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Vaporized viral vector shows promise in anti-cancer gene therapy
Date:6/8/2009

ffect persistent genetic changes. They transfected the lentiviral vector with a negative regulator of Akt signaling, carboxyl-terminal modulator protein (CTMP), which would theoretically inhibit Akt signaling, thus suppressing cancer cell proliferation and tumor growth.

Using a mouse model of lung cancer, the researchers designed a double-control study, exposing one-third of the mice to the aerosolized CTMP vector, one-third to the vector alone and one third were untreated.

"In this study, our main purpose was to determine if viral delivery of CTMP can provide useful tool for designing lung tumor treatment," said Dr. Cho. "We would like to demonstrate that CTMP can suppress lung tumor mass in the lungs and lentivirus may act as an effective carrier of CTMP."

After four weeks of twice-weekly treatments, the researchers found exactly that: both pathological and histological examination of the mice revealed that CTMP delivery suppressed lung tumor mass in the lungs of the mice. Furthermore, the number and volume of tumors were significantly decreased in CTMP-treated mice.

The researchers also found that CTMP increased apoptosis, inhibited angiogenesis and suppressed production of several proteins, such as cyclin D1, CDK4 and CDK2, which are important in cancer cell growth.

"Our results demonstrated that lentivirus-mediated CTMP overexpression suppressed Akt activity and inhibited tumor progression," wrote Dr. Cho. "Repeated aerosol gene delivery may provide an effective noninvasive model of gene delivery and understanding the role of CTMP in the multistage lung tumorigenesis may be essential in developing effective therapeutics for lung cancer."


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Contact: Keely Savoie
ksavoie@thoracic.org
212-315-8620
American Thoracic Society
Source:Eurekalert

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