Document Detail


Effect of apomorphine on intracavernous pressure and blood pressure in conscious, spinalized rats.
MedLine Citation:
PMID:  11979329     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Apomorphine, given subcutaneously (s.c.), induces erection and bladder overactivity in rats through stimulation of dopamine (D1- and D2-like) receptors in the central nervous system. In paraplegic patients, apomorphine was reported to cause bladder overactivity. This suggests that apomorphine may have a spinal site of action also for stimulation of erection. The present study was initiated to evaluate the effect of apomorphine on erectile function in spinalized rats. Apomorphine (100 microg/kg, s.c.) was given to awake, unrestrained male Sprague-Dawley rats (300 g) with or without spinal cord injury, made at the Th 8 level 2 weeks before the experiment. Intracavernous pressure changes from baseline were evaluated as time to first response to apomorphine (TFR; sec), number of phasic pressure changes in the first 30 min (PP30), duration (D; sec) of the phasic pressure changes, the amount of increase in tonic peak pressure (TPP; cmH2O), and burst peak pressure (BPP; cmH2O). Blood pressure (cmH2O) was recorded via an intra-arterial catheter. Apomorphine, 100 microg/kg, caused no significant differences in TFR (217.8 vs 271.2), PP30 (6.4 vs 6.5), D (38.9 vs 37.6.), TPP (51.0 vs 54.0) and BPP (128.9 vs 160.4) between normal (n=8) and spinalized rats (n=6). However, blood pressure decreased significantly more in spinalized than in normal animals (17.7 vs 43.3; P<0.05). The results suggest that both in normal rats, and in rats with spinal cord injury, apomorphine given s.c., can produce erection. This finding supports the use of apomorphine for treatment of erectile dysfunction in paraplegia patients. However, due consideration should be given to possible decreases in blood pressure.
Authors:
O Ishizuka; B-J Gu; O Nishizawa; H Mizusawa; K-E Andersson
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of impotence research     Volume:  14     ISSN:  0955-9930     ISO Abbreviation:  Int. J. Impot. Res.     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-04-29     Completed Date:  2002-09-03     Revised Date:  2006-07-03    
Medline Journal Info:
Nlm Unique ID:  9007383     Medline TA:  Int J Impot Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  128-32     Citation Subset:  IM    
Affiliation:
Department of Urology, Shinshu University School of Medicine, Matsumoto, Japan. ishizuk@hsp.md.shinshu-u.ac.jp
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MeSH Terms
Descriptor/Qualifier:
Animals
Apomorphine / pharmacology*
Blood Pressure / drug effects*
Dopamine Agonists / pharmacology*
Male
Penile Erection / drug effects,  physiology*
Penis / drug effects,  innervation*
Rats
Rats, Sprague-Dawley
Receptors, Dopamine / physiology*
Spinal Cord / physiology*
Spinal Cord Injuries / physiopathology
Chemical
Reg. No./Substance:
0/Dopamine Agonists; 0/Receptors, Dopamine; 58-00-4/Apomorphine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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