The bradykinin B(1) receptor has been considered as a receptor induced by tissue injury and inflammation mainly in the peripheral tissues. In the present study, we have investigated whether there is a basal expression in the spinal cord by both reverse transcription-polymerase chain reaction (RT-PCR) and immunohistochemical staining methods. Southern blotting of the DNA reverse-transcribed from human and rat spinal cord mRNA and amplified by polymerase chain reaction (PCR) showed a substantial basal B(1) receptor expression in both human and rat spinal cord. Immunohistochemical staining demonstrated B(1)-positive neurons in the spinal cord dorsal horn, suggesting that the B(1) receptor is constitutively expressed by spinal neurons.
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Ma et al. (2001) studied this question.
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