Regulation of free and bound leptin and soluble leptin receptors during inflammation in mice.

Abstract:

:Leptin, an appetite-regulating hormone/cytokine, circulates both free and bound to soluble leptin receptors (s-leptin R). An electrochemiluminescence (ECL) assay for the quantitative measurement of murine s-leptin R was developed. The absence of s-leptin R immunoreactivity in the serum of db(pas)/db(pas)mice demonstrated the specificity of the assay, which detected s-leptin R both in the free form and complexed with leptin. The distribution of free vs bound leptin and the regulation of s-leptin R were evaluated in mice following administration of the pro-inflammatory stimuli endotoxin (100 microg/mouse) and turpentine (100 microl/mouse). Both endotoxin and turpentine significantly increased serum leptin and s-leptin R levels compared to control mice. The distribution of free vs bound leptin was not altered by administration of endotoxin or turpentine. In fact, approximately 50% of total leptin was present in the free form in either control, endotoxin- or turpentine-injected mice. On the contrary, during the hyperleptinemia of pregnancy, only 10% of total leptin was present in the free form. We conclude that inflammation leads to the increase of both bound and free leptin. Therefore, the total amount of bioactive leptin is increased during acute inflammation, suggesting that leptin participates in the host response to inflammation.

journal_name

Cytokine

journal_title

Cytokine

authors

Voegeling S,Fantuzzi G

doi

10.1006/cyto.2001.0859

keywords:

subject

Has Abstract

pub_date

2001-04-21 00:00:00

pages

97-103

issue

2

eissn

1043-4666

issn

1096-0023

pii

S1043-4666(01)90859-2

journal_volume

14

pub_type

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