In the latest research, human bladder cancer cells labeled with luciferase were inoculated into mice, creating a xenograft bladder cancer model. The primary bladder xenograft gradually grew and, after 45 days, metastatic tumors were detected in the lungs, liver and bone. By using a microarray analysis including more than 20,000 genes for the metastatic tumors, the team discovered a three- to 25-fold increase of the metabolic enzyme aldo-keto reductase 1C1 (AKR1C1). They also found high levels of AKR1C1 in metastatic tumors removed from 25 cancer patients, proving that the phenomena discovered in the mice also occur in the human body. Along with anticancer drugs, an inflammatory substance produced around the tumor, such as interleukin-1β, increased the enzyme levels.
The researchers also identified for the first time that AKR1C1 enhances tumor-promoting activities and proved that the enzyme blocks the effectiveness of cisplatin and other anticancer drugs.
The researchers finally discovered that inoculating flufenamic acid, an inhibitory factor for AKR1C1, into cancerous bladder cells suppressed the cells' invasive activities and restored the effectiveness of anticancer drugs. Flufenamic acid is also known as a nonsteroid anti-inflammatory drug used for treating common colds.
The team's discovery is expected to spur clinical tests aimed at improving prognoses for bladder cancer patients. In the latest cancer treatments, expensive molecular-targeted drugs are used, putting a large strain on both the medical economy and the state coffers. "This latest research could pave the way for medical institutions to use flufenamic acid - a much cheaper cold drug - which has unexpectedly been proven to be effective at fighting cancers," says Dr. Shinya Tanaka of the research group.
The research was conducted in collaboration with Dr. Nobuo Shinohara of the Department of Renal and Genitourinary Surgery at Hokkaido University; the article's lead author was postgraduate student Ryuji Matsumoto.
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