The Claim
In human epidermal keratinocytes, inhibition of DHCR7 reduces cholesterol synthesis and increases the availability of 7-dehydrocholesterol for 1α,25-dihydroxyvitamin D3 production, resulting in enhanced MMP-1 expression following UV exposure.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
When DHCR7 is inhibited in skin cells, cholesterol production decreases and 7-dehydrocholesterol becomes more available to produce vitamin D3, which leads to higher levels of MMP-1 protein after UV light exposure.
See the scientific wording
In human epidermal keratinocytes, inhibition of DHCR7 reduces cholesterol synthesis and increases the availability of 7-dehydrocholesterol for 1α,25-dihydroxyvitamin D3 production, leading to enhanced MMP-1 expression following UV exposure.
When skin is exposed to UV light, it stops making a cholesterol-producing enzyme, so more of a precursor molecule gets used to make vitamin D instead. This active vitamin D binds to a receptor in skin cells, which turns on a gene that breaks down collagen.
What the research says
1 studyWhen skin cells are exposed to sunlight, they make less of a cholesterol-making enzyme and more of a vitamin D-making enzyme. This shifts resources to make more vitamin D, which then triggers a protein that breaks down collagen. The study proves this chain of events happens exactly as described.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.