D-glucose metabolism in normal dispersed islet cells and tumoral INS-1 cells.

Abstract:

:The metabolism of D-glucose was characterized in both normal dispersed rat islet cells and the 2-mercaptoethanol-dependent insulin-secreting cells of the INS-1 line. The normal and tumoral islet cells differed from one another by the relative magnitude, concentration dependency and hierarchy of the increase in the production of 3HOH from D-[5-(3)H]glucose and 14C-labelled CO2, acidic metabolites and amino acids from D-[U-14C]glucose at increasing concentrations of the hexose. For instance, whilst the paired ratio between D-[U-14C]glucose oxidation and D-[5-(3)H]glucose utilization augmented in a typical sigmoidal manner in normal islet cells exposed to increasing concentrations of D-glucose, it progressively decreased under the same experimental conditions in INS-1 cells. Nevertheless, the absolute values and concentration-response relationship for the increase in ATP generation rate attributable to the catabolism of D-glucose were virtually identical in normal and tumoral cells. These findings indicate that the analogy in the secretory response to D-glucose of normal and INS-1 islet cells, although coinciding with a comparable response to the hexose in terms of ATP generation, contrasts with a vastly different pattern of D-glucose metabolism in these two cell types.

journal_name

Mol Cell Biochem

authors

Nadi AB,Olivares E,Malaisse WJ

doi

10.1023/a:1007106529644

keywords:

subject

Has Abstract

pub_date

2000-07-01 00:00:00

pages

167-72

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

210

pub_type

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