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• W1499478544 abstract "The pro-opiomelanocortin-derived peptide alpha-melanocyte-stimulating hormone (alpha-MSH) mediates broad anti-inflammatory and immunomodulatory effects, which include inhibition of the production and release of proinflammatory cytokines and nitric oxide (NO) from macrophages. We investigated the effects of alpha-MSH, alpha-MSH(1-10), and alpha-MSH(11-13) on NO production and nuclear factor-kappaB (NF-kappaB) translocation in RAW 264.7 macrophages. After stimulation of the cells with bacterial lipopolysaccharide/interferon-gamma (LPS/IFN-gamma), all three peptides inhibited NO production with an order of potency alpha-MSH > or = alpha-MSH(11-13) > alpha-MSH(1-10). All three MSH peptides inhibited NF-kappaB nuclear translocation with the maximal effect of alpha-MSH and alpha-MSH(11-13) being seen in the range 1 nM-1 microM, and that of alpha-MSH(1-10) at 1 microM. By use of (125)I-(Nle(4),D-Phe(7))alpha-MSH(NDP-MSH) radioligand binding, MC(1) receptor-binding sites were demonstrated on RAW 264.7 cells. alpha-MSH and alpha-MSH(1-10) competed with the (125)I-NDP-MSH binding at these MC(1) receptor-binding sites, but alpha-MSH(11-13) even in concentrations up to 1 mM did not. Moreover, alpha-MSH and alpha-MSH(1-10) caused powerful stimulation of cyclic 3',5'-adenosine monophosphate (cAMP) in the RAW 264.7 cell, whereas alpha-MSH(11-13) was ineffective. Forskolin stimulated cAMP and inhibited NO production to the same extent as alpha-MSH and alpha-MSH(1-10), but did not modify the translocation of NF-kappaB. Whereas the protein kinase A inhibitor H89 did not modify the effect of alpha-MSH on NF-kappaB translocation, H89 caused a partial inhibition of the inhibitory effect of alpha-MSH, alpha-MSH(1-10), alpha-MSH(11-13), and forskolin on NO production. In addition alpha-MSH, alpha-MSH(1-10), alpha-MSH(11-13), and forskolin also inhibited the activity of an NF-kappaB-dependent luciferase reporter and these effects were partially counteracted by H89. We suggest that melanocortin peptides act via dual mechanisms of action: one cAMP-independent and causing inhibition of NF-kappaB translocation and the other dependent on MC(1) receptor/cAMP activation." @default.
• W1499478544 created "2016-06-24" @default.
• W1499478544 creator A5003177235 @default.
• W1499478544 creator A5059736207 @default.
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• W1499478544 date "2001-03-01" @default.
• W1499478544 modified "2023-10-16" @default.
• W1499478544 title "Effects of melanocortin peptides on lipopolysaccharide/interferon-gamma-induced NF-kappaB DNA binding and nitric oxide production in macrophage-like RAW 264.7 cells:" @default.
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• W1499478544 doi "https://doi.org/10.1016/s0006-2952(00)00583-9" @default.
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• W1499478544 hasPublicationYear "2001" @default.
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