Bolus administration of obestatin does not change glucose and insulin levels neither in the systemic nor in the portal circulation of the rat.

Abstract:

:Obestatin is a second peptide derived from the preproghrelin polypeptide. It was originally thought to have anorexigenic effects, thereby functioning as an antagonist of ghrelin. However, this has been a subject of debate ever since. Since acylated ghrelin strongly induces insulin resistance, it could be hypothesized that obestatin plays a role in glucose homeostasis as well. In the present study we evaluated the effect of obestatin on glucose and insulin metabolism in the systemic and portal circulation. Obestatin 200 nmol/kg was administered systemically as a single intravenous bolus injection to fasted pentobarbital anesthetized adult male Wistar rats. Up to 50 min after administration, blood samples were taken to measure glucose and insulin concentrations, both in the portal and in the systemic circulation. The effect of obestatin was evaluated in fasted and in glucose-stimulated conditions (IVGTT) and compared to control groups treated with saline or IVGTT, respectively. Intravenous administration of obestatin did not have any effect on glucose and insulin concentrations, neither systemic nor portal, when compared to the control groups. Only the glucose peak 1 min after administration of IVGTT was slightly higher in the obestatin treated rats: 605.8+/-106.3% vs. 522.2+/-47.1% in the portal circulation, respectively (NS), and 800.7+/-78.7% vs. 549.6+/-37.0% in the systemic circulation, respectively (P<0.02), but it can be debated whether this has any clinical relevance. In the present study, we demonstrated that intravenously administered obestatin does not influence glucose and insulin concentrations, neither in the portal nor in the systemic circulation.

journal_name

Peptides

journal_title

Peptides

authors

Kiewiet RM,Gauna C,van Aken MO,van de Zande B,van der Lely AJ

doi

10.1016/j.peptides.2008.09.011

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

2144-9

issue

12

eissn

0196-9781

issn

1873-5169

pii

S0196-9781(08)00403-8

journal_volume

29

pub_type

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