Fm. Koehn et al., CONCENTRATIONS OF VASOACTIVE INTESTINAL POLYPEPTIDE IN CORPUS CAVERNOSUM AND PERIPHERAL VENOUS-BLOOD DURING PROSTAGLANDIN E(1)-INDUCED ERECTION, Archives of andrology, 31(3), 1993, pp. 217-222
Vasoactive intestinal polypeptide (VIP) hits been suggested to play a
role as a nonadrenergic, noncholinergic neurotransmitter or neuromodul
ator involved in the process of erection. Until now, data about fluctu
ating concentrations of VIP in corpus cavernosum (CC) blood have been
controversial. The present study describes a modified radioimmunoassay
method that was developed in our laboratory for the determination of
VIP in plasma. Examination of 12 patients suffering from impotentia co
eundi (6 men with psychogenic impotence, 2 with induratio penis plasti
ca, and 4 with impotence of vascular origin) showed that the concentra
tions of VIP in corpus cavernosum blood during pharmacologically induc
ed erection did not increase in organically healthy men or in men with
impotentia coeundi of vascular origin. The VIP concentrations in peri
pheral venous blood and those in CC blood were similar.