Leptin gene in rabbit: cloning and expression in mammary epithelial cells during pregnancy and lactation.

Abstract:

:Leptin is known as a cytokine mostly produced by fat cells and implicated in regulation of energy metabolism and food intake but has also been shown to be involved in many physiological mechanisms such as tissue metabolism and cell differentiation and proliferation. In particular, leptin influences the development of mammary gland. Although leptin expression in mammary gland has been studied in several species, no data are available in the rabbit. Leptin transcripts in this species have been described as being encoded by only two exons rather than three as in other species. Our focus was to clone and sequence the rabbit leptin cDNA and to prepare the recombinant biologically active protein for validation of the proper sequence and then to describe leptin expression in rabbit mammary gland during different stages of pregnancy and lactation. The leptin sequence obtained was compared with those of other species, and genome alignment demonstrated that the rabbit leptin gene is also encoded by three exons. Additionally, we analyzed the expression of leptin during pregnancy and lactation. Leptin mRNA was weakly expressed throughout pregnancy, whereas mRNA levels were higher during lactation, with a significant increase between days 3 and 16. Leptin transcripts and protein were localized in luminal epithelial cells, thus indicating that leptin synthesis occurs in this compartment. Therefore, mammary synthesized leptin may constitute a major regulator of mammary gland development by acting locally as an autocrine and/or paracrine factor. Furthermore, our results support the possible physiological role of leptin in newborns through consumption of milk.

journal_name

Physiol Genomics

journal_title

Physiological genomics

authors

Koch E,Hue-Beauvais C,Galio L,Solomon G,Gertler A,Révillon F,Lhotellier V,Aujean E,Devinoy E,Charlier M

doi

10.1152/physiolgenomics.00020.2013

subject

Has Abstract

pub_date

2013-08-01 00:00:00

pages

645-52

issue

15

eissn

1094-8341

issn

1531-2267

pii

physiolgenomics.00020.2013

journal_volume

45

pub_type

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