The relationship between (99m)Tc-MIBI uptakes and tumor cell death/proliferation state under irradiation.
To evaluate the potential of 99mTc-MIBI imaging to monitor cellular viability of tumor post-irradiation, Ehrlich carcinoma tissues were exposed to 60Co at different single dose (0, 5, 10, 15 and 20 Gy, respectively) and the following protocol were performed at 6 h pre-irradiation and 24, 72 and 144 h post-irradiation, respectively: (1) 99mTc-MIBI planar scintigraphy was performed. Uptake of 99mTc-MIBI was expressed as differential uptake ratio (DUR) and tumor-to-non-target ratio (T/NT). (2) Apoptosis index (AI), percent of necrosis area (PNA) and Proliferating cell nuclear antigen integral absorbance (PCNA-IA)were measured. DUR and T/NT decreased with radiation dose escalating and post-irradiation time prolonging. At 24 h post-irradiation, DUR or T/NT was inversely correlated with AI or PNA (r=-0.849, -0.829, -0.883, -0.855, respectively, n=33, P<0.01) and positively correlated with PCNA-IA (r=0.789, 0.742, respectively, n=33, P<0.01). At 72 and 144 h post-irradiation, DUR or T/NT was only inversely correlated with PNA (r=-0.967, -0.956, -0.915, -0.886, respectively, n=33, P<0.01). It is suggested that 99mTc-MIBI uptake of tumor cell correlated with the changes of cell viability after irradiation. 99mTc-MIBI imaging may be a potential method to monitor tumor cell viability or therapeutic response after irradiation.
Zhu
Xiaohua
X
Department of Nuclear Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No. 1095, Jiefang Dadao, 430030, Wuhan, PR China.
Wu
Hua
H
Xia
Jingsong
J
Zhao
Ming
M
Xianyu
Zhiqun
Z
D000818:Animals; D017209:Apoptosis / Q000528:radiation effects; D002286:Carcinoma, Ehrlich Tumor / Q000000981:diagnostic imaging* / Q000473:pathology*; D016923:Cell Death; D002455:Cell Division; D003037:Cobalt Radioisotopes; D005260:Female; D051379:Mice; D008815:Mice, Inbred Strains; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics*; D017256:Technetium Tc 99m Sestamibi / Q000493:pharmacokinetics*
D003037:Cobalt Radioisotopes; D019275:Radiopharmaceuticals; D017256:Technetium Tc 99m Sestamibi