Preliminary study on androgen dependence of calcitonin gene-related peptide in rat penis
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What is calcitonin gene-related peptide and what role does it play? Read the following:
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ABSTRACT:
Aim:
To study the androgen dependence of the neurotransmitter, calcitonin gene-related peptide (CGRP) in rat penis.
Methods:
44 Sprague-Dawley rats were randomly divided into Group A (intact controls), Group B (castrated) and Group C (gavaged with finasteride 4.5 mg¡¤kg-1¡¤day-1).
Four and ten weeks later respectively, half of rats in each group were anaesthetized. Blood samples were taken for the measurement of serum testosterone and dihydrotestosterone (DHT) by means of radioimmunoassay.
Penile samples were harvested for the investigation of calcitonin gene related peptide (CGRP)-immunoreactive nerve fibers with immunohistochemistry.
The computer-assisted imaging analysis system was applied to calculate the area proportion of the CGRP-positive nerve fibers (CGRP-PNF) in each group.
Results:
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Both 4 and 10 weeks later, testosterone and DHT levels in Group B decreased significantly compared with those in Group A, (P<0.05, P<0.01, respectively); DHT level in Group C was also significantly decreased in comparison with that in Group A for both 4- and 10- week animals (P<0.05).
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There was no significant difference in area proportion of CGRP-PNF among Group A, B and C 4 weeks after treatments (P>0.05); However, 10 weeks later, the proportion of CGRP-PNF in Group B and C was significantly less than that in Group A (P<0.01).
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The proportion of CGRP-PNF of 4-week animals in Group B and C was significantly higher than that of 10-week animals (P<0.05).
Conclusion:
The expression of neorotransmitter, CGRP may depend on androgens, including testosterone and DHT in rat penis