Abstract: The present invention relates to a composition comprising 4-hexylresorcinol(4-HR) as an active ingredient for prevention or treatment of a bone disease, and a formulation thereof. The composition comprising 4-hexylresorcinol (4-HR) as an active ingredient, or an ointment thereof was found to improve bone thickness, density, and strength and control bone remodeling by promoting the differentiation of osteoblasts and suppressing the proliferation and differentiation of osteoclasts in osteoporosis-induced animal models. Thus, the composition or ointment comprising 4-hexylresorcinol (4-HR) as an active ingredient can be provided as a therapeutic agent for bone diseases including bone fracture, osteoarthritis, rheumatoid arthritis, and osteoporosis.

Abstract: Disclosed is a reagent for diagnosing osteoarthritis or predicting the prognosis of osteoarthritis, the reagent containing a peptide having the amino acid sequence (CQRPPR) of SEQ ID NO: 1 as an active ingredient. The present peptide can be used to accurately diagnose osteoarthritis in its early stage based on the molecular imaging technique. The present peptide has a small molecular weight, and thus has advantages of fast clearance from the blood, effective permeation into the tissue, low immunogenicity, and low-production cost. Further, the present reagent can diagnose osteoarthritis in its early stage in which the destruction of cartilage is in a reversible phase and thus can be recovered to a normal state, thereby significantly contributing to effective treatment of osteoarthritis.