Anti-inflammatory effects of alpha-melanocyte-stimulating hormone against rat endotoxin-induced uveitis and the time course of inflammatory agents in aqueous humor.

Abstract

PURPOSE:

We examined the effects of the immunosuppressive neuropeptide alpha-melanocyte stimulating hormone (alpha-MSH) on rat endotoxin-induced uveitis, and to measure the expression of inflammatory cytokines and chemokines with and without the alpha-MSH treatment over the course of the disease.

METHODS:

We injected Lewis rats once with Salmonella typhimurium lipopolysaccharide (LPS) to induce uveitis. The rats were given intravenous injections of 250, 500 or 1000 microg of alpha-MSH. The eyes were examined over the next 24 h for inflammation. Aqueous humor was collected 6, 12 and 24 h after endotoxin injections and the number of infiltrating cells were counted in anterior chamber. In addition, we assayed the concentration of protein, nitric oxide, TNF-alpha, IL-6, MCP-1 and MIP-2.

RESULTS:

Rats injected with alpha-MSH showed a significant decrease in the number of infiltrating cells in anterior chamber. Moreover, alpha-MSH-treated rats with endotoxin-induced uveitis (EIU) showed significantly lower concentrations of protein, nitric oxide, proinflammatory cytokines and chemokines in their aqueous humor. Even the early stages of EIU were suppressed by the injection of alpha-MSH.

CONCLUSIONS:

Our results demonstrate that the immunosuppressive neuropeptide alpha-MSH inhibits the early induction events of endotoxin-induced inflammation in the eye; therefore, suppresses the subsequent infiltration of cells and intraocular production of inflammatory cytokines and chemokines in eyes. alpha-MSH has a possibility of being a therapeutic strategy for anterior uveitis.

• Authors: Tomomi Nishida, Shoji Miyata, Yoshiki Itoh, Nobuhisa Mizuki, Kazuhiro Ohgami, Kenji Shiratori, Iliyana Bozhidarova Ilieva, Shigeaki Ohno, Andrew W Taylor
• Journal: International immunopharmacology (Int Immunopharmacol) Vol. 4 Issue 8 Pg. 1059-66 (Aug 2004) ISSN: 1567-5769 [Print] Netherlands
• PMID: 15222980 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Anti-Inflammatory Agents, Non-Steroidal
• Cytokines
• Immunosuppressive Agents
• Lipopolysaccharides
• Nitric Oxide
• alpha-MSH

Topics

• Animals
• Anti-Inflammatory Agents, Non-Steroidal (administration & dosage, pharmacokinetics, therapeutic use)
• Aqueous Humor (metabolism)
• Cytokines (metabolism)
• Dose-Response Relationship, Drug
• Immunosuppressive Agents (administration & dosage, pharmacokinetics, therapeutic use)
• Lipopolysaccharides
• Male
• Nitric Oxide (metabolism)
• Rats
• Rats, Inbred Lew
• Salmonella typhimurium
• Time Factors
• Uveitis (chemically induced, drug therapy)
• alpha-MSH (administration & dosage, pharmacokinetics, therapeutic use)