol Date: 2016-09-11 Impact factor: 3.143