目的：了解Ｗｉｓｔａｒ－Ｋｙｏｔｏ大鼠（Ｗｉｓｔａｒ－Ｋｙｏｔｏｒａｔｓ，ＷＫＹ）、自发性高血压大鼠（Ｓｐｏｎｔａｎｅｏｕｓｌｙｈｙｐｅｒｔｅｎｓｉｖｅｒａｔｓ，ＳＨＲ）血管平滑肌细胞（Ｖａｓｃｕｌａｒｓｍｏｏｔｈｍｕｓｃｌｅｃｅｌｓ，ＶＳＭＣ）上神经肽Ｙ（ＮｅｕｒｏｐｅｐｔｉｄｅＹ，ＮＰＹ）受体的表达水平及其差异。方法：应用Ｉｏｄｏｇｅｎ法对ＮＰＹ受体进行了测定。结果：ＮＰＹ蛋白质标记率为７０％，比活度为３．３６ＭＢｑ／μｇＶＳＭＣ在（１．０～５．０）×１０６细胞／ｍｌ的范围内，１２５Ｉ－ＮＰＹ的特异性结合量与ＶＳＭＣ细胞数之间呈线性关系；ＳＨＲ的ＮＰＹ受体最大结合量（Ｂｍａｘ）和受体复合物解离常数（Ｋｄ）均明显高于ＷＫＹ，相关分析显示Ｂｍａｘ，Ｋｄ与血压增高程度呈正相关。结论：ＮＰＹ受体数目和亲和力的增加可能在高血压的发病机制中占有重要的地位 Objective: To investigate the expression of neuropeptide Y (NPY) receptor on Wistar-Kyoto rats (WKY) and spontaously hypertensive rats (SHR) The difference. Methods: The NPY receptor was determined by Iodogen method. Results: NPY protein labeling rate was 70%, specific activity was 3.36MBq / μg VSMC in the range of (1.0 ~ 5.0) × 106 cells / ml, the specific binding of125I-NPY and VSMC cells (Bmax) and receptor complex dissociation constant (Kd) of SHR were significantly higher than those of WKY. The correlation analysis showed that Bmax and Kd were positively correlated with the increase of blood pressure. Conclusions: Increased NPY receptor numbers and affinities may play an important role in the pathogenesis of hypertension