Rescue of obesity-induced infertility in female mice due to a pituitary-specific knockout of the insulin receptor.
Obesity is associated with insulin resistance in metabolic tissues such as adipose, liver, and muscle, but it is unclear whether nonclassical target tissues, such as those of the reproductive axis, are also insulin resistant. To determine if the reproductive axis maintains insulin sensitivity in obesity in vivo, murine models of diet-induced obesity (DIO) with and without intact insulin signaling in pituitary gonadotrophs were created. Diet-induced obese wild-type female mice (WT DIO) were infertile and experienced a robust increase in luteinizing hormone (LH) after gonadotropin-releasing hormone (GnRH) or insulin stimulation. By contrast, both lean and obese mice with a pituitary-specific knockout of the insulin receptor (PitIRKO) exhibited reproductive competency, indicating that insulin signaling in the pituitary is required for the reproductive impairment seen in DIO and that the gonadotroph maintains insulin sensitivity in a setting of peripheral insulin resistance.
Brothers
Kathryn J
KJ
Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
Wu
Sheng
S
DiVall
Sara A
SA
Messmer
Marcus R
MR
Kahn
C Ronald
CR
Miller
Ryan S
RS
Radovick
Sally
S
Wondisford
Fredric E
FE
Wolfe
Andrew
A
D000818:Animals; D004032:Diet; D030762:Estrous Cycle / Q000502:physiology; D005260:Female; D007987:Gonadotropin-Releasing Hormone / Q000378:metabolism; D007247:Infertility, Female / Q000209:etiology* / Q000235:genetics; D007328:Insulin / Q000378:metabolism; D007333:Insulin Resistance / Q000502:physiology; D007986:Luteinizing Hormone / Q000378:metabolism; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D009765:Obesity / Q000150:complications*; D010902:Pituitary Gland / Q000378:metabolism / Q000502:physiology*; D011972:Receptor, Insulin / Q000235:genetics* / Q000378:metabolism; D012098:Reproduction / Q000502:physiology; D015398:Signal Transduction / Q000502:physiology
D007328:Insulin; D007987:Gonadotropin-Releasing Hormone; D007986:Luteinizing Hormone; D011972:Receptor, Insulin
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