Targeting Adenosine A2b Receptor Promotes Penile Rehabilitation of Refractory Erectile Dysfunction

Area of Science:

• Urology
• Pharmacology
• Molecular Biology

Background:

• The role of adenosine and its receptor subtypes in penile erection and rehabilitation is not fully understood.
• Erectile dysfunction (ED) remains a significant clinical challenge, with limited understanding of underlying molecular mechanisms for rehabilitation.

Purpose of the Study:

• To identify specific adenosine receptor subtypes involved in adenosine-mediated penile erection.
• To investigate the therapeutic potential of targeting adenosine receptors for the rehabilitation of refractory erectile dysfunction.

Main Methods:

• Single-cell RNA sequencing of human corpus cavernosum and adenosine receptor knockout mice.
• Establishment of rat models for age-related, BCNC-induced, and diabetes-induced ED.
• In vitro studies on primary corpus cavernosum smooth muscle cells under hypoxic conditions and in vivo administration of agonists/antagonists.

Main Results:

• Corpus cavernosum in ED patients showed reduced expression of adenosine A1, A2a, and A2b receptors.
• Adenosine A2b receptor knockout abolished adenosine-induced erection; A2b receptor activation improved erectile function in ED models.
• A2b receptor activation reduced hypoxia-inducible factor 1-alpha (HIF-1α) and transforming growth factor-beta (TGF-β) in ED models.

Conclusions:

• The adenosine A2b receptor is the primary mediator of adenosine-induced penile erection.
• Activating the A2b receptor promotes penile rehabilitation in refractory ED by mitigating hypoxia and fibrosis.