Localization of constitutive isoforms of nitric oxide synthase in the gastric glandular mucosa of the rat

被引:56
作者
Price, KJ
Hanson, PJ
Whittle, BJR
机构
[1] ASTON UNIV,INST PHARMACEUT SCI,BIRMINGHAM B4 7ET,W MIDLANDS,ENGLAND
[2] WELLCOME RES LABS,BECKENHAM BR3 3BS,KENT,ENGLAND
关键词
nitric oxide; nitric oxide synthase; gastric mucosa; stomach; immunohistochemistry; rat (Wistar);
D O I
10.1007/s004410050631
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Nitric oxide has been implicated in the regulation of blood flow, mucosal integrity and mucus secretion in the gastric mucosa. An antiserum directed against the C-terminal hexadecapeptide of rat brain nitric oxide synthase (NOS) and monoclonal antibodies to the neuronal and endothelial forms of NOS were used to establish the location of isoforms of NOS in rat gastric glandular mucosa. Antibodies to the neuronal form of NOS reacted with a band of 160 kDa on immunoblots of brain and gastric mucosa, and the addition of the hexadecapeptide inhibited recognition by the antipeptide antiserum. The antibody to endothelial NOS detected a band of 140 kDa on protein blots of samples of intestinal mesentery and gastric mucosa. Immunohistochemistry using these antibodies demonstrated that material related to neuronal NOS was present in surface cells of the gastric mucosa, and showed a similar localization to intense NADPH diaphorase activity. The antibody to endothelial NOS did not stain the surface of the gastric mucosa but recognized blood vessels in the lower region of the gastric glands and in the sub-mucosa. This study suggests that nitric oxide might act both as an intra- and inter-cellular messenger to regulate mucus release, and that the NOS present in surface cells is related more closely to the neuronal than to the endothelial isoform.
引用
收藏
页码:157 / 163
页数:7
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