The Expression of IGFBP-5 in the Reproductive Axis and Effect on the Onset of Puberty in Female Rats

Overview

Journal Reprod Biol Endocrinol

Publisher Biomed Central

Specialties Endocrinology
Reproductive Medicine

Date 2022 Jul 12

PMID 35821045

Authors

Zhiqiu Yao

Maosen Lin

Tao Lin

Xinbao Gong

Pin Qin

Hailing Li

Tiezhu Kang

Jing Ye

Yanyun Zhu

Qiwen Hong

Ya Liu

Yunsheng Li

Juhua Wang

Fugui Fang

Affiliations

Soon will be listed here.

Abstract

Insulin-like growth factor-binding protein-5 (IGFBP-5) has recently been shown to alter the reproductive capacity by regulating insulin-like growth factor (IGF) bioavailability or IGF-independent effects. The present study aimed to investigate the effect and mechanism of IGFBP-5 on the onset of puberty in female rats. Immunofluorescence and real-time quantitative PCR were used to determine the expression and location of IGFBP-5 mRNA and protein distribution in the infant's hypothalamus-pituitary-ovary (HPO) axis prepuberty, peripuberty, puberty and adult female rats. Prepubertal rats with IGFBP-5 intracerebroventricular (ICV) were injected to determine the puberty-related genes expression and the concentrations of reproductive hormones. Primary hypothalamic cells were treated with IGFBP-5 to determine the expression of puberty-related genes and the Akt and mTOR proteins. Results showed that Igfbp-5 mRNA and protein were present on the HPO axis. The addition of IGFBP-5 to primary hypothalamic cells inhibited the expression of Gnrh and Igf-1 mRNAs (P < 0.05) and increased the expression of AKT and mTOR protein (P < 0.01). IGFBP-5 ICV-injection delayed the onset of puberty, reduced Gnrh, Igf-1, and Fshβ mRNAs, and decreased the concentrations of E2, P4, FSH,serum LH levels and the ovaries weight (P < 0.05). More corpus luteum and fewer primary follicles were found after IGFBP-5 injection (P < 0.05).

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