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Molecular Mechanisms of Regulation of Functional Activity of Mononuclear Phagocytes by Leptin

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Abstract

Leptin is a peptide hormone synthesized by adipocytes. The main function of leptin is associated with regulation of the body energetic balance and restriction of excess accumulation of fat. This review considers in detail the involvement of leptin in regulation of fundamental effector functions of mononuclear phagocytes, which express receptors for this hormone. Possible molecular mechanisms of modulation by leptin of phagocytic activity, oxygen-dependent microbicidity, and nitric oxide generation by mononuclear phagocytes are analyzed, as well as the role of leptin in the formation of the produced cytokine pattern. The data presented suggest that the regulation of mononuclear phagocytes by leptin is associated with activation of the JAK/STAT signaling pathway, which leads to stimulation of phagocytosis, production of oxygen and nitrogen reactive species, and also to increase in secretion of pro-inflammatory cytokines.

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Abbreviations

EPR:

endoplasmic reticulum

AP 1:

activating protein-1

CD:

membrane molecules of lymphomyeloid cells

CaN:

calcineurine

CR:

receptor to complement components

DAG:

diacylglycerol

ERK:

extracellularly regulated protein kinase

FcR:

Fc-receptors

G-CSF:

granulocytic colony-stimulating factor

GM-CSF:

granulocytic-macrophagal colony-stimulating factor

IL:

interleukins

IP3 :

inositol 1,4,5-triphosphate

JNK:

c-Jun-NH2-terminal protein kinase

MAPK:

mitogen-activated protein kinase

MARCKS:

myristoylated alanine-rich C kinase substrate, or actinogelin

MLCK:

myosin light-chain kinase, or ERKII-induced MLC kinase

MR:

mannose receptor

NFAT:

nuclear factor of activated T-cells

NF-kB:

nuclear factor kB

Ob-R:

leptin receptor

PKC:

protein kinase C

PLC:

phospholipase C

PLA2 :

phospholipase A2

PIP2 :

phosphatidylinositol 4,5-diphosphate

PtdIns(3,4,5)P3 :

phosphatidylinositide 3,4,5-triphosphate

PI3-K:

phosphatidylinositol-3 kinase

STAT:

proteins of signal transduction and activation of transcription

Sam68:

RNA-binding protein

SOCS-3:

suppressor of cytokine signal transduction

Th:

T-helpers

TNF-α:

tumor necrosis factor α

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Correspondence to E. G. Orlova.

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Translated from Biokhimiya, Vol. 70, No. 8, 2005, pp. 1021–1029.

Original Russian Text Copyright © 2005 by Shirshev, Orlova.

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Shirshev, S.V., Orlova, E.G. Molecular Mechanisms of Regulation of Functional Activity of Mononuclear Phagocytes by Leptin. Biochemistry (Moscow) 70, 841–847 (2005). https://doi.org/10.1007/s10541-005-0193-1

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