title: Aqueous hyaluronic acid concentration: comparison in pediatric and adult patients.
abstract: OBJECTIVE
  To determine if there is an age-related increase in human aqueous hyaluronic acid (HA) concentration.
  
  
  METHODS
  HA concentrations were measured in 102 specimens of human aqueous humour obtained during intraocular surgery. Patient age ranged from one month to 93 years. Measurement of the HA concentration in the specimens was performed by a modified ELISA-like assay using a biotinylated HA-binding peptide.
  
  
  RESULTS
  An approximate five-fold increase in the mean aqueous HA concentration was observed between the pediatric (0.33 microgram/ml, n = 5) and the adult patients (1.72 micrograms/ml, n = 97, p < 0.0002). Among the adult patients, however, there was a poor correlation between age and aqueous HA concentration.
  
  
  CONCLUSIONS
  Adult aqueous humor has a significantly higher HA concentration than aqueous obtained from pediatric patients. The source of this increase is unclear, but may be from anterior segment production of HA, or alternatively, from anterior diffusion of vitreous HA.
authors.affiliation: Beckman Vision Center, Department of Ophthalmology, San Francisco, CA, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Jumper
authors.forename: D F
authors.initials: DF
authors.lastname: Chang
authors.forename: C S
authors.initials: CS
authors.lastname: Hoyt
authors.forename: J L
authors.initials: JL
authors.lastname: Hall
authors.forename: R
authors.initials: R
authors.lastname: Stern
authors.forename: D M
authors.initials: DM
authors.lastname: Schwartz
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D001082:Aqueous Humor / Q000737:chemistry*; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D006820:Hyaluronic Acid / Q000032:analysis*; D008875:Middle Aged
chemical_list: D006820:Hyaluronic Acid