Preliminary study on androgen dependence of calcitonin gene-related peptide in rat penis.
To study the androgen dependence of the neurotransmitter, calcitonin gene-related peptide (CGRP) in rat penis.


METHODS
Forty-four 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
1) 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); 2) There was no significant differences in area proportion of CGRP-PNF among Groups A, B and C 4 weeks after treatments (P >0.05); However, 10 weeks later, the proportion of CGRP-PNF in Groups B and C was significantly less than that in Group A (P <0.01); 3) The proportion of CGRP-PNF of 4-week animals in Groups B and C was significantly higher than that of 10-week animals (P <0.05).


CONCLUSIONS
The expression of neurotransmitter, CGRP may depend on androgens, including testosterone and DHT in rat penis.
Shen
Zhou-Jun
ZJ
Department of Urology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China. shenzj@zju.edu.cn
Chen
Shan-Wen
SW
Lu
Ying-Li
YL
Li
Liao-Yuan
LY
Zhou
Xie-Lai
XL
Zhang
Ming-Guang
MG
Chen
Zhao-Dian
ZD
D000728:Androgens / Q000378:metabolism*; D000818:Animals; D015740:Calcitonin Gene-Related Peptide / Q000378:metabolism*; D013196:Dihydrotestosterone / Q000097:blood; D005786:Gene Expression Regulation; D007150:Immunohistochemistry; D008297:Male; D010413:Penis / Q000378:metabolism*; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D013739:Testosterone / Q000097:blood
D000728:Androgens; D013196:Dihydrotestosterone; D013739:Testosterone; D015740:Calcitonin Gene-Related Peptide