Trichostatin A affects the secretion pathways of beta and intestinal endocrine cells

Exp Cell Res. 2015 Jan 1;330(1):212-21. doi: 10.1016/j.yexcr.2014.09.031. Epub 2014 Oct 16.

Abstract

Histone deacetylase inhibitors (HDACi) were recently identified as having significant clinical potential in reversing β-cell functional inhibition caused by inflammation, a shared precursor of Type 1 and Type 2 diabetes. However, HDACi are highly complex and little is known of their direct effect on important cell secretion pathways for blood glucose regulation. The aims of the present study were to investigate the effect of HDACi on insulin secretion from β-cells, GLP-1 secretion from L-cells, and recombinant insulin secretion from engineered L-cells. The β-cell line βTC-tet, L-cell line GLUTag, or recombinant insulin-secreting L-cell lines were exposed to Trichostatin A for 24h. Effects on insulin or GLP-1 mRNA, intracellular protein content, processing efficiency, and secretion were measured by real-time PCR, ELISA, and radioimmunoassay. HDACi increased secretion per viable cell in a dose-dependent manner for all cell types. Effects on mRNA levels were variable, but enhanced intracellular polypeptide content and secretion were comparable among cell types. Enhanced recombinant insulin secretion was sustained for seven days in alginate microencapsulated L-cells. HDACi enhances β- and L-cell secretion fluxes in a way that could significantly improve blood glucose regulation in diabetes patients and holds potential as a novel method for enhancing insulin-secreting non-β or β-cell grafts.

Keywords: Diabetes; Histone deacetylase inhibitors; Intestinal endocrine cells; Regulated secretory pathway; Trichostatin A; β-cells.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Cell Line
  • Enteroendocrine Cells / drug effects*
  • Enteroendocrine Cells / metabolism
  • Glucagon-Like Peptide 1 / genetics
  • Glucagon-Like Peptide 1 / metabolism
  • Histone Deacetylase Inhibitors / pharmacology*
  • Hydroxamic Acids / pharmacology*
  • Insulin / genetics
  • Insulin / metabolism
  • Insulin-Secreting Cells / drug effects*
  • Insulin-Secreting Cells / metabolism
  • Mice
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • Secretory Pathway*

Substances

  • Histone Deacetylase Inhibitors
  • Hydroxamic Acids
  • Insulin
  • RNA, Messenger
  • trichostatin A
  • Glucagon-Like Peptide 1