Pyrazole Inhibitors Target ALDH1A2 for Reversible Male Contraception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current male contraceptive options are limited and often ineffective or irreversible, with a need for a safe, reversible, non-hormonal method that can effectively inhibit spermatogenesis without significant side effects.
Innovation Solution
Development of specific inhibitors targeting ALDH1A1 and ALDH1A2 enzymes to block testicular retinoic acid biosynthesis, using pyrazole and piperazine compounds to prevent spermatogenesis without affecting other aldehyde dehydrogenase isozymes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If WIN 18,446 is used to inhibit spermatogenesis, then contraceptive efficacy is improved, but disulfiram reaction side effects occur
Solution Approach 1:
The invention extracts and isolates the specific biochemical pathway (testicular retinoic acid biosynthesis) responsible for spermatogenesis from the general hormonal system. By targeting ALDH1A1 and ALDH1A2 enzymes specifically in the testes, the compound achieves contraceptive efficacy without systemic hormonal effects that cause disulfiram reactions.
Solution Approach 2:
The compound exhibits local action specifically in the testes by inhibiting retinoic acid biosynthesis only in this tissue. The patent demonstrates that testicular retinoic acid levels are selectively reduced without affecting systemic hormone levels, thereby achieving local contraceptive effect without systemic side effects.
2Reliability
If hormonal contraceptives are used, then spermatogenesis is inhibited, but endocrine function is affected
Solution Approach 1:
The invention segments the contraceptive mechanism from the endocrine system by targeting a specific metabolic pathway (retinoic acid biosynthesis) rather than hormonal receptors. This segmentation allows spermatogenesis inhibition without interfering with testicular endocrine function, as the enzyme inhibition is confined to retinoic acid production.
Solution Approach 2:
The compound acts as an intermediary by blocking the conversion of retinal to retinoic acid via ALDH1A1/1A2 enzymes. This intermediary action on a metabolic intermediate (retinoic acid) rather than on hormones allows precise control over spermatogenesis without disrupting the broader endocrine system.
3Reliability
If vasectomy is performed, then contraceptive efficacy is improved, but reversibility and cost are worsened
Solution Approach 1:
The invention replaces the mechanical surgical intervention of vasectomy with a biochemical mechanism (enzyme inhibition). Instead of physically blocking or cutting the vas deferens, the compound chemically inhibits retinoic acid biosynthesis, achieving the same contraceptive effect through a reversible pharmacological action rather than irreversible surgery.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a safe, reversible, and non-hormonal approach to male contraception, effectively inhibiting spermatogenesis and reducing the risk of unintended pregnancy, with potential for widespread use and acceptance.
Implementation Method 1
specific inhibitors of ALDH1A1 and ALDH1A2... pyrazole compounds as inhibitors of ALDH1A1 and ALDH1A2... piperazine compounds as inhibitors of ALDH1A1 and ALDH1A2... inhibition of testicular retinoic acid biosynthesis
Data Source
AI summary
Pyrazole compounds and piperazine compounds that are inhibitors of ALDH1A1 and ALDH1A2 and methods for using the pyrazole compounds and piperazine compounds in male contraceptive compositions for preventing spermatogenesis.