Insulin expression in cultured astrocytes and the decrease by amyloid ß.
Neurochem Int
; 119: 171-177, 2018 10.
Article
en En
| MEDLINE
| ID: mdl-29108865
ABSTRACT
Insulin resistance in brain has been reported in Alzheimer's diseases (AD). Insulin signaling is important for homeostasis in brain function and reported to be disturbed in neurons leading to tau phosphorylation and neurofibrillary tangles. Many investigations of insulin in neurons have been reported; however, it has not been reported whether astrocytes also produce insulin. In the present study, we assessed the expression of insulin in astrocytes cultured from rat embryonic brain and the effects of amyloid ß1-42 (Aß) and lipopolysaccharide (LPS) on the expression. We found that astrocytes expressed preproinsulin mRNAs and insulin protein, and that Aß or LPS decreased these expressions. Antioxidants, glutathione and N-acetylcysteine, restored the decreases in insulin mRNA expression by Aß and by LPS. Insulin protein was detected in astrocyte conditioned medium. These results suggest that astrocytes express and secrete insulin. Oxidative stress might be involved in the decreased insulin expression by Aß or LPS. The insulin decrease by Aß in astrocytes could be a novel disturbing mechanism for brain insulin signaling in AD.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Contexto en salud:
1_ASSA2030
Problema de salud:
1_doencas_nao_transmissiveis
Asunto principal:
Astrocitos
/
Péptidos beta-Amiloides
/
Insulina
/
Antioxidantes
Límite:
Animals
Idioma:
En
Revista:
Neurochem Int
Año:
2018
Tipo del documento:
Article