Kuwala kwa ultraviolet (UV), kaya kuchokera ku dzuwa lachilengedwe kapena zinthu zopangidwa monga makina opaka utoto (mabedi a dzuwa), kumakhudza kwambiri chitetezo cha mthupi cha anthu. Ngakhale kuwala pang'ono kwa UV kumathandizira kupanga vitamini D—komwe kumathandiza kuti chitetezo cha mthupi chizigwira ntchito—kuwala kwambiri, makamaka kuchokera ku zipangizo zopaka utoto, kumatha kuletsa chitetezo cha mthupi ndikuwonjezera zoopsa pa thanzi.
Kodi kuwala kwa UV kumakhudza bwanji chitetezo cha mthupi?
1. Kuwala kwa UV ndi Kusintha kwa Chitetezo cha Mthupi
A. Zotsatira Zoletsa Chitetezo cha Mthupi
Kuletsa Chitetezo cha Mthupi Chakumaloko:
Miyezo ya UVB (280–315 nm) ndi UVA (315–400 nm) imalowa pakhungu, kuwononga DNA mu ma keratinocyte ndi maselo oteteza thupi.
Izi zimayambitsa kutulutsidwa kwa ma cytokines oletsa chitetezo chamthupi (monga IL-10, TNF-α), zomwe zimachepetsa mphamvu ya khungu yolimbana ndi matenda ndi khansa.
Maselo a Langerhans (oteteza chitetezo chamthupi ofunikira pakhungu) amachepa, zomwe zimapangitsa kuti ma antigen ayambe kuchepa.
Kuletsa Chitetezo cha Mthupi:
Kuwonekera kwa UV kosatha (makamaka UVA m'malo opaka utoto) kumatha kuletsa ntchito ya maselo a T, kuchepetsa chitetezo cha thupi ku matenda ndi katemera.
Kafukufuku akuwonetsa kuti kugwiritsa ntchito kwambiri zinthu zopaka utoto pabedi kumawonjezera chiopsezo cha matenda opatsirana ndi mavairasi (monga herpes simplex, HPV) ndi matenda a pakhungu la bakiteriya.
B. Vitamini D ndi Ubwino wa Chitetezo cha Mthupi
Vitamini D yomwe imachokera ku UVB imawonjezera chitetezo chamthupi mwa kulimbikitsa kupanga ma peptide oletsa mabakiteriya (monga cathelicidin).
Komabe, makina opaka utoto nthawi zambiri amatulutsa UVA, yomwe sipanga vitamini D bwino, zomwe zimapangitsa kuti phinduli lichepe.
Kodi mphamvu ya kuwala kwa ultraviolet pa chitetezo cha mthupi ingathetsedwe bwanji mwasayansi?
1. Chepetsani kuchuluka kwa nthawi ndi nthawi yowongolera.
Kupaka utoto pakhungu sikuyenera kupitirira mphindi 10 ndipo sikuyenera kupitirira kawiri pa sabata kuti tipewe kuwonekera kwa nthawi yayitali.
2. Limbikitsani chisamaliro musanachite opaleshoni komanso mutachita opaleshoni.
Kunyowetsa ndi kugwiritsa ntchito mankhwala oletsa kutupa (vitamini C ndi E) komanso mankhwala osamalira khungu obwezeretsa thanzi kungachepetse kuwonongeka komwe kumachitika chifukwa cha kuwala kwa ultraviolet.
3. Samalani ndi kusintha kwa thupi.
Fufuzani dokotala mwamsanga ngati mukukumana ndi matenda obwerezabwereza, kuyabwa pakhungu kosazolowereka, kapena erythema, ndipo siyani kugwiritsa ntchito zinthu zopaka utoto.