Chemokine ligand (CCL)-3 promotes an integrated febrile response when injected within pre-optic area (POA) of rats and induces calcium signaling in cells of POA microcultures but not TNF-alpha or IL-6 synthesis

Autor(es)

Soares, Denis Melo ^[1] ; Ott, Daniela ^[2] ; Melo, Miriam C. C. ^[1] ; Souza, Gloria E. P. ^[1] ; Roth, Joachim ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Pharmaceut Sci, Pharmacol Lab, Ribeirao Preto, SP - Brazil

^[2] Univ Giessen, Inst Vet Physiol, D-35392 Giessen - Germany

• Tipo de documento: Artigo Científico
• Fonte: BRAIN BEHAVIOR AND IMMUNITY; v. 34, p. 120-129, NOV 2013.
• Citações Web of Science: 8

Resumo

Although studies have shown that chemokines are pyrogenic when injected into the brain, there are no data indicating which cell types and receptors in the CNS are employed by chemokines such as CCL3 (synonym: MIP-1 alpha) to induce fever in rats. We aimed to study, whether CCL3 induces fever when injected directly into the thermoregulatory center within the pre-optic area (POA). Moreover, we investigated whether CCL3 activates cells from POA microcultures resulting in intracellular Ca++ mobilization and synthesis/release of TNF-alpha and IL-6. Microinjections of CCL3 into the POA induced a dose-dependent fever, which was accompanied by a decrease in tail skin temperature. The primary microcultures of the POA (from topographically excised rat pup brain tissue) were stimulated by bolus administrations of 100 mu l CCL3 (0.1 or 0.01 mu g) or sterile PBS as control. We evaluated the responses of 261 (30.89%) neurons, 346 (40.94%) astrocytes and 238 microglia cells (29.17%). Stimulation of rat POA microcultures with CCL3 was capable of inducing ca(++) signaling in 15.31% of all astrocytes and 5.75% of all neurons investigated. No cellular Ca++-signals were observed after overnight incubation of the cultures with antiCCR1 or antiCCR5 antibodies. CCL3 did not alter the release of the pyrogenic cytokines IL-6 or TNF-alpha into the supernatant of the cultures. In conclusion the present study shows for the first time that CCL-3 injected directly into the rat POA, evoked an integrated febrile response. In parallel this chemokine induces Ca++ signaling in astrocytes and neurons via both CCR1 and CCR5 receptors when administered to POA microcultures without stimulating the synthesis of TNF-alpha and IL-6. It is a possibility that CCL3-induced fever may occur via CCR1 and CCR5 receptors stimulation of astrocytes and neurons from POA. (C) 2013 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 01/11014-5 - Participacao das quimiocinas na resposta febril em ratos.
• Beneficiário: Denis de Melo Soares
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 03/04838-7 - Participacao da quimiocina rantes na resposta febril induzida pelos lps.
• Beneficiário: Renes de Resende Machado
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 08/10323-3 - Investigação dos mecanismos celulares e moleculares centrais envolvidos na febre induzida pela CCL3/MIP-1alpha
• Beneficiário: Denis de Melo Soares
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 97/09837-6 - Mecanismos e mediadores envolvidos na integração das respostas inflamatória e febril
• Beneficiário: Glória Emília Petto de Souza
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 02/02059-8 - Estudo dos efeitos antipiretico e antialgico do ibuprofeno em ratos.
• Beneficiário: Rodrigo Cristofoletti
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica