Document Detail

Treatment of erectile dysfunction due to C677T mutation of the MTHFR gene with vitamin B6 and folic acid in patients non responders to PDE5i.
MedLine Citation:
PMID:  19694922     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: Epidemiological studies conducted on erectile dysfunction (ED) have demonstrated its close correlation with cardiovascular disease. Since hyperhomocysteinemia is considered an important cardiovascular risk factor, it could also be involved in the pathogenesis of ED.
AIM: To study the role of the C677T MTHFR mutation with subsequent hyperhomocysteinemia in the determination of ED.
METHODS: We studied 75 consecutive patients presenting with ED. Patients were interviewed using the International Index of Erectile Function. Blood samples were drawn for determination of MTHFR gene C677T mutation, homocysteine (Hcy) and folate levels. Penile color Doppler was also performed.
MAIN OUTCOME METHODS: Patients were administered sildenafil citrate for 2 months. The nonresponders were treated with combination of sildenafil, vitamin B6, and folic acid for 6 weeks. Patients were split into three groups, A, B, and C on the basis on their MTHFR genotype, and in a further group defined as "sildenafil nonresponders" (NR).
RESULTS: We found 20 patients homozygous for mutant MTHFR 677T, 36 heterozygous, and 19 wild type. Difference in baseline values for Hcy and folic acid was found between groups A and B, and A and C. The NR group (18 patients from group A and B), presented high levels of Hcy and low levels of folic acid. After combination treatment 16 of them (88.9%) revealed an improvement in the IIEF questionnaire. Moreover, it was measured a significant difference between the values of Hcy and folic acid at the baseline and at the end of the study for the nonresponders.
CONCLUSIONS: Hyperhomocysteinemia in patients homozygotes for the C677T mutation may interfere with erection mechanisms and thus be responsible for ED. In case of hyperhomocysteinemia associated with low levels of folates, the administration of PDE5 inhibitors may fail if not preceded by the correction of the alterated levels of Hcy and folates.
Francesco Lombardo; Petros Tsamatropoulos; Emanuela Piroli; Franco Culasso; Emmanuele Angelo Jannini; Franco Dondero; Andrea Lenzi; Loredana Gandini
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-08-17
Journal Detail:
Title:  The journal of sexual medicine     Volume:  7     ISSN:  1743-6109     ISO Abbreviation:  J Sex Med     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-01-22     Completed Date:  2010-04-08     Revised Date:  2013-11-06    
Medline Journal Info:
Nlm Unique ID:  101230693     Medline TA:  J Sex Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  216-23     Citation Subset:  IM    
Department of Medical Pathophysiology, University of Rome La Sapienza, Rome, Italy.
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MeSH Terms
DNA Mutational Analysis*
Folic Acid / therapeutic use*
Heterozygote Detection
Hyperhomocysteinemia / drug therapy*,  genetics*
Impotence, Vasculogenic / drug therapy*,  genetics*
Methylenetetrahydrofolate Reductase (NADPH2) / genetics*
Middle Aged
Phosphodiesterase 5 Inhibitors*
Phosphodiesterase Inhibitors / adverse effects,  therapeutic use*
Piperazines / adverse effects,  therapeutic use*
Purines / adverse effects,  therapeutic use
Sulfones / adverse effects,  therapeutic use*
Treatment Failure
Vitamin B 6 / therapeutic use*
Reg. No./Substance:
0/Phosphodiesterase 5 Inhibitors; 0/Phosphodiesterase Inhibitors; 0/Piperazines; 0/Purines; 0/Sulfones; 3M7OB98Y7H/sildenafil; 59-30-3/Folic Acid; 8059-24-3/Vitamin B 6; EC Reductase (NADPH2)

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

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