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Target Cell Response to Hormones01:22

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Hormones intricately bind to receptors on the surface or within target cells, initiating a cascade of cellular responses.
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Estrogens induce visfatin expression in 3T3-L1 cells.

Jingyu Zhou1, Edward R Seidel

  • 1Department of Physiology, Brody School of Medicine at East Carolina University, Greenville, NC 27858, USA.

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|December 17, 2009
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Pregnancy hormones, including estriol, estradiol, and progesterone, synergistically increase visfatin gene expression. This insulinomimetic protein may play a role in maternal and fetal glucose metabolism during pregnancy.

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Area of Science:

  • Endocrinology
  • Metabolic Research
  • Molecular Biology

Background:

  • Visfatin, a 56 kDa protein, is overexpressed during pregnancy.
  • Visfatin exhibits insulinomimetic properties, inducing GLUT 4 translocation and glucose uptake in 3T3-L1 cells.
  • Pregnancy is characterized by elevated levels of estradiol, estriol, and progesterone.

Purpose of the Study:

  • To investigate the effect of pregnancy hormones on visfatin gene expression.
  • To explore the potential physiological role of visfatin in pregnancy-related glucose metabolism.

Main Methods:

  • 3T3-L1 cells were treated with individual pregnancy hormones (estriol, estradiol, progesterone) or a combination thereof.
  • Visfatin gene expression was quantified following hormonal treatment.
  • GLUT 4 translocation and glucose uptake were assessed in response to visfatin.

Main Results:

  • Estriol significantly increased visfatin gene expression (2.5-fold).
  • Combined treatment with estriol, estradiol, and progesterone resulted in a synergistic 13-fold increase in visfatin gene expression.
  • Visfatin demonstrated potent induction of GLUT 4 translocation and glucose uptake.

Conclusions:

  • Pregnancy hormones, particularly estriol, estradiol, and progesterone, synergistically upregulate visfatin gene expression.
  • Visfatin's insulinomimetic activity suggests a potential role in regulating maternal-fetal glucose metabolism during pregnancy.
  • Elevated visfatin during pregnancy may be a compensatory mechanism for insulin resistance or to ensure fetal glucose supply.