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Drug Shields Mice From Emphysema
Date:12/22/2008

Experimental approach seemed to protect the animals from smoke's harmful effects, researchers say

MONDAY, Dec. 22 (HealthDay News) -- In experiments in mice, scientists have shown that a new drug may protect the animals from the respiratory damage caused by cigarettes.

The finding holds out hope for patients with chronic obstructive pulmonary disease (COPD) -- a chronic progressive lung disease involving both emphysema and chronic obstructive bronchitis.

COPD, most commonly linked to smoking, is the fourth leading cause of death in the United States and there are no effective treatments.

"Our previous studies have shown that there is a defect in Nrf2 -- a master regulator of antioxidant and detoxifying pathways -- in the lungs of COPD patients that may be involved in the severity of this disease," explained lead researcher Shyam Biswal, an associate professor at the Johns Hopkins Bloomberg School of Public Health in Baltimore.

In this study, the researchers used a novel drug molecule called CDDO-imidazole (CDDO-Im) to curb the progression of the disease by targeting the Nrf2 pathway.

"The result demonstrates that this strategy is effective in the preclinical model of emphysema," Biswal said.

The report is published in this week's online edition of the Proceedings of the National Academy of Sciences.

For the study, Biswal's team exposed mice to cigarette smoke for six months. Half the mice were treated with CDDO-Im while the other animals were not.

The researchers found that mice treated with CDDO-Im did not develop heart and lung damage while their untreated counterparts did.

Dr. Norman Edelman, chief medical officer of the American Lung Association, believes the new approach to treating COPD could be effective.

"There have been several studies identifying disrupted oxidant defense systems in COPD," Edelman said. "What's different about th
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