Effects of islet neogenesis-associated protein pentadecapeptide on cell mass and insulin secretion of pancreatic ß-cells.
J Endocrinol Invest
; 35(7): 634-9, 2012 Jul.
Article
em En
| MEDLINE
| ID: mdl-21945952
ABSTRACT
OBJECTIVE:
To explore the effects of islet neogenesis- associated protein pentadecapeptide (INGAP-PP) on proliferation and secretion function of ß-cells.METHODS:
Islets of adult Sprague Dawley rats were isolated by collagenase digestion and treated with 10 µg/ml INGAP-PP, after 12, 24, 48 h, glucose-stimulated insulin secretion (GSIS) and acridine orange/pro pidium iodide (AO/PI) staining were used to detect the secretion function and cell viability. The INS-1 cells were treated with 0, 1, 10, 25, 50, 100, 250, and 500 µg/ml INGAP-PP for 24 or 48 h, MTT cell proliferation assay was adopted to survey the dose-response relationship between INGAP-PP and cell proliferation. The mRNA expression of roliferating cell nuclear antigen (PCNA), Cyclin D1, Cdk4, P27, p38MAPK, and JNK in INS-1 cells were examined by RT-PCR, and the protein expression of PCNA was examined by Western blot. The statistical significance was determined by Student's t-test or one-way analysis of variance.RESULTS:
The insulin secreted by islets and the cell viability were increased by INGAP-PP. MTT indicated a dose-response relationship between INGAP-PP and quantity of INS-1 cells, and treatment for 48 h had a stronger effect on cell proliferation than the 24 h. INGAP-PP up-regulated the mRNA expression of PCNA, Cyclin D1, Cdk4 and downregulated P27, p38MAPK, and JNK. Moreover, the protein expression of PCNA was up-regulated by 45% after INGAPPP exposure for 48 h.CONCLUSIONS:
INGAP-PP increased the insulin secretion, enhanced the proliferation and might reduce apop tosis of ß-cells. The mechanism may contribute to the changed expression of some genes related to cell cycle.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fragmentos de Peptídeos
/
Ciclo Celular
/
Citocinas
/
Ilhotas Pancreáticas
/
Proteínas de Ciclo Celular
/
Células Secretoras de Insulina
/
Insulina
Tipo de estudo:
Risk_factors_studies
Limite:
Animals
Idioma:
En
Revista:
J Endocrinol Invest
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
China