P21-Activated Kinase 1 Overactivates in Eutopic Endometrium of Adenomyosis

Area of Science:

• Gynecological pathology
• Cellular biology
• Molecular mechanisms of disease

Background:

• Adenomyosis is a prevalent gynecological condition where endometrial tissue invades the myometrium.
• The precise molecular pathogenesis of adenomyosis remains incompletely understood.
• P21-activated kinase 1 (PAK1), a key regulator of the cytoskeleton, is implicated in various cellular processes.

Purpose of the Study:

• To investigate the expression and activation status of PAK1 in women with and without adenomyosis.
• To compare PAK1 activity in eutopic endometrium and ectopic adenomyotic lesions.
• To explore the correlation between PAK1 activation and reproductive outcomes.

Main Methods:

• Immunohistochemistry was employed for semi-quantitative assessment of PAK1 and its active form, phosphorylated-PAK1 (pPAK1).
• Immunofluorescence microscopy was utilized to visualize the cellular localization of pPAK1.
• Comparative analysis was performed between women diagnosed with adenomyosis and healthy controls.

Main Results:

• PAK1 demonstrated overactivation in the eutopic endometrium of adenomyosis patients compared to controls.
• Phosphorylated-PAK1 (pPAK1) was observed along the apical glandular cell membrane.
• PAK1 expression decreased, and activation returned to baseline levels within ectopic adenomyotic lesions.
• pPAK1 expression levels correlated with the frequency of reproduction.

Conclusions:

• Overactivation of PAK1 in the endometrium is suggested as a significant factor in adenomyosis pathogenesis.
• Reduced PAK1 phosphorylation in ectopic sites may facilitate lesion development.
• PAK1 signaling represents a potential therapeutic target for adenomyosis.