High dose of histone deacetylase inhibitors affects insulin secretory mechanism of pancreatic beta cell line

Objective. Histone deacytylase inhibitors (HDACis) inhibit the deacetylation of the lysine residue of proteins, including histones, and regulate the transcription of a variety of genes. Recently, HDACis have been used clinically as anti-cancer drugs and possible anti-diabetic drugs. Even though HDAC...

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Autor principal:	Yamato Eiji
Formato:	article
Lenguaje:	EN
Publicado:	Sciendo 2018
Materias:	trichostatin a histone deacytylase inhibitor beta cell line insulin Diseases of the endocrine glands. Clinical endocrinology RC648-665
Acceso en línea:	https://doaj.org/article/a1331ef46d6d46e983349cdeb35e1fdb
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spelling	oai:doaj.org-article:a1331ef46d6d46e983349cdeb35e1fdb2021-12-02T19:07:36ZHigh dose of histone deacetylase inhibitors affects insulin secretory mechanism of pancreatic beta cell line1336-032910.2478/enr-2018-0004https://doaj.org/article/a1331ef46d6d46e983349cdeb35e1fdb2018-01-01T00:00:00Zhttps://doi.org/10.2478/enr-2018-0004https://doaj.org/toc/1336-0329Objective. Histone deacytylase inhibitors (HDACis) inhibit the deacetylation of the lysine residue of proteins, including histones, and regulate the transcription of a variety of genes. Recently, HDACis have been used clinically as anti-cancer drugs and possible anti-diabetic drugs. Even though HDACis have been proven to protect the cytokine-induced damage of pancreatic beta cells, evidence also shows that high doses of HDACis are cytotoxic. In the present study, we, therefore, investigated the eff ect of HDACis on insulin secretion in a pancreatic beta cell line. Methods. Pancreatic beta cells MIN6 were treated with selected HDACis (trichostatin A, TSA; valproic acid, VPA; and sodium butyrate, NaB) in medium supplemented with 25 mM glucose and 13% heat-inactivated fetal bovine serum (FBS) for indicated time intervals. Protein expression of Pdx1 and Mafa in MIN6 cells was demonstrated by immunohistochemistry and immunocytochemistry, expression of Pdx1 and Mafa genes was measured by quantitative RT-PCR method. Insulin release from MIN6 cells and insulin cell content were estimated by ELISA kit. Superoxide production in MIN6 cells was measured using a Total ROS/Superoxide Detection System. Results. TSA, VPA, and NaB inhibited the expression of Pdx1 and Mafa genes and their products. TSA treatment led to beta cell malfunction, characterized by enhanced insulin secretion at 3 and 9 mM glucose, but impaired insulin secretion at 15 and 25 mM glucose. Th us, TSA induced dysregulation of the insulin secretion mechanism. TSA also enhanced reactive oxygen species production in pancreatic beta cells. Conclusions. Our results showed that HDACis caused failure to suppress insulin secretion at low glucose concentrations and enhance insulin secretion at high glucose concentrations. In other words, when these HDACis are used clinically, high doses of HDACis may cause hypoglycemia in the fasting state and hyperglycemia in the fed state. When using HDACis, physicians should, therefore, be aware of the capacity of these drugs to modulate the insulin secretory capacity of pancreatic beta cells.Yamato EijiSciendoarticletrichostatin ahistone deacytylase inhibitorbeta cell lineinsulinDiseases of the endocrine glands. Clinical endocrinologyRC648-665ENEndocrine Regulations, Vol 52, Iss 1, Pp 21-26 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	trichostatin a histone deacytylase inhibitor beta cell line insulin Diseases of the endocrine glands. Clinical endocrinology RC648-665
spellingShingle	trichostatin a histone deacytylase inhibitor beta cell line insulin Diseases of the endocrine glands. Clinical endocrinology RC648-665 Yamato Eiji High dose of histone deacetylase inhibitors affects insulin secretory mechanism of pancreatic beta cell line
description	Objective. Histone deacytylase inhibitors (HDACis) inhibit the deacetylation of the lysine residue of proteins, including histones, and regulate the transcription of a variety of genes. Recently, HDACis have been used clinically as anti-cancer drugs and possible anti-diabetic drugs. Even though HDACis have been proven to protect the cytokine-induced damage of pancreatic beta cells, evidence also shows that high doses of HDACis are cytotoxic. In the present study, we, therefore, investigated the eff ect of HDACis on insulin secretion in a pancreatic beta cell line. Methods. Pancreatic beta cells MIN6 were treated with selected HDACis (trichostatin A, TSA; valproic acid, VPA; and sodium butyrate, NaB) in medium supplemented with 25 mM glucose and 13% heat-inactivated fetal bovine serum (FBS) for indicated time intervals. Protein expression of Pdx1 and Mafa in MIN6 cells was demonstrated by immunohistochemistry and immunocytochemistry, expression of Pdx1 and Mafa genes was measured by quantitative RT-PCR method. Insulin release from MIN6 cells and insulin cell content were estimated by ELISA kit. Superoxide production in MIN6 cells was measured using a Total ROS/Superoxide Detection System. Results. TSA, VPA, and NaB inhibited the expression of Pdx1 and Mafa genes and their products. TSA treatment led to beta cell malfunction, characterized by enhanced insulin secretion at 3 and 9 mM glucose, but impaired insulin secretion at 15 and 25 mM glucose. Th us, TSA induced dysregulation of the insulin secretion mechanism. TSA also enhanced reactive oxygen species production in pancreatic beta cells. Conclusions. Our results showed that HDACis caused failure to suppress insulin secretion at low glucose concentrations and enhance insulin secretion at high glucose concentrations. In other words, when these HDACis are used clinically, high doses of HDACis may cause hypoglycemia in the fasting state and hyperglycemia in the fed state. When using HDACis, physicians should, therefore, be aware of the capacity of these drugs to modulate the insulin secretory capacity of pancreatic beta cells.
format	article
author	Yamato Eiji
author_facet	Yamato Eiji
author_sort	Yamato Eiji
title	High dose of histone deacetylase inhibitors affects insulin secretory mechanism of pancreatic beta cell line
title_short	High dose of histone deacetylase inhibitors affects insulin secretory mechanism of pancreatic beta cell line
title_full	High dose of histone deacetylase inhibitors affects insulin secretory mechanism of pancreatic beta cell line
title_fullStr	High dose of histone deacetylase inhibitors affects insulin secretory mechanism of pancreatic beta cell line
title_full_unstemmed	High dose of histone deacetylase inhibitors affects insulin secretory mechanism of pancreatic beta cell line
title_sort	high dose of histone deacetylase inhibitors affects insulin secretory mechanism of pancreatic beta cell line
publisher	Sciendo
publishDate	2018
url	https://doaj.org/article/a1331ef46d6d46e983349cdeb35e1fdb
work_keys_str_mv	AT yamatoeiji highdoseofhistonedeacetylaseinhibitorsaffectsinsulinsecretorymechanismofpancreaticbetacellline
_version_	1718377168098033664

High dose of histone deacetylase inhibitors affects insulin secretory mechanism of pancreatic beta cell line

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