High levels of filamentous actin and apoptosis correlate with mast cell refractoriness under alloxan-evoked diabetes

Life Sciences
Emiliano de Oliveira BarretoPatrícia M R E Silva

Abstract

Mast cell number and reactivity were shown to be down-regulated under diabetic conditions. Since the balance between globular and filamentous actin plays a pivotal role in the activity of secretory cells, we investigated whether an imbalance in that system could underlie the hyporesponsiveness of mast cells in diabetes. The apoptotic state was also evaluated. By means of rhodamine/phalloidine staining of F-actin, we noted that diabetic mast cells exhibited an increase in fluorescence intensity and reduction in cellular size, when compared with cells from normal animals, in parallel with elevation in the percentage of cells developing apoptosis. The levels of Bax, a pro-apoptotic member of Bcl-2 family, appeared increased at baseline in mast cells from diabetic rats compared with normal cells. These phenomena correlated with reduction in histamine and PGD2 release following antigen challenge in vitro. The steroid antagonist RU 486 abolished the reduction of histamine secretion from diabetic mast cells. We conclude that hyporesponsiveness of mast cells noted in diabetes may be accounted for by reduction in actin filament plasticity, in clear association with the rise in the percentage of cells undergoing apoptosis. In addition, t...Continue Reading

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Citations

Apr 22, 2008·Tissue & Cell·M Meuser-BatistaA Henriques-Pons
Apr 2, 2009·International Journal of Experimental Pathology·Vinicius de Frias CarvalhoPatrícia Machado Rodrigues e Silva
Aug 26, 2011·European Journal of Pharmacology·Vinicius F CarvalhoPatrícia M R E Silva
Jul 3, 2008·International Archives of Allergy and Immunology·Vinicius de F CarvalhoPatrícia M R e Silva
Jun 19, 2008·American Journal of Physiology. Endocrinology and Metabolism·Erica Patrícia Garcia-SouzaChristina Barja-Fidalgo

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