title: Protection of articular cartilage by intra-articular injection of NEL-like molecule 1 in temporomandibular joint osteoarthritis.
abstract: Several studies have proven the ability of NEL-like molecule-1 (Nell-1) to induce chondrogenesis and make it as a potential candidate for articular cartilage repair. In the current study, the chondroprotective effect of Nell-1 on osteoarthritis (OA) of the temporomandibular joint (TMJ) was investigated by intra-articular injection. Bilateral partial discectomy was performed in 24 rabbits to induce TMJOA. Four weeks later, the right TMJ was treated with Nell-1 as the experimental group, whereas the left was treated with physiologic saline as the control group. Twelve rabbits each time were randomly killed at 12 and 24 weeks after injection, respectively. Histologic observation and metabolic analysis by reverse transcription-polymerase chain reaction were used for evaluation. All TMJs appeared as OA-like histologic changes after intra-articular injection. However, the degree of osteoarthritis in the experimental group was less severe than that in the control group during the experimental time. The expression of type II collagen and aggrecan messenger RNA was significantly higher than the control group at 12 weeks after injection. However, no difference in the expression of aggrecanase or interleukin 1 messenger RNA was observed. The results suggest that intra-articular injection of Nell-1 may be a good alternative for the treatment of cartilage degeneration in OA.
authors.affiliation: The State Key Laboratory of Oral Diseases, and Department of Oral and Maxillofacial Surgery, West China College of Stomatology, Sichuan University, Chengdu, China.
authors.forename: Di
authors.initials: D
authors.lastname: Xiao
authors.forename: Jing
authors.initials: J
authors.lastname: Hu
authors.forename: Kan
authors.initials: K
authors.lastname: Chen
authors.forename: Cheng
authors.initials: C
authors.lastname: Man
authors.forename: Songsong
authors.initials: S
authors.lastname: Zhu
mesh_terms: D053674:Aggrecans / Q000032:analysis; D000818:Animals; D002135:Calcium-Binding Proteins / Q000008:administration & dosage / Q000627:therapeutic use*; D002358:Cartilage, Articular / Q000187:drug effects* / Q000473:pathology; D019902:Chondrocytes / Q000187:drug effects / Q000473:pathology; D020219:Chondrogenesis / Q000187:drug effects; D024043:Collagen Type II / Q000032:analysis; D004195:Disease Models, Animal; D010450:Endopeptidases / Q000032:analysis; D051445:Fibrocartilage / Q000187:drug effects / Q000473:pathology; D006023:Glycoproteins / Q000008:administration & dosage / Q000627:therapeutic use*; D007270:Injections, Intra-Articular; D007375:Interleukin-1 / Q000032:analysis; D010003:Osteoarthritis / Q000188:drug therapy* / Q000473:pathology; D020011:Protective Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D012333:RNA, Messenger / Q000032:analysis; D011817:Rabbits; D011897:Random Allocation; D020133:Reverse Transcriptase Polymerase Chain Reaction; D019224:Temporomandibular Joint Disc / Q000187:drug effects / Q000473:pathology; D013705:Temporomandibular Joint Disorders / Q000188:drug therapy* / Q000473:pathology
chemical_list: D053674:Aggrecans; D002135:Calcium-Binding Proteins; D024043:Collagen Type II; D006023:Glycoproteins; D007375:Interleukin-1; D020011:Protective Agents; D012333:RNA, Messenger; D010450:Endopeptidases; C083641:aggrecanase