Abstract
Although a number of studies have investigated the effect of cholecystokinin (CCK) on pancreatic blood flow and exocrine function, few have addressed the effect of CCK on islet blood flow. Here, we studied the effect of exogenous CCK on islet blood flow in anesthetized rats. Islet blood flow was measured by the color microsphere method. Bolus intravenous administration of CCK (10 μg/kg) significantly increased pancreatic and islet blood flow in control Long-Evans Tokushima Otsuka (LETO) rats, but not in Otsuka Long-Evans Tokushima Fatty (OLETF) rats lacking CCK-A receptors. Since fractional islet blood flow expressed as a percentage of whole pancreatic blood flow was decreased after CCK administration in LETO rats, the vasodilating effect of CCK appeared to be stronger in exocrine than endocrine tissue. Although vagotomy failed to alter the CCK-induced increase in pancreatic and islet blood flow, pretreatment with nitric oxide synthase inhibitor NG-monomethyl-L- arginine completely prevented the increase in pancreatic and islet blood flow. Our results demonstrated that exogenous CCK is a potent vasodilator of exocrine as well as islet vasculature via CCK-A receptors, and that such action is mediated by a NO-dependent mechanism rather than by vagal mechanisms.
| Original language | English |
|---|---|
| Pages (from-to) | 87-93 |
| Number of pages | 7 |
| Journal | Regulatory Peptides |
| Volume | 116 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - Nov 15 2003 |
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All Science Journal Classification (ASJC) codes
- Biochemistry
- Physiology
- Endocrinology
- Clinical Biochemistry
- Cellular and Molecular Neuroscience
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Effect of exogenous cholecystokinin on islet blood flow in anesthetized rats. / Iwase, Masanori; Uchizono, Yuji; Nakamura, Udai; Nohara, Sakae; Iida, Mitsuo.
In: Regulatory Peptides, Vol. 116, No. 1-3, 15.11.2003, p. 87-93.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of exogenous cholecystokinin on islet blood flow in anesthetized rats
AU - Iwase, Masanori
AU - Uchizono, Yuji
AU - Nakamura, Udai
AU - Nohara, Sakae
AU - Iida, Mitsuo
PY - 2003/11/15
Y1 - 2003/11/15
N2 - Although a number of studies have investigated the effect of cholecystokinin (CCK) on pancreatic blood flow and exocrine function, few have addressed the effect of CCK on islet blood flow. Here, we studied the effect of exogenous CCK on islet blood flow in anesthetized rats. Islet blood flow was measured by the color microsphere method. Bolus intravenous administration of CCK (10 μg/kg) significantly increased pancreatic and islet blood flow in control Long-Evans Tokushima Otsuka (LETO) rats, but not in Otsuka Long-Evans Tokushima Fatty (OLETF) rats lacking CCK-A receptors. Since fractional islet blood flow expressed as a percentage of whole pancreatic blood flow was decreased after CCK administration in LETO rats, the vasodilating effect of CCK appeared to be stronger in exocrine than endocrine tissue. Although vagotomy failed to alter the CCK-induced increase in pancreatic and islet blood flow, pretreatment with nitric oxide synthase inhibitor NG-monomethyl-L- arginine completely prevented the increase in pancreatic and islet blood flow. Our results demonstrated that exogenous CCK is a potent vasodilator of exocrine as well as islet vasculature via CCK-A receptors, and that such action is mediated by a NO-dependent mechanism rather than by vagal mechanisms.
AB - Although a number of studies have investigated the effect of cholecystokinin (CCK) on pancreatic blood flow and exocrine function, few have addressed the effect of CCK on islet blood flow. Here, we studied the effect of exogenous CCK on islet blood flow in anesthetized rats. Islet blood flow was measured by the color microsphere method. Bolus intravenous administration of CCK (10 μg/kg) significantly increased pancreatic and islet blood flow in control Long-Evans Tokushima Otsuka (LETO) rats, but not in Otsuka Long-Evans Tokushima Fatty (OLETF) rats lacking CCK-A receptors. Since fractional islet blood flow expressed as a percentage of whole pancreatic blood flow was decreased after CCK administration in LETO rats, the vasodilating effect of CCK appeared to be stronger in exocrine than endocrine tissue. Although vagotomy failed to alter the CCK-induced increase in pancreatic and islet blood flow, pretreatment with nitric oxide synthase inhibitor NG-monomethyl-L- arginine completely prevented the increase in pancreatic and islet blood flow. Our results demonstrated that exogenous CCK is a potent vasodilator of exocrine as well as islet vasculature via CCK-A receptors, and that such action is mediated by a NO-dependent mechanism rather than by vagal mechanisms.
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UR - http://www.scopus.com/inward/citedby.url?scp=0242266547&partnerID=8YFLogxK
U2 - 10.1016/j.regpep.2003.07.002
DO - 10.1016/j.regpep.2003.07.002
M3 - Article
VL - 116
SP - 87
EP - 93
JO - Regulatory Peptides
JF - Regulatory Peptides
SN - 0167-0115
IS - 1-3
ER -