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Imaging agents offer new view of inflammation, cancer

Date:
October 8, 2011
Source:
Vanderbilt University Medical Center
Summary:
A series of novel imaging agents could make it possible to "see" tumors in their earliest stages, before they turn deadly. The compounds, derived from inhibitors of the enzyme cyclooxygenase-2 and detectable by positron emission tomography imaging, may have broad applications for cancer detection, diagnosis and treatment.

A series of novel imaging agents could make it possible to "see" tumors in their earliest stages, before they turn deadly.

The compounds, derived from inhibitors of the enzyme cyclooxygenase-2 (COX-2) and detectable by positron emission tomography (PET) imaging, may have broad applications for cancer detection, diagnosis and treatment.

Vanderbilt University investigators describe the new imaging agents in a paper featured on the cover of the October issue of Cancer Prevention Research.

"This is the first COX-2-targeted PET imaging agent validated for use in animal models of inflammation and cancer," said Lawrence Marnett, Ph.D., director of the Vanderbilt Institute of Chemical Biology and leader of the team that developed the compounds.

COX-2 is an attractive target for molecular imaging. It's not found in most normal tissues, and then it is "turned on" in inflammatory lesions and tumors, Marnett explained.

"As a tumor grows and becomes increasingly malignant, COX-2 levels go up," Marnett said.

To develop compounds that target COX-2 and can be detected by PET imaging, Jashim Uddin, Ph.D., research assistant professor of Biochemistry, started with the "core" chemical structures of the anti-inflammatory medicines indomethacin and celecoxib and modified them to add the element fluorine in various chemical configurations.

After demonstrating that the fluorinated compounds were selective inhibitors of COX-2, the investigators incorporated radioactive fluorine (18-F) into the most promising compound. Intravenous injection of this 18-F compound into animal models provided sufficient signal for PET imaging.

The researchers demonstrated the potential of this 18-F compound for in vivo PET imaging in two animal models: irritant-induced inflammation in the rat footpad and human tumors grafted into mice.

They showed that the 18-F compound accumulated in the inflamed foot, but not the non-inflamed foot, and that pre-treatment of the animals with celecoxib blocked the signal. In mice bearing both COX-2-positive and COX-2-negative human tumors, the 18-F compound accumulated only in the COX-2-positive tumor.

The studies support further development of these agents as probes for early detection of cancer and for evaluation of the COX-2 status of pre-malignant and malignant tumors.

"Because COX-2 levels increase during cancer progression in virtually all solid tumors, we think these imaging tools will have many, many different applications," Marnett said.

The research was supported by the National Cancer Institute. The Center for Small Animal Imaging at the Vanderbilt University Institute of Imaging Science enabled the radiochemical synthesis and imaging studies.


Story Source:

The above story is based on materials provided by Vanderbilt University Medical Center. Note: Materials may be edited for content and length.


Journal Reference:

  1. M. J. Uddin, B. C. Crews, K. Ghebreselasie, I. Huda, P. J. Kingsley, M. S. Ansari, M. N. Tantawy, J. Reese, L. J. Marnett. Fluorinated COX-2 Inhibitors as Agents in PET Imaging of Inflammation and Cancer. Cancer Prevention Research, 2011; 4 (10): 1536 DOI: 10.1158/1940-6207.CAPR-11-0120

Cite This Page:

Vanderbilt University Medical Center. "Imaging agents offer new view of inflammation, cancer." ScienceDaily. ScienceDaily, 8 October 2011. <www.sciencedaily.com/releases/2011/10/111007132355.htm>.
Vanderbilt University Medical Center. (2011, October 8). Imaging agents offer new view of inflammation, cancer. ScienceDaily. Retrieved April 24, 2014 from www.sciencedaily.com/releases/2011/10/111007132355.htm
Vanderbilt University Medical Center. "Imaging agents offer new view of inflammation, cancer." ScienceDaily. www.sciencedaily.com/releases/2011/10/111007132355.htm (accessed April 24, 2014).

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