{"id":7985,"date":"2021-10-14T11:46:30","date_gmt":"2021-10-14T11:46:30","guid":{"rendered":"https:\/\/jurmed.ro\/pacienti\/?p=7985"},"modified":"2021-10-14T11:48:32","modified_gmt":"2021-10-14T11:48:32","slug":"colagen","status":"publish","type":"post","link":"https:\/\/jurmed.ro\/pacienti\/colagen\/","title":{"rendered":"Mecanisme implicate \u00een \u00eemb\u0103tr\u00e2nirea cutanat\u0103"},"content":{"rendered":"<p>La \u00eenceput de secol XXI esen\u0163a \u00eemb\u0103tr\u00e2nirii umane continu\u0103 s\u0103 r\u0103m\u00e2n\u0103 o ecua\u0163ie cu multiple necunoscute. Se poate spune cu certitudine c\u0103 \u00eemb\u0103tr\u00e2nirea este un proces universal, general \u015fi ireversibil. Nu se poate vorbi \u00eens\u0103 de un singur punct de plecare al \u00eemb\u0103tr\u00e2nirii.<\/p>\n<p>Procesele \u00eemb\u0103tr\u00e2nirii trebuie \u00een\u021belese \u00eentr-un context amplu de factori \u0219i cauze. Se admite c\u0103 \u00eemb\u0103tr\u00e2nirea \u0219i durata vie\u021bii omului este determinat\u0103 de o serie de factori, printre care se num\u0103r\u0103 cei endogeni, (natura genetic\u0103) care debuteaz\u0103 \u00eenc\u0103 de la 18-20 de ani. \u00cemb\u0103tr\u00e2nirea fiziologic\u0103, genetic\u0103, se manifest\u0103 prin alterarea mesajului genetic \u00een sinteza proteinelor, degenerare celular\u0103 \u0219i prin modific\u0103ri ale structurii macromoleculelor proteice extracelulare. Varia\u021biile \u00een fondul genetic individual par s\u0103 guverneze cauza intrinsec\u0103 cu rezultate pe m\u0103sura trecerii timpului. Prin defini\u021bie, aceast\u0103 form\u0103 de \u00eemb\u0103tr\u00e2nire este inevitabil\u0103.<\/p>\n<p>Stresul oxidativ este considerat de importan\u021b\u0103 primordial\u0103 \u00een conducerea procesului de \u00eemb\u0103tr\u00e2nire. Acesta reprezint\u0103 o consecin\u021b\u0103 a lez\u0103rii radicalilor liberi de numeroase specii reactive de oxigen endogene (SRO). De\u0219i pielea are activit\u0103\u021bi antioxidante extrem de eficiente, \u00een timpul \u00eemb\u0103tr\u00e2nirii, nivelul SRO cre\u0219te \u0219i activit\u0103\u021bile antioxidante scad.<\/p>\n<p><a href=\"https:\/\/jurmed.ro\/pacienti\/wp-content\/uploads\/sites\/3\/2021\/10\/colagen.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-7986\" src=\"https:\/\/jurmed.ro\/pacienti\/wp-content\/uploads\/sites\/3\/2021\/10\/colagen-214x300.jpg\" alt=\"\" width=\"214\" height=\"300\" srcset=\"https:\/\/jurmed.ro\/pacienti\/wp-content\/uploads\/sites\/3\/2021\/10\/colagen-214x300.jpg 214w, https:\/\/jurmed.ro\/pacienti\/wp-content\/uploads\/sites\/3\/2021\/10\/colagen.jpg 322w\" sizes=\"auto, (max-width: 214px) 100vw, 214px\" \/><\/a>\u00cemb\u0103tr\u00e2nirea este asociat\u0103 cu schimb\u0103ri structurale moleculare ale ADN-ului, lipidelor \u0219i prostaglandinelor &#8211; to\u021bi markeri ai stresului oxidativ, de\u0219i toate modific\u0103rile nu sunt doar de oxidare.<\/p>\n<p>Exist\u0103 alte c\u0103i care includ erori spontane sau alte modific\u0103ri ale proteinelor. Acumularea acestor modific\u0103ri moleculare, \u00een special \u00een proteine, constituie baza \u00eemb\u0103tr\u00e2nirii celulare. Cu toate acestea, este de asemenea recunoscut faptul c\u0103 SRO joac\u0103 un rol \u00een semnalizarea normal\u0103 \u0219i c\u0103 generarea lor este esen\u021bial\u0103 pentru men\u021binerea homoeostazei \u0219i a reac\u021biei celulare.<\/p>\n<p>\u00cemb\u0103tr\u00e2nirea extrinsec\u0103 este cauzat\u0103 de factori care sunt introdu\u0219i \u00een corpul uman, cum ar fi fumatul, consumul excesiv de alcool, nutri\u021bia necorespunz\u0103toare \u0219i expunerea cronic\u0103 la soare. Expunerea la astfel de elemente, care intr\u0103 \u00een sfera domeniului voluntar, este uneori inevitabil\u0103 \u0219si reprezint\u0103, prin urmare, \u00eemb\u0103tr\u00e2nirea prematur\u0103 a pielii. Dintre ace\u0219ti factori externi expunerea la soare este considerat\u0103 a fi cea mai important\u0103 \u0219i nociv\u0103 pentru piele.<\/p>\n<p>Aproape 80% din \u00eemb\u0103tr\u00e2nirea facial\u0103 este considerat\u0103 a fi din cauza expunerii cronice la soare. Sunt prezente riduri groase \u0219i profunde, varian\u021bii mai mari de usc\u0103ciune \u0219i pigmentare neregulat\u0103, cu un con\u021binut de melanin\u0103 mai mare, dezvoltarea de celule nevice \u0219i lentigine, elastoz\u0103 pronun\u021bat\u0103, keratoze actinice \u0219i maladii neoplazice.<\/p>\n<p>Histologic, procesul de \u00eemb\u0103tr\u00e2nire este tradus prin atrofie cutanat\u0103 epidermic\u0103 \u0219i dermic\u0103, aplatizarea crestelor reticulare, aplatizarea jonc\u021biunii dermo-epidermice, sc\u0103derea coeziunii keratinocitare precum \u0219i un num\u0103r redus de fibroblaste \u0219i celule mastocitare. \u00cen plus, se observ\u0103 o cre\u0219tere a num\u0103rului de fibrile de colagen \u0219i a cre\u0219terii raportului colagen III \u00een defavoarea colagenului I.<\/p>\n<p>Fumul de \u021bigar\u0103 priveaz\u0103 celulele epidermice de oxigen \u0219i de nutrien\u021bi, componente necesare pentru o piele proaspat\u0103 \u0219i curat\u0103. Pe de alt\u0103 parte, acesta faciliteaz\u0103 apari\u021bia ridurilor datorit\u0103 faptului c\u0103 substan\u021bele chimice con\u021binute \u00een tutun interac\u021bioneaz\u0103 negativ cu elastina \u0219i colagenul din piele, substan\u021be responsabile cu tonusul \u0219i elasticitatea sa.<\/p>\n<p>Alcoolul deshidrateaz\u0103 organismul, conduc\u00e2nd la \u00eemb\u0103tr\u00e2nirea prematur\u0103 a pielii. Astfel, excesul de toxine care se acumuleaz\u0103 \u00een piele \u00eenl\u0103tur\u0103 umezeala natural\u0103, av\u00e2nd drept consecin\u0163\u0103 ridurile. Consumul frecvent de alcool poate cre\u015fte presiunea \u00een venele din zona fe\u0163ei duc\u00e2nd la apari\u0163ia acneei, capilare sparte sau comedoane. De asemenea, alcoolul priveaz\u0103 pielea de vitamina A, care este esen\u0163ial\u0103 pentru refacerea ei.<\/p>\n<p><a href=\"https:\/\/jurmed.ro\/pacienti\/wp-content\/uploads\/sites\/3\/2021\/10\/colagen-3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-7989 alignleft\" src=\"https:\/\/jurmed.ro\/pacienti\/wp-content\/uploads\/sites\/3\/2021\/10\/colagen-3-205x300.jpg\" alt=\"\" width=\"205\" height=\"300\" srcset=\"https:\/\/jurmed.ro\/pacienti\/wp-content\/uploads\/sites\/3\/2021\/10\/colagen-3-205x300.jpg 205w, https:\/\/jurmed.ro\/pacienti\/wp-content\/uploads\/sites\/3\/2021\/10\/colagen-3.jpg 310w\" sizes=\"auto, (max-width: 205px) 100vw, 205px\" \/><\/a>Printre factorii patogeni (degenerativi) implica\u021bi \u00een procesul de \u00eemb\u0103tr\u00e2nire se num\u0103r\u0103 \u0219i sc\u0103derea produc\u021biei naturale de hormoni. Microcircula\u021bia s\u00e2ngelui de la nivelul pielii este redus\u0103, depriv\u00e2nd astfel pielea de cantitatea mic\u0103 de hormoni naturali pe care corpul le produce. Cei mai studia\u021bi hormoni lega\u021bi de procesul de \u00eemb\u0103t\u00e2nire sunt hormonii sexuali feminini (estrogenul \u0219i progesteronul) \u0219i masculini (testosteronul), hormonul de cre\u0219tere (HGH), melatonina \u0219i hormonii suprarenalieni av\u00e2nd ca precursor pregnenolonul \u0219i DHEA.<\/p>\n<ul>\n<li>\u00cemb\u0103tr\u00e2nirea pielii poate fi \u00eent\u00e2rziat\u0103 semnificativ prin administrarea de estrogen. Mecanismul prin care estrogenul men\u021bine un aspect plin de tinere\u021be este dat cre\u0219terea sintezei colagenului, care este structura de sus\u021binere a pielii. Atrofia colagenului este un factor major \u00een \u00eemb\u0103tr\u00e2nirea pielii.<\/li>\n<li>Hormonul de cre\u0219tere (GH) este utilizat pe scar\u0103 larg\u0103 \u00een medicina antiaging pentru a \u00eencetini efectele \u00eemb\u0103tr\u00e2nirii. Valorile GH scad odat\u0103 cu v\u00e2rsta. Mecanisme care stau la baza unor efecte sc\u0103zute ale GH includ metabolismul redus oxidativ \u0219i stresul oxidativ sc\u0103zut, rezisten\u021ba sporit\u0103 la stres \u0219i sensibilitatea sporit\u0103 la insulin\u0103.<\/li>\n<li>Dehidroepiandrosteron (DHEA) este un hormon steroid secretat de glandele suprarenale \u0219i este precursorul hormonilor sexuali (testosteron \u0219i estrogen). Nivelul sanguin al DHEA cre\u0219te treptat p\u00e2n\u0103 la v\u00e2rsta de 20 de ani, apoi scade odat\u0103 cu v\u00e2rsta. Hormonul \u201cde longevitate\u201d are efecte \u00eempotriva \u00eemb\u0103tr\u00e2nirii, simptomele menopauzei, pierderea muscular\u0103, obezitate.<\/li>\n<\/ul>\n<p>Procesul de \u00eemb\u0103tr\u00e2nire a pielii este o parte din evolu\u021bia natural\u0103, fireasc\u0103, a \u00eentregului organism de-a lungul anilor; \u00eemb\u0103tr\u00e2nirea se manifest\u0103 prin pierderea agilit\u0103\u021bii de deplasare, suportarea mai dificil\u0103 a condi\u021biilor vitrege de mediu (c\u0103ldur\u0103, frig), cre\u0219terea susceptibilit\u0103\u021bii la diferite boli, recuperarea mai lent\u0103 dup\u0103 traumatisme, reducerea capacit\u0103\u021bii de reproducere, iar, la nivelul pielii, aceasta se manifest\u0103 prin pierderea tonusului \u0219i elasticit\u0103\u021bii, aspect de piele uscat\u0103, apari\u021bia de riduri, accentuarea \u0219anturilor \u0219i ridurilor de expresie, aspect de fa\u021b\u0103 tern\u0103 \u0219i \u201ec\u0103zut\u0103\u201d, permanent obosit\u0103. Abord\u0103rile preventive anti-\u00eemb\u0103tr\u00e2nire vizeaz\u0103 corectarea stilului de via\u021b\u0103 \u0219i obiceiuri (fumat, poluare, radia\u021bii UV, stres, nutri\u021bie, diet\u0103 \u0219i suplimente alimentare, activitate fizic\u0103, controlul s\u0103n\u0103t\u0103\u021bii generale), \u00een timp ce procedurile de re\u00eentinerire \u0219i revitalizare au ca scop principal cre\u0219terea nivelului vitalit\u0103\u021bii organelor \u0219i sistemelor, \u00eembun\u0103t\u0103\u021birea st\u0103rii psihice, cre\u0219terea rezisten\u021bei organismului \u0219i sporirea activit\u0103\u021bii sale; aceasta se manifest\u0103 printr-o piele ferm\u0103, privire str\u0103lucitoare, statur\u0103 dreapt\u0103, mers u\u0219or, curaj, somn lini\u0219tit \u0219i odihnitor. Tratamentele antiaging au rolul de a \u00eencetini procesul de \u00eemb\u0103tr\u00e2nire, de a ob\u021bine o fa\u021b\u0103 mai tonic\u0103, mai luminoas\u0103, f\u0103r\u0103 riduri sau cu mai pu\u021bine riduri, o fa\u021b\u0103 nu neap\u0103rat care s\u0103 fie mult mai t\u00e2n\u0103r\u0103, dar care s\u0103 arat\u0103 mai bine.<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p>Autori:<\/p>\n<p><strong>Anca ZBRANCA TOPORA\u0218<sup>1,2<\/sup>, Anca BULAI<sup>1<\/sup>,<br \/>\nClaudia-Elena AANU\u021aEI<sup>1<\/sup>, <\/strong><\/p>\n<p><strong><sup>1<\/sup><\/strong> Clinica de Dermatologie<br \/>\nSp.Cl. Jud. \u201eSf. Spiridon\u201d Ia\u0219i<\/p>\n<p><strong><sup>2<\/sup><\/strong> UMF \u201eGr. T. Popa\u201d Ia\u0219i<\/p>\n<p><strong>Bibliografie:<\/strong><\/p>\n<ol>\n<li>Bernstein EF, Underhill CB, Hahn PJ, Brown DB, Uitto J. Chronic sun exposure alters both the content and distribution of dermal glycosaminoglycans. Br J Dermatol 1996;135(2):255\u2013262Fenske NA, Lober CW. Structural and functional changes of normal aging skin. J Am Acad Dermatol 1986;15(4, pt1):571\u2013585Kosmadaki MG, Gilchrest BA. The role of telomeres in skin aging\/photoaging. Micron 2004;35(3):155\u2013159<\/li>\n<li>L Baumann, Skin ageing and its treatment, J Pathol 2007; 211: 241\u2013251; T. M. Callaghan, K.-P. Wilhelm, A review of ageing and an examination of clinical methods in the assessment of ageing skin. Part I:Cellular and molecular perspectives of skin ageing, International Journal of Cosmetic Science, 2008, 30, 313\u2013322;<\/li>\n<li>Molecular aspects of skin ageing.Naylor EC1, Watson RE, Sherratt MJ, Maturitas. 2011 Jul;69(3):249-56<\/li>\n<li>Structural and functional changes of normal aging skin. J Am Acad Dermatol 1986;15(4, pt 1):571\u2013585; Roupe G. Skin of the aging human being. Lakartidningen. 2001;98(10):1091\u20131095<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>La \u00eenceput de secol XXI esen\u0163a \u00eemb\u0103tr\u00e2nirii umane continu\u0103 s\u0103 r\u0103m\u00e2n\u0103 o ecua\u0163ie cu multiple necunoscute. Se poate spune cu certitudine c\u0103 \u00eemb\u0103tr\u00e2nirea este un proces universal, general \u015fi ireversibil. [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":7987,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[486],"tags":[],"class_list":["post-7985","post","type-post","status-publish","format-standard","has-post-thumbnail","category-dermato-cosmetica"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mecanisme implicate \u00een \u00eemb\u0103tr\u00e2nirea cutanat\u0103 - Jurmed - Pacienti<\/title>\n<meta name=\"description\" content=\"\u00cemb\u0103tr\u00e2nirea este un proces universal, general \u015fi ireversibil. 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