C reactive protein Diabetes, Gestational Female Humans Pregnancy cytokine down regulation female glucose transporter 4 glutathione peroxidase human insulin insulin resistance interleukin 6 metabolism oxidative stress pathology pathophysiology pregnancy pregnancy diabetes mellitus protein kinase B superoxide dismutase Akt signaling Amyloid beta-Peptides Animals Antioxidants Article Blood Glucose Boron concentrations C peptide