New drug may block sun-related skin ageing

TORONTO, Dec 21:  Scientists are developing a drug that could ultimately prevent the gradual ageing of the skin, which is mostly caused by sun exposure.
Researchers at the University of British Columbia and Providence Health Care in Canada have genetically engineered mice with less wrinkled skin, despite repeated exposure to wrinkle-inducing ultraviolet (UV) light.
The findings raise hope for a drug that would block the activity of Granzyme B in certain places, and thus prevent the ageing and deterioration of tissues that depend on collagen – not just skin, but blood vessels and lung passages, researchers said.
A company, named viDA Therapeutics, co-founded by David Granville, a professor in the Department of Pathology and Laboratory Medicine and a principal investigator in the Centre for Heart Lung Innovation of UBC, and St Paul’s Hospital, is currently developing a Granzyme-B inhibitor based on technology licensed from UBC.
The company plans to test a topically applied drug within two years on people with discoid lupus erythematosus, an autoimmune disease worsened by sunlight that can lead to disfiguring facial scarring.
If the drug proves effective in preventing lupus-related skin lesions, there is potential for a cosmetic product to prevent the normal, gradual ageing of the skin, which is mostly caused by sun exposure.
The drug might also be used for life-threatening conditions, such as aneurysms and chronic obstructive pulmonary disease, caused by the breakdown of collagen and other proteins that provide structure to blood vessels and lung passages.
The discovery was made possible when Granville was investigating the role of Granzyme B in atherosclerosis and heart attacks.
He and his team wanted to see if the blood vessels of mice lacking Granzyme B were more resistant to hardening and narrowing, which is a major cause of heart attacks in human.
In the process, they discovered that such mice retained youthful-looking skin compared to the aged skin on normal mice.
Granville’s team constructed a device to simulate sun exposure on mice. Each mouse was put in a carousel that slowly turned under UV lamps, exposing them for three to four minutes, three times a week – enough to cause redness, but not to burn.
After 20 weeks of repetitive exposure, it became clear that the skin of mice lacking Granzyme B had aged much less – and their collagen was more intact – compared to the control groups.
The findings were published in the journal Aging Cell. (AGENCIES)


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