Interleukin 1 is potent modulator of insulin secretion from isolated rat islets of Langerhans.
The effects of interleukin 1 (IL-1) on glucose-induced insulin secretion from isolated rat islets of Langerhans have been examined. IL-1 both inhibits and stimulates glucose-induced insulin secretion depending on the experimental design. Inhibition of glucose-induced insulin secretion was observed after a 15-h treatment of islets with either purified IL-1, murine recombinant IL-1 (rIL-1), or human rIL-1, rIL-1 inhibition of glucose-induced insulin secretion was dose dependent with half-maximal inhibition observed at 25 pM human rIL-1. Basal insulin secretion was not affected by rIL-1 treatment. Mannose- and leucine-induced insulin secretion was also inhibited by a 15-h treatment with human rIL-1. Islets treated 15 h with inhibitory concentrations of murine IL-1 were morphologically intact, well granulated, and retained normal concentrations of insulin compared with control islets. Furthermore, human rIL-1 treatment did not affect the islet plasma membrane permeability as assessed by the measurement of the islet intracellular volume. Finally, the viability of islets treated 15 h with murine rIL-1 was demonstrated by the observation that the inhibitory effects of murine rIL-1 on glucose-induced insulin secretion were reversible. In addition to the inhibitory effects of IL-1 on glucose-induced insulin secretion, purified IL-1 and human rIL-1 had stimulatory effects on glucose-induced insulin secretion under the following conditions: a 90-min incubation with purified IL-1 (10% vol/vol) or in the presence of human rIL-1 (1400 pM) or a 15-h incubation with relatively low concentrations of human rIL-1 (0.5 or 5 pM).(ABSTRACT TRUNCATED AT 250 WORDS)
Comens
P G
PG
Wolf
B A
BA
Unanue
E R
ER
Lacy
P E
PE
McDaniel
M L
ML
D000818:Animals; D005947:Glucose / Q000494:pharmacology; D066298:In Vitro Techniques; D007328:Insulin / Q000378:metabolism*; D000078790:Insulin Secretion; D007375:Interleukin-1 / Q000494:pharmacology / Q000502:physiology*; D007515:Islets of Langerhans / Q000033:anatomy & histology / Q000187:drug effects / Q000378:metabolism*; D007930:Leucine / Q000494:pharmacology; D008297:Male; D008358:Mannose / Q000494:pharmacology; D010539:Permeability; D051381:Rats; D011919:Rats, Inbred Strains; D011994:Recombinant Proteins / Q000494:pharmacology; D013997:Time Factors
D007328:Insulin; D007375:Interleukin-1; D011994:Recombinant Proteins; D007930:Leucine; D005947:Glucose; D008358:Mannose