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2005: Corbetta S; Bulfamante G; Cortelazzi D; Barresi V; Cetin I; Mantovani G; Bondioni S; Beck-Peccoz P; Spada A
Adiponectin expression in human fetal tissues during mid- and late gestation.
The Journal of clinical endocrinology and metabolism 2005;90(4):2397-402.
Adiponectin (ApN), an adipocytokine expressed in adipocytes with antidiabetic and antiatherogenic actions, has been detected in cord blood, suggesting a putative role in intrauterine fetal development. The aim of this study was to confirm the presence of ApN in the fetal circulation and directly investigate ApN expression in fetal tissues. The study showed high ApN levels in umbilical venous blood from fetuses [n = 44; 31.2 +/- 14.1 (sd) mg/liter in umbilical vs. 8.4 +/- 4.0 in maternal circulation (P < 0.0001)] that positively correlated with gestational age. By using RT-PCR, Western blotting, and immunohistochemistry, ApN was detected in several fetal tissues at mid- and late gestation (from 14 to 36 wk) but not in the placenta. ApN was expressed in tissues of mesodermic origin, i.e. brown and white adipocytes, skeletal muscle fibers of diaphragm and iliopsoas, smooth muscle cells of small intestine and arterial walls, perineurium and renal capsule, and tissues of ectodermal origin, i.e. epidermis and ocular lens. The distribution of ApN expression in nonadipose tissues showed a general decline during the progression of gestation. The unexpected pattern of ApN expression in the human fetus may account for the high ApN levels in cord blood and predicts novel roles for ApN during fetal development.

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