Abstract
This study tests the hypothesis that insulin-like growth factor 1 (IGF- 1)-induced vasodilation is due to the stimulation of tyrosine phosphatase. Rat aortic segments (endothelium intact) were placed in muscle baths for force measurement. Segments were contracted to serotonin [5-hydroxytyptamine (5-HT), 10-7-10-5 M] before and after incubation with IGF-1 (10-100 nM; 90 min). IGF-1 caused a 20% inhibition of 5-HT-induced contractions. This inhibition was reversed by the tyrosine phosphatase inhibitors sodium orthovanadate and molybdate. Orthovanadate did not alter inhibitory properties of the calcium channel antagonist verapamil, suggesting that the phosphatase inhibitors were relatively specific. IGF-1-induced inhibition was not altered by blockade of nitric oxide synthase. Western blot analysis confirmed that the 5-HT-induced stimulation of tyrosine phosphorylation of the 42-kDa extracellular signal-regulated mitogen-activated protein kinase protein was reduced by IGF-1 (52% inhibition), an inhibition that was attenuated by orthovanadate. These data are consistent with the hypothesis that the vasodilator activity of IGF-1 is mediated by the activation of a tyrosine phosphatase. (C) 2000 Elsevier Science Inc.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 137-145 |
| Number of pages | 9 |
| Journal | General Pharmacology |
| Volume | 34 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 1 2000 |
| Externally published | Yes |
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Keywords
- Insulin-like growth factor
- Orthovanadate
- Rat aorta
- Tyrosine phosphatase
ASJC Scopus subject areas
- Pharmacology
Cite this
Insulin-like growth factor inhibits vascular contraction to 5- hydroxytryptamine : Involvement of tyrosine phosphatase. / Melis, Alessandra; Watts, Stephanie W.; Florian, Jennifer; Klarr, Susan; Webb, R Clinton.
In: General Pharmacology, Vol. 34, No. 2, 01.02.2000, p. 137-145.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Insulin-like growth factor inhibits vascular contraction to 5- hydroxytryptamine
T2 - Involvement of tyrosine phosphatase
AU - Melis, Alessandra
AU - Watts, Stephanie W.
AU - Florian, Jennifer
AU - Klarr, Susan
AU - Webb, R Clinton
PY - 2000/2/1
Y1 - 2000/2/1
N2 - This study tests the hypothesis that insulin-like growth factor 1 (IGF- 1)-induced vasodilation is due to the stimulation of tyrosine phosphatase. Rat aortic segments (endothelium intact) were placed in muscle baths for force measurement. Segments were contracted to serotonin [5-hydroxytyptamine (5-HT), 10-7-10-5 M] before and after incubation with IGF-1 (10-100 nM; 90 min). IGF-1 caused a 20% inhibition of 5-HT-induced contractions. This inhibition was reversed by the tyrosine phosphatase inhibitors sodium orthovanadate and molybdate. Orthovanadate did not alter inhibitory properties of the calcium channel antagonist verapamil, suggesting that the phosphatase inhibitors were relatively specific. IGF-1-induced inhibition was not altered by blockade of nitric oxide synthase. Western blot analysis confirmed that the 5-HT-induced stimulation of tyrosine phosphorylation of the 42-kDa extracellular signal-regulated mitogen-activated protein kinase protein was reduced by IGF-1 (52% inhibition), an inhibition that was attenuated by orthovanadate. These data are consistent with the hypothesis that the vasodilator activity of IGF-1 is mediated by the activation of a tyrosine phosphatase. (C) 2000 Elsevier Science Inc.
AB - This study tests the hypothesis that insulin-like growth factor 1 (IGF- 1)-induced vasodilation is due to the stimulation of tyrosine phosphatase. Rat aortic segments (endothelium intact) were placed in muscle baths for force measurement. Segments were contracted to serotonin [5-hydroxytyptamine (5-HT), 10-7-10-5 M] before and after incubation with IGF-1 (10-100 nM; 90 min). IGF-1 caused a 20% inhibition of 5-HT-induced contractions. This inhibition was reversed by the tyrosine phosphatase inhibitors sodium orthovanadate and molybdate. Orthovanadate did not alter inhibitory properties of the calcium channel antagonist verapamil, suggesting that the phosphatase inhibitors were relatively specific. IGF-1-induced inhibition was not altered by blockade of nitric oxide synthase. Western blot analysis confirmed that the 5-HT-induced stimulation of tyrosine phosphorylation of the 42-kDa extracellular signal-regulated mitogen-activated protein kinase protein was reduced by IGF-1 (52% inhibition), an inhibition that was attenuated by orthovanadate. These data are consistent with the hypothesis that the vasodilator activity of IGF-1 is mediated by the activation of a tyrosine phosphatase. (C) 2000 Elsevier Science Inc.
KW - Insulin-like growth factor
KW - Orthovanadate
KW - Rat aorta
KW - Tyrosine phosphatase
UR - http://www.scopus.com/inward/record.url?scp=0033839142&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033839142&partnerID=8YFLogxK
U2 - 10.1016/S0306-3623(00)00055-0
DO - 10.1016/S0306-3623(00)00055-0
M3 - Article
VL - 34
SP - 137
EP - 145
JO - Vascular Pharmacology
JF - Vascular Pharmacology
SN - 1537-1891
IS - 2
ER -