Expression and cell-specific localization of cholecystokinin receptors in rat lung.
AIM: To elucidate whether CCK receptors exist in lung tissues and their precise cellular localization in the lung. METHODS: CCK-AR and CCK-BR mRNA expression and cellular distribution in the rat lung were detected by highly sensitive method of in situ reverse transcription-polymerase chain reaction (RT-PCR) and conventional in situ hybridization. RESULTS: CCK-AR and CCK-BR gene positive signals were observed in bronchial epithelial cells, alveolar epithelial cells, pulmonary macrophages and vascular endothelial cells of the rats' lung by in situ RT-PCR. The hybridization signals of CCK-AR were relatively faint. By in situ hybridization, however, only the signals of CCK-BR but not CCK-AR were detected in the lung, and the positive staining was only found in vascular endothelial cells and macrophages. CONCLUSION: CCK-AR and CCK-BR gene were present in pulmonary vascular endothelial cells, macrophages, bronchial epithelial cells and alveolar epithelial cells, which play an important role in mediating the regulatory actions of CCK-8 on these cells.[1]References
- Expression and cell-specific localization of cholecystokinin receptors in rat lung. Cong, B., Li, S.J., Ling, Y.L., Yao, Y.X., Gu, Z.Y., Wang, J.X., You, H.Y. World J. Gastroenterol. (2003) [Pubmed]
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