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Skin cancer prevention strategies

photolyase provides skin cancer protection

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[quote][i]Originally posted by trish[/i]
[br]Now where and how do we get this stuff?

http://stuchebrukhov.ucdavis.edu/DNA_Repair/index.html

http://www.ncbi.nlm.nih.gov/pubmed/15668165

BACKGROUND: The high and steadily increasing incidence of ultraviolet-B (UV-B)-induced skin cancer is a problem recognized worldwide. UV introduces different types of damage into the DNA, notably cyclobutane pyrimidine dimers (CPDs) and (6-4) photoproducts (6-4PPs). If unrepaired, these photolesions can give rise to cell death, mutation induction, and onset of carcinogenic events, but the relative contribution of CPDs and 6-4PPs to these biological consequences of UV exposure is hardly known. Because placental mammals have undergone an evolutionary loss of photolyases, repair enzymes that directly split CPDs and 6-4PPs into the respective monomers in a light-dependent and lesion-specific manner, they can only repair UV-induced DNA damage by the elaborate nucleotide excision repair pathway. RESULTS: To assess the relative contribution of CPDs and 6-4PPs to the detrimental effects of UV light, we generated transgenic mice that ubiquitously express CPD-photolyase, 6-4PP-photolyase, or both, thereby allowing rapid light-dependent repair of CPDs and/or 6-4PPs in the skin. We show that the vast majority of (semi)acute responses in the UV-exposed skin (i.e., sunburn, apoptosis, hyperplasia, and mutation induction) can be ascribed to CPDs. Moreover, CPD-photolyase mice, in contrast to 6-4PP-photolyase mice, exhibit superior resistance to sunlight-induced tumorigenesis. CONCLUSIONS: Our data unequivocally identify CPDs as the principal cause of nonmelanoma skin cancer and provide genetic evidence that CPD-photolyase enzymes can be employed as effective tools to combat skin cancer.

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T O P I C R E V I E W
trish	Posted - 04/27/2009 : 19:04:51 Now where and how do we get this stuff? http://stuchebrukhov.ucdavis.edu/DNA_Repair/index.html http://www.ncbi.nlm.nih.gov/pubmed/15668165 BACKGROUND: The high and steadily increasing incidence of ultraviolet-B (UV-B)-induced skin cancer is a problem recognized worldwide. UV introduces different types of damage into the DNA, notably cyclobutane pyrimidine dimers (CPDs) and (6-4) photoproducts (6-4PPs). If unrepaired, these photolesions can give rise to cell death, mutation induction, and onset of carcinogenic events, but the relative contribution of CPDs and 6-4PPs to these biological consequences of UV exposure is hardly known. Because placental mammals have undergone an evolutionary loss of photolyases, repair enzymes that directly split CPDs and 6-4PPs into the respective monomers in a light-dependent and lesion-specific manner, they can only repair UV-induced DNA damage by the elaborate nucleotide excision repair pathway. RESULTS: To assess the relative contribution of CPDs and 6-4PPs to the detrimental effects of UV light, we generated transgenic mice that ubiquitously express CPD-photolyase, 6-4PP-photolyase, or both, thereby allowing rapid light-dependent repair of CPDs and/or 6-4PPs in the skin. We show that the vast majority of (semi)acute responses in the UV-exposed skin (i.e., sunburn, apoptosis, hyperplasia, and mutation induction) can be ascribed to CPDs. Moreover, CPD-photolyase mice, in contrast to 6-4PP-photolyase mice, exhibit superior resistance to sunlight-induced tumorigenesis. CONCLUSIONS: Our data unequivocally identify CPDs as the principal cause of nonmelanoma skin cancer and provide genetic evidence that CPD-photolyase enzymes can be employed as effective tools to combat skin cancer.
1 L A T E S T R E P L I E S (Newest First)
anivoc	Posted - 04/30/2009 : 22:00:33 Wow! I wish I could say I understand all of it.. It appears there is a way to reverse a dna message which in turn reverses the bad cells which we call non melanoma skin cancer back into normal healthy cells.. Here's the full abstract http://www.box.net/shared/8xo86dm9sl It is deep heavy reading way beyond my expertise but from a laymans first impression ( I have not read the whole document ) It appears CPD's are the cause of skin cancer and blue light led (Photolyase)can change their structure back to normal cells...

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Disclaimer: The three most common types of skin cancer are basal cell carcinoma, squamous cell carcinoma, and melanoma. While melanoma is the most dangerous type, keep in mind that any cancer and potentially some cancer treatments can cause injury or death. The various views expressed in these public forums should not be considered as medical advice. See your qualified health-care professional for medical attention, advice, diagnosis, and treatments.