title: Role of adiponectin and its receptor in prediction of reproductive outcome of metformin treatment in patients with polycystic ovarian syndrome.
abstract: OBJECTIVE
  The aim of this study was to examine the effect of metformin on serum adiponectin and adiponectin receptor-1 (AdipoR1) and evaluate their role in prediction of ovulation in patients with polycystic ovarian syndrome (PCOS).
  
  
  METHODS
  The study cohort included 68 PCOS patients with clomiphene citrate resistance (group 1) and 28 healthy women as controls (group 2). Baseline serum adiponectin, AdipoR1, total testosterone (T), and homeostasis model of insulin resistance (HOMA-IR) were measured in all participants. Group 1 received metformin (1500 mg/day) for 6 months followed by second blood sampling.
  
  
  RESULTS
  Group 1 had significantly lower baseline adiponectin and AdipoR1 (P = 0.001) compared to group 2. During treatment, metformin resulted in conception in 5/68 (7%), ovulation in 33/68 (48%) and regular cycles in 41/68 (60%) patients. Group 1 showed post-metformin higher adiponectin and AdipoR1 (P = 0.01) and lower HOMA-IR (P = 0.006) and T (P = 0.001) compared to pre-treatment levels. Post-metformin ovulatory patients had higher adiponectin and AdipoR1 and lower HOMA-IR and T compared to anovulatory patients. Multivariate regression analysis in group 1 showed that only T and HOMA-IR were significant independent factors for predicting ovulatory cycles during metformin treatment (P = 0.04 and P = 0.05, respectively).
  
  
  CONCLUSIONS
  Metformin treatment enhances both adiponectin activity and insulin sensitivity, resulting in a less hyperandrogenic state in patients with PCOS. Serum adiponectin and AdipoR1 are poor predictors of ovulatory outcome during treatment.
authors.affiliation: Department of Obstetrics and Gynecology, Qassim University, Buraidah City, Saudi Arabia; Women's Health Center, Assiut University, Assiut, Egypt.
authors.forename: Hossam O
authors.initials: HO
authors.lastname: Hamed
mesh_terms: D052242:Adiponectin / Q000097:blood*; D000328:Adult; D016022:Case-Control Studies; D015331:Cohort Studies; D005260:Female; D006801:Humans; D007004:Hypoglycemic Agents / Q000494:pharmacology / Q000627:therapeutic use*; D007333:Insulin Resistance; D008687:Metformin / Q000494:pharmacology / Q000627:therapeutic use*; D010060:Ovulation / Q000187:drug effects; D011085:Polycystic Ovary Syndrome / Q000097:blood / Q000188:drug therapy*; D054419:Receptors, Adiponectin / Q000097:blood*
chemical_list: C475418:ADIPOR1 protein, human; D052242:Adiponectin; D007004:Hypoglycemic Agents; D054419:Receptors, Adiponectin; D008687:Metformin
keywords: adiponectin; metformin; polycystic ovary syndrome; reproductive outcome