Imaging Cell Death with Radiolabeled Annexin V in an Experimental Model of Rheumatoid Arthritis

Journal of Nuclear Medicine

Anneke M. Post¹  Sharon M. Geaghan¹  Peter D. Katsikis¹  Jonathan F. Tait¹  Francis G. Blankenberg¹  H. William Strauss¹ 

关键词: annexin V;    rheumatoid arthritis;    apoptosis;    radionuclide;   

DOI  :  

学科分类：医学（综合）

来源: Society of Nuclear Medicine

【 摘 要 】

Rheumatoid arthritis is associated with chronic synovial inflammation due to the abnormal accumulation of macrophages and autoreactive T lymphocytes in joints. The autoreactive cells cause an inflammatory proapoptotic response to self-antigens resulting in eventual bone, cartilage, and soft-tissue loss and destruction. The goal of our study was to determine the timing and intensity of apoptosis in joints using 99mTc-labeled annexin V, an in vivo marker of apoptosis, in a murine model of immune arthritis. Methods: We used 99mTc-annexin V and autoradiography to study the extent and severity of apoptosis in the front and rear paws of DBA/1 mice with type II collagen-induced rheumatoid arthritis. Results: Compared with control values (n = 10), there was a significant (P < 0.002) nearly 3-fold increase in uptake of 99mTc-annexin V in the front foot pads, rear toes, rear foot pads, and heels at the time of maximal extremity swelling as determined by serial caliper measurements at 4 wk after inoculation with type II bovine collagen (n = 9). The front toes had a 5- to 6-fold increase in uptake compared with control values (P < 0.001). Histologic analysis revealed only scattered rare lymphocytes in the periarticular soft tissues, without joint destruction. Dual autoradiography with 125I-bovine serum albumin as a control showed that 99mTc-annexin V localization was specific. Treatment with methylprednisolone for 1 wk (n = 8) at 4 wk after immunization with type II collagen decreased 99mTc-annexin V uptake by 3- to 6-fold compared with control values (P < 0.002). Conclusion: 99mTc-annexin V can detect collagen-induced immune arthritis and its response to steroid therapy before joint destruction.

【 授权许可】

Unknown