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Biochemical and Biophysical Research Communications 1999-Sep

Alpha-MSH peptides inhibit production of nitric oxide and tumor necrosis factor-alpha by microglial cells activated with beta-amyloid and interferon gamma.

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D Galimberti
P Baron
L Meda
E Prat
E Scarpini
R Delgado
A Catania
J M Lipton
G Scarlato

키워드

요약

Alpha-melanocyte stimulating hormone (alpha-MSH) is an ancient tridecapeptide with potent inhibitory activity in all major forms of inflammation. The anti-inflammatory message sequence of alpha-MSH resides in the COOH-terminal tripeptide alpha-MSH[11-13]. We tested the influence of alpha-MSH[1-13] and of alpha-MSH[11-13] in a cultured murine microglia cell line known to produce nitric oxide (NO(-)(2)) and tumor necrosis factor (TNFalpha) when stimulated with beta-amyloid protein (Abeta). Melanocortin peptides significantly inhibited release of both NO(-)(2) and TNFalpha into cell-free supernatants from microglia stimulated with Abeta[1-42] or Abeta[25-35] peptides and interferon gamma (IFNgamma). Northern blot analysis demonstrated that alpha-MSH[1-13] and alpha-MSH[11-13] inhibited accumulation of inducible nitric oxide synthase (iNOS) and TNFalpha mRNA was triggered by Abeta stimulation. Abeta/microglial interaction is believed to promote the progression of inflammatory and neurodegenerative changes in senile plaques in Alzheimer's disease. Our data indicate that alpha-MSH peptides might be used to modulate the local response of the brain to Abeta deposition in this neurodegenerative disease.

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