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Is DPP4 activity increased in PCOS?

Letícia Dinis da C Braga1, Amelio F Godoy-Matos1, Priscila de Oliveira Siciliano1

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Summary

Dipeptidyl peptidase-4 (DPP4) activity was similar in women with polycystic ovary syndrome (PCOS) and healthy controls. However, DPP4 showed correlations with insulin resistance markers in PCOS patients, suggesting a potential role despite similar overall activity.

Keywords:
AdipokineDipeptidyl peptidase-4Insulin resistancePolycystic ovary syndrome

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Area of Science:

  • Endocrinology
  • Metabolic Syndrome
  • Reproductive Endocrinology

Background:

  • Dipeptidyl peptidase-4 (DPP4) is an adipokine linked to insulin resistance (IR).
  • Polycystic ovary syndrome (PCOS) is a common endocrine disorder frequently associated with IR.
  • Evaluating DPP4 activity in PCOS is crucial for understanding metabolic dysregulation in this condition.

Purpose of the Study:

  • To investigate and compare dipeptidyl peptidase-4 (DPP4) activity in women with and without polycystic ovary syndrome (PCOS).
  • To explore the relationship between DPP4 activity and markers of insulin resistance, hyperandrogenism, and body composition in PCOS patients.

Main Methods:

  • Comparative study involving 30 women with PCOS and 28 healthy controls.
  • Assessment of body composition using dual-energy X-ray absorptiometry (DXA).
  • Measurement of plasma DPP4 activity, biochemical variables, glucose, and insulin levels during an oral glucose tolerance test.

Main Results:

  • DPP4 activity levels were comparable between the PCOS and control groups (p=0.20).
  • PCOS patients exhibited significantly higher insulin resistance (HOMA-IR) and lower SHBG and Matsuda index compared to controls (p<0.05).
  • DPP4 activity demonstrated significant correlations with HbA1c, HDL-c, and SHBG levels in the study population (p<0.05).

Conclusions:

  • Despite similar DPP4 activity, PCOS patients present with established insulin resistance and hyperandrogenism.
  • DPP4 activity is associated with key markers of metabolic health, including glycemic control, lipid profile, and sex hormone-binding globulin.
  • Further research is warranted to elucidate the precise role of DPP4 in the pathophysiology of PCOS and its associated metabolic complications.