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

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 ma...

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Published in:Life sciences (1973) Vol. 79; no. 12; pp. 1194 - 1202
Main Authors: Barreto, Emiliano O., Carvalho, Vinícius F., Oliveira, Michelle S., Bertho, Álvaro L., Barja-Fidalgo, Thereza C., Cordeiro, Renato S.B., Martins, Marco A., e Silva, Patrícia M.R.
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Language:English
Published: Netherlands Elsevier Inc 15-08-2006
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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 PGD 2 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, the refractoriness of diabetic mast cells to antigen in vitro seems to be dependent on glucocorticoids.
AbstractList 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, the refractoriness of diabetic mast cells to antigen in vitro seems to be dependent on glucocorticoids.
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 PGD 2 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, the refractoriness of diabetic mast cells to antigen in vitro seems to be dependent on glucocorticoids.
Author Barja-Fidalgo, Thereza C.
Barreto, Emiliano O.
Carvalho, Vinícius F.
Martins, Marco A.
Oliveira, Michelle S.
Bertho, Álvaro L.
Cordeiro, Renato S.B.
e Silva, Patrícia M.R.
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  givenname: Vinícius F.
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  givenname: Michelle S.
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  fullname: Oliveira, Michelle S.
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  givenname: Álvaro L.
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  email: patmar@ioc.fiocruz.br
  organization: Laboratory of Inflammation, Department of Physiology and Pharmacodynamics, Brazil
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Issue 12
Keywords Mast cells
Diabetes
Glucocorticoids
Apoptosis
Actin microfilament
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Snippet Mast cell number and reactivity were shown to be down-regulated under diabetic conditions. Since the balance between globular and filamentous actin plays a...
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SubjectTerms Abortifacient Agents - pharmacology
Actin microfilament
Actins - metabolism
Actins - ultrastructure
Adrenalectomy
Animals
Antineoplastic Agents - pharmacology
Apoptosis
Apoptosis - physiology
bcl-2-Associated X Protein - metabolism
Blood Glucose - metabolism
Blotting, Western
Body Weight - drug effects
Cell Separation
Depsipeptides - pharmacology
Diabetes
Diabetes Mellitus, Experimental - metabolism
Diabetes Mellitus, Experimental - pathology
Flow Cytometry
Glucocorticoids
Glucocorticoids - physiology
Histamine Release - drug effects
Male
Mast cells
Mast Cells - physiology
Microscopy, Fluorescence
Mifepristone - pharmacology
Prostaglandin D2 - metabolism
Proto-Oncogene Proteins c-bcl-2 - metabolism
Rats
Rats, Wistar
Title High levels of filamentous actin and apoptosis correlate with mast cell refractoriness under alloxan-evoked diabetes
URI https://dx.doi.org/10.1016/j.lfs.2006.03.032
https://www.ncbi.nlm.nih.gov/pubmed/16647092
https://search.proquest.com/docview/68716557
Volume 79
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