Lower urinary tract symptoms and sexual dysfunction: epidemiology and pathophysiology

Area of Science:

• Urology
• Andrology
• Pathophysiology

Background:

• Epidemiological studies reveal a strong association between lower urinary tract symptoms (LUTS) and sexual dysfunction, particularly erectile dysfunction (ED).
• This link persists independently of age and common comorbidities like hypertension and diabetes.
• A definitive causal relationship between LUTS and ED remains to be established.

Purpose of the Study:

• To explore the pathophysiological mechanisms potentially linking LUTS and ED.
• To identify common pathways that could explain the co-occurrence of these conditions.
• To provide a basis for future research investigating therapeutic interventions for both LUTS and ED.

Main Methods:

• Review and synthesis of existing scientific literature on LUTS and ED.
• Analysis of four proposed pathophysiological mechanisms: nitric oxide synthase (NOS)/NO pathway, autonomic hyperactivity and metabolic syndrome, Rho-kinase activation/endothelin pathway, and pelvic atherosclerosis.
• Examination of how these mechanisms affect the prostate, bladder, urethra, and erectile tissues.

Main Results:

• The nitric oxide synthase (NOS)/NO theory suggests reduced NOS in the prostate and bladder/urethra contributes to ED in bladder outlet obstruction (BOO).
• Autonomic hyperactivity and metabolic syndrome link benign prostatic hyperplasia (BPH) to cardiovascular risk factors and ED via increased sympathetic activity.
• Rho-kinase activation and pelvic atherosclerosis are proposed as common pathways influencing smooth muscle contractility in both LUTS/BPH and ED.

Conclusions:

• Multiple pathophysiological mechanisms, including NOS/NO signaling, autonomic dysregulation, Rho-kinase activity, and pelvic ischemia, may underlie the association between LUTS and ED.
• These shared pathways offer potential targets for novel therapeutic strategies addressing both conditions concurrently.
• Further studies examining the impact of treating one condition on the other are warranted to solidify the causal link.