{"id":771,"date":"2021-07-14T13:28:13","date_gmt":"2021-07-14T05:28:13","guid":{"rendered":"https:\/\/vitiligo.skinmedical.com.hk\/pathogenesis\/"},"modified":"2026-08-15T15:48:07","modified_gmt":"2026-08-15T07:48:07","slug":"pathogenesis","status":"publish","type":"page","link":"https:\/\/vitiligo.skinmedical.com.hk\/en\/pathogenesis\/","title":{"rendered":"Pathology"},"content":{"rendered":"<div class=\"vce-row-container\" data-vce-boxed-width=\"true\"><div class=\"vce-row vce-row--col-gap-30 vce-row-equal-height vce-row-content--top\" id=\"el-8464e2ef\" data-vce-do-apply=\"all el-8464e2ef\"><div class=\"vce-content-background-container\"><\/div><div class=\"vce-row-content\" data-vce-element-content=\"true\"><div class=\"vce-col vce-col--md-66-66p vce-col--xs-1 vce-col--xs-last vce-col--xs-first vce-col--sm-last vce-col--sm-first vce-col--md-last vce-col--lg-last vce-col--xl-last vce-col--md-first vce-col--lg-first vce-col--xl-first\" id=\"el-80f338e9\"><div class=\"vce-col-inner\" data-vce-do-apply=\"border margin background  el-80f338e9\"><div class=\"vce-col-content\" data-vce-element-content=\"true\" data-vce-do-apply=\"padding el-80f338e9\"><div class=\"vce-text-block\"><div class=\"vce-text-block-wrapper vce\" id=\"el-6837dca3\" data-vce-do-apply=\"all el-6837dca3\"><h2><span style=\"color: #808080;\">Pathology<\/span><\/h2>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><div class=\"vce-row-container\" data-vce-boxed-width=\"true\"><div class=\"vce-row vce-row--col-gap-30 vce-row-equal-height vce-row-content--top\" id=\"el-60014ce8\" data-vce-do-apply=\"all el-60014ce8\"><div class=\"vce-row-content\" data-vce-element-content=\"true\"><div class=\"vce-col vce-col--md-auto vce-col--xs-1 vce-col--xs-last vce-col--xs-first vce-col--sm-last vce-col--sm-first vce-col--md-last vce-col--lg-last vce-col--xl-last vce-col--md-first vce-col--lg-first vce-col--xl-first\" id=\"el-fcccd3a0\"><div class=\"vce-col-inner\" data-vce-do-apply=\"border margin background  el-fcccd3a0\"><div class=\"vce-col-content\" data-vce-element-content=\"true\" data-vce-do-apply=\"padding el-fcccd3a0\"><div class=\"vce vce-separator-container vce-separator--align-center vce-separator--style-solid\" id=\"el-66fb4358\" data-vce-do-apply=\"margin el-66fb4358\"><div class=\"vce-separator vce-separator--color-bfc0c1 vce-separator--width-100 vce-separator--thickness-1\" data-vce-do-apply=\"border padding background  el-66fb4358\"><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><div class=\"vce-row-container\" data-vce-boxed-width=\"true\"><div class=\"vce-row vce-row--col-gap-30 vce-row-equal-height vce-row-content--top\" id=\"el-11217c43\" data-vce-do-apply=\"all el-11217c43\"><div class=\"vce-content-background-container\"><\/div><div class=\"vce-row-content\" data-vce-element-content=\"true\"><div class=\"vce-col vce-col--md-70-78p vce-col--xs-1 vce-col--xs-last vce-col--xs-first vce-col--sm-last vce-col--sm-first vce-col--md-first vce-col--lg-first vce-col--xl-first\" id=\"el-cf54e3f9\"><div class=\"vce-col-inner\" data-vce-do-apply=\"border margin background  el-cf54e3f9\"><div class=\"vce-col-content\" data-vce-element-content=\"true\" data-vce-do-apply=\"padding el-cf54e3f9\"><div class=\"vce-text-block\"><div class=\"vce-text-block-wrapper vce\" id=\"el-bc26d538\" data-vce-do-apply=\"all el-bc26d538\"><p><span style=\"color: #756464;\">To this day, we do not yet fully understand the exact causes of vitiligo. What is known is that vitiligo is a functional disorder resulting in the loss of functional melanocytes, which can be triggered by multiple factors. Identified causes include genetics, autoimmune responses, oxidative stress, the generation of inflammatory mediators, and melanocyte detachment mechanisms. Both innate and acquired triggers can be involved, or they may coexist.<\/span><\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"vce-col vce-col--md-29-22p vce-col--xs-1 vce-col--xs-last vce-col--xs-first vce-col--sm-last vce-col--sm-first vce-col--md-last vce-col--lg-last vce-col--xl-last\" id=\"el-7eb276ac\"><div class=\"vce-col-inner\" data-vce-do-apply=\"border margin background  el-7eb276ac\"><div class=\"vce-col-content\" data-vce-element-content=\"true\" data-vce-do-apply=\"padding el-7eb276ac\"><div class=\"vce-single-image-container vce-single-image--align-center\"><div class=\"vce vce-single-image-wrapper\" id=\"el-50d1e414\" data-vce-do-apply=\"all el-50d1e414\"><figure><div class=\"vce-single-image-figure-inner\" style=\"width: 183px;\"><div class=\"vce-single-image-inner vce-single-image--absolute vce-image-filter--hudson\" style=\"width: 100%; padding-bottom: 98.3607%;\"><img loading=\"lazy\" decoding=\"async\" class=\"vce-single-image\"  width=\"183\" height=\"180\" srcset=\"https:\/\/vitiligo.skinmedical.com.hk\/wp-content\/uploads\/2026\/08\/Vitiligo_hand-183x180.jpg 183w\" src=\"https:\/\/vitiligo.skinmedical.com.hk\/wp-content\/uploads\/2026\/08\/Vitiligo_hand-183x180.jpg\" data-img-src=\"https:\/\/vitiligo.skinmedical.com.hk\/wp-content\/uploads\/2021\/07\/Vitiligo_hand.jpg\" data-attachment-id=\"88\"  alt=\"\" title=\"Vitiligo_hand\" \/><\/div><\/div><figcaption hidden=\"\"><\/figcaption><\/figure><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><div class=\"vce-row-container\" data-vce-boxed-width=\"true\"><div class=\"vce-row vce-row--col-gap-30 vce-row-equal-height vce-row-content--top\" id=\"el-4846eb8a\" data-vce-do-apply=\"all el-4846eb8a\"><div class=\"vce-content-background-container\"><\/div><div class=\"vce-row-content\" data-vce-element-content=\"true\"><div class=\"vce-col vce-col--md-auto vce-col--xs-1 vce-col--xs-last vce-col--xs-first vce-col--sm-last vce-col--sm-first vce-col--md-last vce-col--lg-last vce-col--xl-last vce-col--md-first vce-col--lg-first vce-col--xl-first\" id=\"el-21a500a8\"><div class=\"vce-col-inner\" data-vce-do-apply=\"border margin background  el-21a500a8\"><div class=\"vce-col-content\" data-vce-element-content=\"true\" data-vce-do-apply=\"padding el-21a500a8\"><div class=\"vce-text-block\"><div class=\"vce-text-block-wrapper vce\" id=\"el-69ba718d\" data-vce-do-apply=\"all el-69ba718d\"><p><span style=\"color: #756464;\"><strong> Familial and Genetic Factors<\/strong><br>\nApproximately 30% of patients have a family history of the condition, which may involve multiple gene variations. These variations may also overlap with those of other autoimmune diseases, such as thyroid disorders, type 1 diabetes, and rheumatoid arthritis. Patients should undergo blood tests and medical evaluations to confirm the presence of any concurrent autoimmune diseases.<\/span><\/p>\n<\/div><\/div><div class=\"vce-text-block\"><div class=\"vce-text-block-wrapper vce\" id=\"el-c912cc71\" data-vce-do-apply=\"all el-c912cc71\"><p><span style=\"color: #756464;\"><strong>Oxidative Stress and Melanocyte Abnormalities<\/strong><br>Melanocytes in vitiligo patients are more susceptible to oxidative stress, leading to the release of reactive oxygen species (ROS). ROS are harmful; their accumulation induces DNA damage, protein oxidation and fragmentation, and lipid peroxidation. This disrupts normal cellular functions and triggers a cascade of imbalances in antioxidant mechanisms. Consequently, the melanocytes of vitiligo patients become increasingly fragile and sensitive. Both external and internal stressors can trigger vitiligo:<\/span><\/p><p><span style=\"color: #756464;\"><strong>External Stressors<\/strong>: Include ultraviolet radiation and monobenzone (an organic compound that destroys melanocytes, causing permanent depigmentation).<\/span><\/p><p><span style=\"color: #756464;\"><strong>Internal Stressors<\/strong>: Include the production of large amounts of misfolded proteins during melanogenesis, dysregulated melanocyte autophagy, the loss of the nuclear factor E2-related factor 2 (Nrf2) pathway's protective function against oxidative stress, and mitochondrial dysfunction. Mitochondria are vital powerhouses of the human body, supplying the essential energy required for normal cellular function. Mitochondrial dysfunction leads to increased ROS-induced cellular damage and triggers melanocyte apoptosis in cells that heavily rely on mitochondrial function.<\/span><\/p><p>&nbsp;<\/p><p><strong><span style=\"color: #756464;\">Immune Response and Inflammation<\/span><\/strong><\/p><p><span style=\"color: #756464;\">Oxidative stress places pressure on both stressed melanocytes and stressed keratinocytes, prompting them to release pro-inflammatory factors that recruit T cells to the white patch lesions on the skin. Both the innate and adaptive immune systems are closely linked to the pathogenesis of vitiligo, with cytotoxic CD8+ T cells considered the primary culprits that attack and destroy melanocytes. Active T cells can be found in the skin lesions of patients, continuously attacking melanocytes. Even after white patches form, T cells persist within the skin, hindering the recovery and regeneration of melanocytes.<\/span><\/p><p><span style=\"color: #756464;\">Various pro-inflammatory cytokines are derived through CD8+ T cells at the vitiligo lesions, including interferon-\u03b3-induced CXCL9, CXCL10, and CXCL11:<\/span><\/p><p><span style=\"color: #756464;\"><strong>CXCL9<\/strong> promotes the accumulation of a large number of T cells at the lesion sites.<\/span><\/p><p><span style=\"color: #756464;\"><strong>CXCL10<\/strong> pinpoints the location of melanocytes for T cell attacks.<\/span><\/p><p>&nbsp;<\/p><p><span style=\"color: #756464;\">Research has found that neutralizing CXCL10 can induce repigmentation in vitiligo lesions. In animal studies, targeting CXCR3 (the receptor for CXCL9 and CXCL10) successfully reduced T cell numbers and reversed vitiligo conditions.<\/span><\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><div class=\"vce-row-container\" data-vce-boxed-width=\"true\"><div class=\"vce-row vce-row--col-gap-30 vce-row-equal-height vce-row-content--top\" id=\"el-3f8bd807\" data-vce-do-apply=\"all el-3f8bd807\"><div class=\"vce-content-background-container\"><\/div><div class=\"vce-row-content\" data-vce-element-content=\"true\"><div class=\"vce-col vce-col--md-auto vce-col--xs-1 vce-col--xs-last vce-col--xs-first vce-col--sm-last vce-col--sm-first vce-col--md-last vce-col--lg-last vce-col--xl-last vce-col--md-first vce-col--lg-first vce-col--xl-first\" id=\"el-2feb5d74\"><div class=\"vce-col-inner\" data-vce-do-apply=\"border margin background  el-2feb5d74\"><div class=\"vce-col-content\" data-vce-element-content=\"true\" data-vce-do-apply=\"padding el-2feb5d74\"><div class=\"vce-text-block\"><div class=\"vce-text-block-wrapper vce\" id=\"el-31aff9ff\" data-vce-do-apply=\"all el-31aff9ff\"><span style=\"line-height: inherit;\"><span style=\"color: #756464; font-size: 12pt;\">Reference:<\/span><br><span style=\"line-height: inherit;\"><span style=\"color: #756464; font-size: 12pt;\">Bergqvist C, Ezzedine K. Vitiligo: A focus on pathogenesis and its therapeutic implications. J Dermatol. 2021 Mar; 48(3):252-270.<\/span><br><span style=\"line-height: inherit;\"><span style=\"color: #756464; font-size: 12pt;\">Mohammad TF, Al-Jamal M, Hamzavi IH, et al. The Vitiligo Working Group recommendations for narrowband ultraviolet B light phototherapy treatment of vitiligo. J Am Acad Dermatol. 2017;76:879\u2013888.<\/span><br><span style=\"line-height: inherit;\"><span style=\"color: #756464; font-size: 12pt;\">Global Vitiligo Foundation (GVF)(formerly Vitiligo Working Group) - https:\/\/globalvitiligofoundation.org\/<\/span><br><span style=\"line-height: inherit;\"><span style=\"color: #756464; font-size: 12pt;\">The NHS website - https:\/\/www.nhs.uk\/conditions\/vitiligo\/<\/span><br><span style=\"line-height: inherit;\"><span style=\"color: #756464; font-size: 12pt;\">Vitiligo Society UK - https:\/\/vitiligosociety.org\/<\/span><br><span style=\"line-height: inherit;\"><span style=\"color: #756464; font-size: 12pt;\">The American Vitiligo Research Foundation, Inc.(AVRF) - https:\/\/www.avrf.org\/<\/span><br><span style=\"line-height: inherit;\"><span style=\"color: #756464; font-size: 12pt;\">National Vitiligo Bond Inc Foundation - http:\/\/vitiligobond.org\/<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Pathology To this day, we do not yet fully understand the exact causes of vitiligo. What is known is that vitiligo is a functional disorder resulting in the loss of functional melanocytes, which can be triggered by multiple factors. Identified causes include genetics, autoimmune responses, oxidative stress, the generation of inflammatory mediators, and melanocyte detachment&hellip; <a class=\"more-link\" href=\"https:\/\/vitiligo.skinmedical.com.hk\/en\/pathogenesis\/\">Continue reading <span class=\"screen-reader-text\">Pathology<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-771","page","type-page","status-publish","hentry","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u767d\u8755\u75c5\u7406 | \u91ab\u5b78\u6cbb\u7642\u767d\u8755 \u53ca\u65e9\u9632\u7bc4\u6f2b\u5ef6<\/title>\n<meta name=\"description\" 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