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Impaired KATP channel function in the fetoplacental circulation of patients with type 1 diabetes mellitus.

Abstract：

OBJECTIVE:The increased perinatal morbidity in diabetes may be partly related to vascular dysfunction. Because potassium channels play an important role in the regulation of vascular tone, this study explores the impact of diabetes on potassium channel function in the fetoplacental vascular bed. STUDY DESIGN:Vascular potassium channel function was investigated by ex vivo dual perfusion of isolated placental cotyledons (n = 47). Appropriate control experiments were carried out to exclude nonspecific effects. RESULTS:Glibenclamide (KATP channel blocker) increased perfusion pressure to a maximum fetoplacental arterial pressure of 37 +/- 6 mm Hg in controls versus 15 +/- 6 mm Hg in diabetes (P < .05). 4-Aminopyridine (KV channel blocker) equally increased fetoplacental arterial pressure in controls, and in diabetes (21 +/- 4 mm Hg vs 22 +/- 2 mm Hg). Apamin and charybdotoxin (KCa channel blockers) caused a negligible rise in fetoplacental arterial pressure. CONCLUSION:In the fetoplacental circulation, KATP channels and KV channels significantly contribute to baseline vascular tone. In diabetes, vascular KATP channel function is impaired.

journal_name

Am J Obstet Gynecol

journal_title

American journal of obstetrics and gynecology

authors

Bisseling TM,Versteegen MG,van der Wal S,Copius Peereboom-Stegeman JJ,Borggreven JM,Steegers EA,van der Laak JA,Russel FG,Smits P

doi

10.1016/j.ajog.2004.09.031

subject

Has Abstract

pub_date

2005-03-01 00:00:00

pages

973-9

issue

3

eissn

0002-9378

issn

1097-6868

pii

S0002937804010518

journal_volume

192

pub_type

杂志文章

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