The present invention relates to the uses of the protein PRG4 and therapeutic modulation thereof. In particular, the present invention relates compositions and methods utilizing PRG4 and therapeutic modulation thereof, including, use as a surgical lubricant, use in a treatment for prevention or reduction of post-surgical adhesions, use in a treatment for oral ulcerations, use as an athletic lubricating patch, use as a dermal filler, use in a treatment for dry mouth, use in a drug delivery method or composition, and use in nursing lubrication.
