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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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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DOI: https://doi.org/10.1007/s10541-005-0193-1