title: Circulating hyaluronic acid in nonpregnant, pregnant, and postpartum guinea pigs: elevated levels observed at parturition.
abstract: OBJECTIVE
  Dilatation of the uterine cervix at parturition is associated with an increase in cervical hyaluronic acid content. The objective is to test the hypothesis that circulating hyaluronic acid is increased at parturition.
  
  
  METHODS
  Serum hyaluronic acid levels from nonpregnant (n = 5), pregnant (n = 13), and postpartum (n = 4) adult Hartley guinea pigs were determined with a radiometric assay that utilizes iodine 125-labeled hyaluronic acid-binding protein. Results were analyzed for statistical significance with Student's paired t test and regression analysis.
  
  
  RESULTS
  The serum hyaluronic acid level in nonpregnant animals was 238 +/- 88 ng/ml (mean +/- SEM). During pregnancy, serum hyaluronic acid levels were 127 +/- 12 and 126 +/- 34 ng/ml at 25 and 50 to 63 days' gestation, respectively. At parturition, hyaluronic acid levels increased fivefold to 765 +/- 111 ng/ml (p less than 0.001). Hyaluronic acid levels returned to antepartum values 2 days post partum (153 +/- 27 ng/ml). There was no significant difference between arterial and venous levels.
  
  
  CONCLUSIONS
  Circulating hyaluronic acid levels increase significantly at parturition in the guinea pig.
authors.affiliation: Department of Obstetrics and Gynecology, McGill University, Montreal, Quebec, Canada.
authors.forename: M R
authors.initials: MR
authors.lastname: Rajabi
authors.forename: E W
authors.initials: EW
authors.lastname: Quillen
authors.forename: B S
authors.initials: BS
authors.lastname: Nuwayhid
authors.forename: R
authors.initials: R
authors.lastname: Brandt
authors.forename: A R
authors.initials: AR
authors.lastname: Poole
mesh_terms: D000818:Animals; D001158:Arteries; D005260:Female; D006168:Guinea Pigs; D006820:Hyaluronic Acid / Q000097:blood*; D007743:Labor, Obstetric / Q000097:blood*; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000097:blood*; D014680:Veins
chemical_list: D006820:Hyaluronic Acid