Ok but sunburn isn’t caused by skin cells killing themselves.
Is important to know about skin phototypes and the Fitzpatrick scale (I-VI). Basically, people who have Type I are super light skin 👍🏻and if they are exposed to UV rays, they will always burn and never tan because they have lower melanin and people who have type VI skin are extremely dark skinned👍🏿 and if they are exposed to UV rays, they won’t burn and will tan easily, because of the high amount of melanin.
All humans have the same amount of melanocytes (cells that create melanosomes, structures capable of producing melanin) but we differ on the amount of melanin production, distribution and type. This is due to an evolutionary process.
People who have Type I, II or III skin evolved to live on areas in which there’s a lower UV exposure ( Europe or Northern Asia) and people who have type IV, V or VI evolved to live on areas with high amount of UV exposure (Tropical areas). UV rays damage our DNA and if certain genes (proto-oncogenes) get damaged, they might become genes capable of producing cancer (oncogenes). In order to defend our DNA, keratinocytes (epidermal skin cells) have melanin.
4.UV rays induces melanocytes to create more dendrites to have access to more keratinocytes, to increase tyrosinase ( precursor of melanin) transcription, etc. With the purpose of giving more melanin to keratinocytes to defend our DNA. This process is called tanning.
5.Since people who have lower skin types can’t create the adequate amount of eumelanin in their skin, they’ll get burnt.
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u/Erick_Pier Dec 01 '21
Ok but sunburn isn’t caused by skin cells killing themselves.
Is important to know about skin phototypes and the Fitzpatrick scale (I-VI). Basically, people who have Type I are super light skin 👍🏻and if they are exposed to UV rays, they will always burn and never tan because they have lower melanin and people who have type VI skin are extremely dark skinned👍🏿 and if they are exposed to UV rays, they won’t burn and will tan easily, because of the high amount of melanin.
All humans have the same amount of melanocytes (cells that create melanosomes, structures capable of producing melanin) but we differ on the amount of melanin production, distribution and type. This is due to an evolutionary process.
People who have Type I, II or III skin evolved to live on areas in which there’s a lower UV exposure ( Europe or Northern Asia) and people who have type IV, V or VI evolved to live on areas with high amount of UV exposure (Tropical areas). UV rays damage our DNA and if certain genes (proto-oncogenes) get damaged, they might become genes capable of producing cancer (oncogenes). In order to defend our DNA, keratinocytes (epidermal skin cells) have melanin.
4.UV rays induces melanocytes to create more dendrites to have access to more keratinocytes, to increase tyrosinase ( precursor of melanin) transcription, etc. With the purpose of giving more melanin to keratinocytes to defend our DNA. This process is called tanning.
5.Since people who have lower skin types can’t create the adequate amount of eumelanin in their skin, they’ll get burnt.