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- W2000554750 abstract "Lower numbers of neuropeptide-containing fibers in arthritic joints have been found as compared to control joints. This may be the result of fiber depletion, necrosis of fibers, or proliferation of soft tissues without neural sprouting. To discriminate between these possibilities, we studied the relationships between soft tissue proliferation, changes in vascularity of synovial tissues, and changes in joint innervation during arthritis. Arthritis was induced in the knee joint of mice by a single subpatellar injection of methylated bovine serum albumin after previous immunization. Antibodies to protein gene product 9.5, S-100, and growth-associated protein-43 (GAP-43) were used to study the general innervation pattern. Antibodies to calcitonin gene-related peptide (CGRP), vasointestinal polypeptide (VIP), substance P (SP), and tyrosine hydroxylase (TH) were used to localize sensory (SP, CGRP, VIP) and sympathetic (TH) fibers. Blood vessels of the joint were studied with ink perfusion, GAP-43, and a vascular marker (LF1). Directly after the induction of arthritis, the synovial cavity was enlarged and filled with leukocytes. From day 4 onward, small sprouting blood vessels penetrated the avascular mass of cells in the joint cavity. After 1 week, the vascular sprouting activity and GAP-43 immunoreactivity were maximal, and after 2 weeks, vascular sprouting activity diminished. In the subsequent period, the synovia slowly regained their prearthritic appearance and thickness. The most pronounced changes in the general staining pattern of CGRP, SP, VIP, and TH were found in the periosteum. From 2 days to 4 weeks after the induction of arthritis, the layer of SP, CGRP, and VIP fibers in the femoral periosteum was thicker and more irregular. GAP-43 staining showed many terminal varicosities, which suggested sprouting of nerve fibers. From 2 days to 2 weeks after the induction of arthritis, the SP and CGRP fibers in the periosteum showed gradual depletion. In the thickened subsynovial tissues that were revascularized, no ingrowth of neural elements was found. As the total number of nerve fibers in the synovial tissue did not change, large parts of the synovia directly facing the joint cavity were not innervated at 1 week after the induction of arthritis. These results strongly suggest that periosteal SP and CGRP fibers were depleted during arthritis. Synovial proliferation without concomitant fiber growth is the main cause of the reduced number of immunocytochemically detectable fibers in the mouse arthritic knee joint. Anat Rec 260:51–61, 2000. © 2000 Wiley-Liss, Inc." @default.
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- W2000554750 date "2000-01-01" @default.
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- W2000554750 title "Neurovascular plasticity in the knee joint of an arthritic mouse model" @default.
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- W2000554750 doi "https://doi.org/10.1002/1097-0185(20000901)260:1<51::aid-ar60>3.0.co;2-9" @default.
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