Infertility, IL-17, IL-33 and Microbiome Cross-Talk: The Extended ARIA-MeDALL Hypothesis

Area of Science:

• Reproductive immunology
• Microbiome research
• Endocrinology

Background:

• Infertility prevalence is rising, mirroring increases in chronic inflammatory and autoimmune diseases.
• The ARIA-MeDALL hypothesis links these conditions to dysbiosis and cytokines like interleukin-17 (IL-17) and interleukin-33 (IL-33).

Purpose of the Study:

• To investigate the link between endometriosis, a major cause of infertility, and endometrial dysbiosis.
• To explore the role of IL-17 and IL-33 in the gut-endometrial axis and their interaction with intestinal dysbiosis.

Main Methods:

• The study proposes a connection between endometrial dysbiosis, IL-17, and IL-33.
• It hypothesizes that intestinal dysbiosis elevates estrogen levels, promoting endometriosis.

Main Results:

• Elevated estrogen levels, driven by intestinal dysbiosis, are identified as a key factor in endometriosis.
• Estrogens are shown to strongly activate IL-17 and IL-33, supporting the proposed axis.

Conclusions:

• Endometriosis and infertility are potentially linked through a gut-endometrial axis.
• Dysbiosis and specific cytokine interactions (IL-17, IL-33) play a significant role in this axis and contribute to infertility.