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Vasopressin induced cyclooxygenase dependent superoxide generation contributes to K(+) channel function impairment after brain injury.

Abstract：

:This study determined if vasopressin generates superoxide anion (O2(-)) in a cyclooxygenase dependent manner and if such production contributes to impairment of dilation to activators of ATP sensitive K(+) (K(ATP)) and calcium sensitive K(+) (K(ca)) channels following fluid percussion brain injury (FPI) in newborn pigs equipped with closed cranial windows. Superoxide dismutase (SOD) inhibitable nitroblue tetrazolium (NBT) reduction was determined as an index of O2(-) generation. Under non-brain injury conditions, topical vasopressin (40 pg/ml, the concentration present in CSF following FPI) increased SOD inhibitable NBT reduction from 1+/-1 to 25+/-4 pmol/mm(2). Indomethacin, a cyclooxygenase inhibitor, blunted such NBT reduction (1+/-1 to 5+/-1 pmol/mm(2)), while the vasopressin antagonist, l-(beta-mercapto-beta beta-cyclopentamethylene propionic acid) 2-(o-methyl)-Tyr-AVP (MEAVP) blocked NBT reduction. MEAVP and indomethacin also blunted the NBT reduction observed after FPI. Under non-brain injury conditions, vasopressin (40 pg/ml) coadministered with the K(ATP) and K(ca) channel agonists, cromakalim and NS1619 (10(-8), 10(-6) M) diminished dilation to these K(+) channel agonists while indomethacin partially prevented such impairment (13+/-1 and 23+/-1 vs. 4+/-1 and 10+/-2 vs. 8+/-1 and 19+/-1% for cromakalim in untreated, vasopressin, and vasopressin plus indomethacin treated piglets, respectively). Cromakalim and NS1619 induced pial artery dilation was attenuated following FPI, while indomethacin or MEAVP preadministration partially prevented such impairment (13+/-1 and 23+/-1, sham control; 1+/-1 and 4+/-1, FPI; 8+/-1 and 16+/-3%, FPI-indomethacin pretreated for responses to cromakalim 10(-8), 10(-6) M, respectively). These data show that vasopressin increased O2(-) production in a cyclooxygenase dependent manner and contributed to this production after FPI. These data also show that vasopressin blunted K(ATP) and K(ca) channel mediated cerebrovasodilation in a cyclooxygenase dependent manner. These data suggest that vasopressin induced cyclooxygenase dependent O2(-) generation contributes to K(ATP) and K(ca) channel function impairment after FPI.

journal_name

Brain Res

journal_title

Brain research

authors

Armstead WM

doi

10.1016/s0006-8993(01)02716-0

subject

Has Abstract

pub_date

2001-08-10 00:00:00

pages

19-28

issue

1-2

eissn

0006-8993

issn

1872-6240

pii

S0006-8993(01)02716-0

journal_volume

910

pub_type

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