| First Author | Fournier L | Year | 1993 |
| Journal | Am J Physiol | Volume | 264 |
| Issue | 6 Pt 1 | Pages | C1458-65 |
| PubMed ID | 8392795 | Mgi Jnum | J:12835 |
| Mgi Id | MGI:61053 | Doi | 10.1152/ajpcell.1993.264.6.C1458 |
| Citation | Fournier L, et al. (1993) K+ channel and alpha 2-adrenergic effects on glucose-induced Ca2+i surges: aberrant behavior in ob/ob mice. Am J Physiol 264(6 Pt 1):C1458-65 |
| abstractText | Glucose-induced shifts in intracellular free Ca2+ concentration ([Ca2+]i) were quantitatively and temporally the same in ob/ob and +/+ beta-cells. In both, epinephrine promptly and protractedly inhibited the glucose-induced [Ca2+]i surge via a pertussis toxin-sensitive alpha 2-adrenergic mechanism that was reversible by potassium depolarization. When added before glucose, epinephrine blocked completely in the ob/ob beta-cells, but in the +/+ beta-cells it produced a delayed, reduced, and transient intracellular Ca2+ (Ca2+i) surge. Neither the ATP-sensitive K+ channel blocker tolbutamide nor the large-conductance Ca(2+)-activated K+ channel (Kmaxi) blocker charybdotoxin reversed the effect of epinephrine. Tetraethylammonium (TEA), a blocker of both the Kmaxi and the delayed-rectifier K+ channel, and forskolin attenuated the effect of epinephrine in +/+ but not in the ob/ob beta-cells. The data show that 1) alpha 2-adrenoreceptor activation decreases the glucose-stimulated Ca2+i surge in +/+ beta-cells primarily by activating a tolbutamide- and charybdotoxin-insensitive, TEA- and forskolin-sensitive K+ channel; 2) the hypersecretion of insulin in ob/ob beta-cells is not due to enhanced glucose-induced Ca2+ influx; and 3) the ob/ob beta-cells are aberrant with regard to alpha 2-adrenergic modulation. |
