Impaired hypothalamic leptin sensitivity in pseudopregnant rats treated with chronic prolactin to mimic pregnancy

Journal of Neuroendocrinology
R A AugustineS R Ladyman

Abstract

Pregnancy in rodents is associated with hyperphagia, increased fat deposition, elevated leptin concentrations and insensitivity to the satiety action of leptin. To investigate the hormonal mechanisms involved in the development of this state of pregnancy-induced leptin resistance, we have used a pseudopregnancy rat model. We have previously demonstrated that pseudopregnant rats have a normal feeding response to leptin, although, if pseudopregnancy is extended using chronic i.c.v. ovine prolactin infusion along with progesterone implants, then leptin no longer suppresses food intake. The present study aimed to investigate the effect of chronically high lactogen levels, as seen in mid-pregnancy, on leptin-induced activation of hypothalamic Janus kinase/signal transducer and activator of transcription (JAK/STAT) signal transduction and mRNA expression of leptin (LepR-B) and prolactin (Prlr-L) receptors, using pseudopregnant rats chronically infused with ovine prolactin. Groups of virgin (dioestrous) and pseudopregnant rats were treated with chronic i.c.v. infusion of either prolactin (2.5 μg μL-1  h-1 for 5 days) or vehicle (artificial cerebrospinal fluid [aCSF]) via a minipump connected to a cannula surgically implanted into the ...Continue Reading

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Apr 17, 2018·Endocrinology·Sharon Rachel LadymanDavid Ross Grattan

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Citations

Sep 4, 2019·American Journal of Physiology. Endocrinology and Metabolism·Pryscila D S TeixeiraJose Donato
Oct 2, 2020·Journal of Neuroendocrinology·Papillon GustafsonDavid R Grattan
Oct 10, 2020·Journal of Neuroendocrinology·Teodora GeorgescuDavid R Grattan
Nov 19, 2020·American Journal of Physiology. Gastrointestinal and Liver Physiology·Hui LiAmanda J Page
Jan 20, 2021·Journal of Neuroendocrinology·Felicitas Lopez-VicchiDamasia Becu-Villalobos

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