Assessment of 11C-labeled-4-N-(3-bromoanilino)-6,7-dimethoxyquinazoline as a positron emission tomography agent to monitor epidermal growth factor receptor expression.
The aim of the present study was to investigate the biodistribution of (11)C-labeled-4-N-(3-bromoanilino), 6,7-dimethoxyquinazoline ((11)C-PD153035) and the relationship between accumulation of the tracer and epidermal growth factor receptor (EGFR) expression levels. Biodistribution studies of (11)C-PD153035 were performed in tumor-bearing nude mice. The amount of radioactivity in the lungs was small while concentrations were highest in the liver and intestine. From in vitro studies, the level of (11)C-PD153035 accumulation was detected in MDA-MB-468, A549, and MDA-MB-231 cells. The uptake of (11)C-PD153035 in cells was closely correlated with the EGFR expression level of cells (r(2) = 0.85; P < 0.001), and the results obtained in excised tumors were also significantly correlated (r(2) = 0.63; P = 0.003). Binding in MDA-MB-468, A549, and MDA-MB-231 tumors was reduced to background level at 60 min post injection( 11)C-PD153035 by pretreatment with cold PD153035. The present study showed that whether in vitro or ex vivo the uptake of (11)C-PD153035 closely correlated with EGFR expression levels. In contrast, blocking studies revealed specific binding in the three kinds of tumors. Thus (11)C-PD153035 may be used as a positron emission tomography tracer to yield useful information about tumors, particularly for lung cancer with different EGFR expression levels.
Wang
Hui
H
Medical School of Shandong University, Wenhua West Road 44, Jinan, Shandong 250012, China.
Yu
Jinming
J
Yang
Guoren
G
Song
Xianrang
X
Sun
Xiaorong
X
Zhao
Shuqiang
S
Mu
Dianbin
D
D000818:Animals; D014408:Biomarkers, Tumor / Q000378:metabolism; D002250:Carbon Radioisotopes / Q000378:metabolism*; D045744:Cell Line, Tumor; D066246:ErbB Receptors / Q000096:biosynthesis* / Q000235:genetics* / Q000378:metabolism; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000378:metabolism; D008325:Mammary Neoplasms, Experimental / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009928:Organ Specificity; D049268:Positron-Emission Tomography; D011799:Quinazolines / Q000378:metabolism*
D014408:Biomarkers, Tumor; D002250:Carbon Radioisotopes; D011799:Quinazolines; D066246:ErbB Receptors; C088860:4-((3-bromophenyl)amino)-6,7-dimethoxyquinazoline