Inconsistency in circulating irisin levels: what is really happening?

Area of Science:

• Endocrinology
• Metabolic Research
• Molecular Biology

Background:

• Irisin, a myokine, was discovered as a potential therapeutic agent for metabolic disorders like obesity and diabetes.
• High expectations surround irisin's potential benefits for various pathological conditions.
• Recent studies report conflicting findings on circulating irisin levels and its metabolic functions.

Purpose of the Study:

• To address the discrepancies and contradictions in current irisin research.
• To evaluate the reliability of irisin measurements using Enzyme-Linked Immunosorbent Assay (ELISA).
• To discuss the implications of these inconsistencies for clinical practice and future research.

Main Methods:

• Review and analysis of existing literature on irisin.
• Critical examination of studies reporting irisin concentrations and their correlations.
• Discussion of the challenges associated with irisin detection and quantification.

Main Results:

• Heterogeneous and discrepant results regarding circulating irisin concentrations were observed across studies.
• Controversies exist regarding irisin's precise role in human metabolism.
• The reliability and clinical readiness of ELISA-based irisin measurement are questioned.

Conclusions:

• Current data on irisin is inconsistent, raising concerns about its validity and clinical application.
• Further rigorous research is essential to confirm irisin's existence, function, and reliable measurement.
• The clinical utility of irisin as a therapeutic target remains uncertain pending resolution of these discrepancies.