Alphav-integrin utilization in human beta-cell adhesion, spreading, and motility

The role of individual integrins in human beta-cell development and function is largely unknown. This study describes the contribution of alpha(v)-integrins to human beta-cell adhesion, spreading, and motility. Developmental differences in alpha(v)-integrin utilization are addressed by comparing the...

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Bibliographic Details
Published in:The Journal of biological chemistry 2004-04, Vol.279 (17), p.17731-17737
Main Authors: Kaido, Thomas, Perez, Brandon, Yebra, Mayra, Hill, Jesse, Cirulli, Vincenzo, Hayek, Alberto, Montgomery, Anthony M
Format: Article
Language:English
Subjects:
Adult
Aged
Blotting, Western
Cadaver
Cell Adhesion
Cell Line
Cell Movement
Collagenases - metabolism
Down-Regulation
Flow Cytometry
Gene Expression Regulation, Developmental
Humans
Integrin alphaV - metabolism
Integrin alphaV - physiology
Integrins - metabolism
Islets of Langerhans - cytology
Microscopy, Fluorescence
Middle Aged
Pancreas - cytology
Pancreas - embryology
Precipitin Tests
Protein Binding
Receptors, Vitronectin - metabolism
Time Factors
Vitronectin - metabolism
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Summary:The role of individual integrins in human beta-cell development and function is largely unknown. This study describes the contribution of alpha(v)-integrins to human beta-cell adhesion, spreading, and motility. Developmental differences in alpha(v)-integrin utilization are addressed by comparing the responses of adult and fetal beta-cells, and vitronectin is used as a substrate based on its unique pattern of expression in the developing pancreas. Fetal and adult beta-cells attached equally to vitronectin and integrin alpha(v)beta(5) was found to support the adhesion of both mature and immature beta-cell populations. Fetal beta-cells were also observed to spread and migrate on vitronectin, and integrin alpha(v)beta(1) was found to be essential for these responses. In contrast to their fetal counterparts, adult beta-cells failed to either spread or migrate and this deficit was associated with a marked down-regulation of alpha(v)beta(1) expression in adult islet preparations. The integrin alpha(v)beta(3) was not found to support significant beta-cell attachment or migration. Based on our findings, we conclude that integrins alpha(v)beta(5) and alpha(v)beta(1) are important mediators of human beta-cell adhesion and motility, respectively. By supporting fetal beta-cell migration, alpha(v)beta(1) could play an important role in early motile processes required for islet neogenesis.
ISSN:0021-9258