Data di Pubblicazione:
2008
Citazione:
Calpain activity contributes to the control of SNAP-25 levels in neurons / C. Grumelli, P. Berghuis, D. Pozzi, M. Caleo, F. Antonucci, G. Bonanno, G. Carmignoto, M.B. Dobszay, T. Harkany, M. Matteoli, C. Verderio. - In: MOLECULAR AND CELLULAR NEUROSCIENCES. - ISSN 1044-7431. - 39:3(2008 Nov), pp. 314-323.
Abstract:
Calpains are a family of calcium-dependent proteases with abundant expression in the CNS, and potent in cleaving some synaptic components. Assessment of calpain activity by its fluorescent substrate, Boc-Leu-Met-CMAC, revealed that cultured neurons display a significant level of constitutive enzyme activity. Notably, calpain activity differs in distinct neuronal populations, with a significantly higher level of activity in GABAergic cells. Using selectively-enriched cultures of fast-spiking GABAergic interneurons, we show that calpain activity partially contributes to the post-translational down regulation of SNAP-25, a calpain substrate, in differentiated GABA cells. In addition, we demonstrate that SNAP-25 is cleaved by calpain in response to acute seizures induced by intraperitoneal kainate injection in vivo. These data indicate that calpains in neurons are active even at physiological calcium concentrations and that different levels of calpain activation in selected neuron subtypes may contribute to the pattern of synaptic protein expression.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
C. Grumelli, P. Berghuis, D. Pozzi, M. Caleo, F. Antonucci, G. Bonanno, G. Carmignoto, M.B. Dobszay, T. Harkany, M. Matteoli, C. Verderio
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