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en Neuregulin 4 in Polycystic Ovarian Syndrome (PCOS) Phenotypes: A Key Role or Standby بیوشیمی Biochemistry مقالات اصلی Original Article <div style="text-align: justify;">Background: Neuregulin_4 (NRG4) is one of the adipokines members that synthesize adipose tissues. It has an activating effect on epidermal growth factor receptors (ErbB receptors). NRG4 has indirect effects on the hormonal environment through its interaction to ErbB receptors. Increased insulin resistance and chronic low-grade inflammation may be present when NRG4 levels are high in PCOS. Obesity and polycystic ovarian syndrome have recently gained a lot of attention. However, the literature on the connection between NRG4 and the PCOS phenotype is limited. Thus, this research aimed to identify neuregulin_4's function as a biomarker for insulin resistance in PCOS phenotypes. Methods: A case-control study and included 140 female cases effect by different phenotypes of PCOS. Patients samples were collected at the reproductive fertility consultant of the Teaching Hospital for Obstetrics and Gynecology, Kerbala health directorate, Iraq. The outpatient clinic serum hormonal levels and insulin concentration were determined by the electrochemiluminescence immunoassay “ECLIA” system. Elisa system was used for the detection of Neuregulin-4 protein level. Results: At the early age of participant NRG4 was increased significantly in all phenotypes of PCOS compared to control with a P< 0.05. interestingly, phenotype A was shown high level of NRG4 following phenotype C than phenotype D and phenotype B. Receiver Operator Characteristic Curves (ROC) analysis for NRG4 was performed and showed good diagnostic performers to word phenotype A. Conclusion: Females with phenotype A have a higher level of NRG4 than other phenotypes, which could be attributable to the more pronounced metabolic abnormalities in this phenotype.</div> Metabolic disturbances, Neuregulin 4, Polycystic Ovarian Syndrome Phenotypes. 359 365 http://rbmb.net/browse.php?a_code=A-10-1339-1&slc_lang=en&sid=1 Afnan Abbood 100319475328460018547 100319475328460018547 No Department of Biochemistry, College of Medicine, University of Kerbala, Kerbala, Iraq. Rana Majeed Hameed ranamajeed81@gmail.com 100319475328460018548 100319475328460018548 Yes Department of Biochemistry, College of Medicine, University of Kerbala, Kerbala, Iraq. Wasan Ghazi Al Safi 100319475328460018549 100319475328460018549 No Department of Obstetrics and Gynecology, College of Medicine, University of Kerbala, Kerbala, Iraq.