Mitogenic effects of neutrophins on a periodontal ligament cell line.
Nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), and neurotrophin-3 (NT-3) are three representative neurotrophins responsible for the differentiation and survival of neurons, and their high-affinity receptors are tropomyosin-receptor-kinase (TRK)A, TRKB, and TRKC, respectively. In this study, we investigated the expression of neurotrophins in a mouse periodontal ligament cell line (MPL), by reverse transcription-polymerase chain-reaction (RT-PCR) and enzyme-linked immunoabsorbent assay (ELISA). We also studied the expression of TRK receptors on MPL by immunostaining and the effects of neurotrophins on the proliferation of MPL, with a hypothesis of autocrine mechanism of neurotrophins. Each neurotrophin and TRK receptor was expressed, and neurotrophins enhanced the proliferation of MPL. These findings suggest that the MPL has functional neurotrophin receptors involved in an autocrine function of neurotrophins. The expression level of neurotrophins and TRKs showed the reverse pattern, and we propose an auto-regulatory mechanism of ligands and receptors in accordance with the level of synthesized neurotrophins.
Tsuboi
Y
Y
Department of Orthodontics, Okayama University Dental School, Japan.
Nakanishi
T
T
Takano-Yamamoto
T
T
Miyamoto
M
M
Yamashiro
T
T
Takigawa
M
M
D000469:Alkaline Phosphatase / Q000032:analysis / Q000235:genetics; D000704:Analysis of Variance; D000818:Animals; D019898:Autocrine Communication; D019208:Brain-Derived Neurotrophic Factor / Q000032:analysis / Q000235:genetics; D002454:Cell Differentiation / Q000502:physiology; D002460:Cell Line; D002470:Cell Survival / Q000502:physiology; D004396:Coloring Agents; D017077:Culture Media, Conditioned; D004797:Enzyme-Linked Immunosorbent Assay; D005786:Gene Expression Regulation; D051379:Mice; D008807:Mice, Inbred BALB C; D008934:Mitogens / Q000032:analysis* / Q000235:genetics; D020932:Nerve Growth Factor / Q000032:analysis / Q000235:genetics; D009414:Nerve Growth Factors / Q000032:analysis* / Q000235:genetics; D009474:Neurons / Q000378:metabolism; D020933:Neurotrophin 3 / Q000032:analysis / Q000235:genetics; D010513:Periodontal Ligament / Q000166:cytology / Q000378:metabolism*; D012333:RNA, Messenger / Q000032:analysis / Q000235:genetics; D020917:Receptor, trkA / Q000032:analysis / Q000235:genetics; D020813:Receptor, trkB / Q000032:analysis / Q000235:genetics; D020812:Receptor, trkC / Q000032:analysis / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013223:Statistics as Topic
D019208:Brain-Derived Neurotrophic Factor; D004396:Coloring Agents; D017077:Culture Media, Conditioned; D008934:Mitogens; D009414:Nerve Growth Factors; D020933:Neurotrophin 3; D012333:RNA, Messenger; D020932:Nerve Growth Factor; D020917:Receptor, trkA; D020813:Receptor, trkB; D020812:Receptor, trkC; D000469:Alkaline Phosphatase