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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Neuronal differentiation of P19 embryonal carcinoma cells modulates kinin B2 receptor gene expression and function

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Autor(es):
Martins, Antonio Henrique B. ; Resende, Rodrigo R. ; Majumder, Paromita ; Faria, Marcella ; Casarini, Dulce E. ; Tárnok, Áttila ; Colli, Walter ; Pesquero, João Bosco ; Ulrich, Henning [9]
Número total de Autores: 9
Tipo de documento: Artigo Científico
Fonte: Journal of Biological Chemistry; v. 280, n. 20, p. 19576-19586, May 2005.
Área do conhecimento: Ciências Biológicas - Bioquímica
Assunto(s):Células-tronco de carcinoma embrionário
Resumo

Kinins are vasoactive oligopeptides generated upon proteolytic cleavage of low and high molecular weight kininogens by kallikreins. These peptides have a well established signaling role in inflammation and homeostasis. Nevertheless, emerging evidence suggests that bradykinin and other kinins are stored in the central nervous system and may act as neuromediators in the control of nociceptive response. Here we show that the kinin-B2 receptor (B2BKR) is differentially expressed during in vitro neuronal differentiation of P19 cells. Following induction by retinoic acid, cells form embryonic bodies and then undergo neuronal differentiation, which is complete after 8 and 9 days. Immunochemical staining revealed that B2BKR protein expression was below detection limits in nondifferentiated P19 cells but increased during the course of neuronal differentiation and peaked on days 8 and 9. Measurement of [Ca2+](i) in the absence and presence of bradykinin showed that most undifferentiated cells are unresponsive to bradykinin application, but following differentiation, P19 cells express high molecular weight neurofilaments, secrete bradykinin into the culture medium, and respond to bradykinin application with a transient increase in [Ca2+](i). However, inhibition of B2BKR activity with HOE-140 during early differentiation led to a decrease in the size of embryonic bodies formed. Pretreatment of differentiating P19 cells with HOE-140 on day 5 resulted in a reduction of the calcium response induced by the cholinergic agonist carbamoylcholine and decreased expression levels of M1-M3 muscarinic acetylcholine receptors, indicating crucial functions of the B2BKR during neuronal differentiation. (AU)

Processo FAPESP: 01/08827-4 - Modulação artificial da diferenciação neuronal e função de receptores por oligonucleotídeos sintéticos atuantes aos níveis gênico e protéico
Beneficiário:Alexander Henning Ulrich
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores