Tyrosine kinase involvement in apamin‐sensitive inhibitory responses of rat distal colon
Tyrosine kinase involvement in apamin‐sensitive inhibitory responses of rat distal colon
复制标题
酪氨酸激酶参与大鼠远端结肠的 apamin 敏感抑制反应
DOI:
--
复制
发表时间:
1999
期刊:
影响因子:
--
通讯作者:
T. Takewaki
中科院分区:
文献类型:
--
作者:
T. Takeuchi;M. Kishi;N. Hirayama;M. Yamaji;T. Ishii;H. Nishio;F. Hata;T. Takewaki
1 It has been suggested that pituitary adenylate cyclase activating peptide (PACAP) may be involved in the non‐adrenergic, non‐cholinergic (NANC) inhibitory response of longitudinal muscle of rat distal colon. In this study, we have investigated the intracellular mechanism of PACAP‐induced relaxation in this muscle. 2 PACAP induced an apamin‐sensitive relaxation of the longitudinal muscle. The tyrosine kinase inhibitors genistein at 10 μm and tyrphostin 25 at 30 μm, but not the cyclic AMP‐dependent protein kinase inhibitor Rp‐8‐bromoadenosine‐3′,5′‐cyclic monophosphorothioate at 30 μm significantly inhibited the PACAP‐induced relaxation to 60% and 25% of control values, respectively. PACAP did not increase the cyclic AMP content of the muscle. 3 Tyrphostin 25 at 10 μm significantly inhibited the relaxation of longitudinal muscle induced by electrical field stimulation (EFS), to 50% of control values. Apamin at 1 μm, an antagonist of small conductance Ca2+‐activated K+ channels, also inhibited the relaxation, to 42% of control values. The inhibitory effects of tyrphostin 25 and apamin were not additive (44% of control values). 4 PACAP induced an apamin‐sensitive, slow hyperpolarization of the cell membrane of the muscle. Tyrphostin 25 at 3 μm inhibited this PACAP‐induced hyperpolarization. Tyrphostin 25 at 10 μm and genistein at 10 μm inhibited the apamin‐sensitive inhibitory junction potentials induced by a single pulse of EFS. 5 The PACAP‐induced relaxation of longitudinal muscle occurred with a concomitant decrease in intracellular Ca2+ levels ([Ca2+]i). Tyrphostin 25 at 10 μm and apamin at 1 μm abolished these PACAP‐induced responses. 6 From these findings it is suggested that the activation of tyrosine kinase is involved in PACAP‐induced relaxation of longitudinal muscle from rat distal colon, ‘upstream of’ the activation of apamin‐sensitive K+ channels.
登录
查看更多内容
DOI:
10.1073/pnas.91.16.7583
发表时间:
1994-08-02
影响因子:
11.1
作者:
ARCHER, SL;HUANG, JMC;WEIR, EK
通讯作者:
WEIR, EK
DOI:
10.1152/ajpcell.1991.261.2.c387
发表时间:
1991
期刊:
The American journal of physiology
影响因子:
--
作者:
Carl,A;Kenyon,JL;Uemura,D;Fusetani,N;Sanders,KM
通讯作者:
Sanders,KM
DOI:
10.1152/ajpcell.1994.266.5.c1459
发表时间:
1994
期刊:
The American journal of physiology
影响因子:
--
作者:
Perez,G;Toro,L
通讯作者:
Toro,L
DOI:
10.1016/0006-291x(89)91757-9
发表时间:
1989-10-16
影响因子:
3.1
作者:
MIYATA, A;ARIMURA, A;COY, DH
通讯作者:
COY, DH
DOI:
10.1152/ajpgi.1997.272.6.g1391
发表时间:
1997-06-01
影响因子:
4.5
作者:
Murthy, KS;Jin, JG;Makhlouf, GM
通讯作者:
Makhlouf, GM