Abstract
Molecular mechanisms of the immunomodulatory effects of leptin and ghrelin in concentrations typical for preg–nancy on the maturation and functional activity of dendritic cells (DCs) generated from the peripheral blood monocytes of women are investigated. The presence of leptin during DC maturation did not affect the levels of CD83+CD1c+, CD86+CD1c+, and HLA–DR+CD1c+ DCs, but increased the amount and the activity of the enzyme indoleamine 2,3–dioxygenase (IDO). Cell culturing in the presence of ghrelin or combination of leptin and ghrelin reduced the percentage of CD86+CD1c+ DCs but did not affect the levels of CD83+CD1c+ and HLA–DR+CD1c+ DCs. In addition, ghrelin reduced the number of IDO molecules without affecting its activity. Simultaneous presence of leptin and ghrelin increased induced IDO activity without affecting the amount of the enzyme in DCs. The effects of leptin and ghrelin on the investi–gated functions of DCs in some cases correlated with high levels of cAMP. New mechanisms for leptin and ghrelin regula–tion of tolerogenic functions of DCs in pregnancy are proposed.
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Abbreviations
- AC:
-
adenylate cyclase
- AMPK:
-
AMP-activated protein kinase
- CaM:
-
calmodulin
- cAMP:
-
3′,5′-cyclic adenosine monophosphate
- CDs:
-
clusters of differentiation, molecule expressed on the surface of immune system cells
- CREB:
-
cAMP response element-binding (CRE)
- DAG:
-
diacylglycerol
- DC:
-
dendritic cell
- Epac:
-
exchange protein directly activated by cAMP
- ERK:
-
extracellular signal-regulated kinase
- GHS-R:
-
receptor of ghrelin
- HLA-DR:
-
human leukocyte antigen DR
- IDO:
-
indoleamine 2,3-dioxygenase
- IL:
-
interleukin
- IP3:
-
inositol 1,4,5-triphosphate
- ITIM2:
-
immunoreceptor tyrosine-based inhibito-ry motifs 2
- JAK:
-
Janus kinase
- JNK:
-
c-Jun N-terminal kinase
- LepR:
-
receptor of leptin
- LPS:
-
lipopolysaccharide
- MAPK:
-
mito-gen-activated protein kinase
- MyD88:
-
myeloid differentiation primary response 88
- NF-κB:
-
nuclear factor kappa-light-chain-enhancer of activated B cells
- p38MAPK:
-
p38 mitogen-activated protein kinase
- PDE3B:
-
phosphodiesterase 3B
- PI3K:
-
phospho-inositide 3-kinase
- PIP2:
-
phosphatidylinositol 4,5-bisphosphate
- PKA:
-
protein kinase A
- PKB(Akt):
-
protein kinase B
- PKC:
-
pro-tein kinase C
- PLC:
-
phospholipase C
- SOCS3:
-
suppressors of cytokine signaling 3
- STAT3:
-
signal transducer and activator of tran-scription-3
- TLR-4:
-
Toll-like receptor-4
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Originally published in Biochemistry (Moscow) On-Line Papers in Press, as Manuscript BM18-187, November 12, 2018.
Published in Russian in Biokhimiya, 2019, Vol. 84, No. 1, pp. 63–73.
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Orlova, E.G., Shirshev, S.V. & Loginova, O.A. Mechanisms of Leptin and Ghrelin Action on Maturation and Functions of Dendritic Cells. Biochemistry Moscow 84, 1–10 (2019). https://doi.org/10.1134/S0006297919010012
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DOI: https://doi.org/10.1134/S0006297919010012