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To date, the etiology is not well understood and individual susceptibility\u00a0still remains\u00a0unknown. Amiodarone, chlorpromazine, amitriptyline, and trimipramine are classified lysosomotropic as well as photosensitizing, however, they fail to trigger rash and pruritic papules in all individuals. Lysosomotropism is a common charcteristic of various drugs, but independent of individuals. There is evidence that the individual ability to respond to external oxidative stress is crosslinked with the elongation of long-chain fatty acids to very long-chain fatty acids by ELOVLs. ELOVL6 and ELOVL7 are sensitive to ROS induced depletion of cellular NADPH and insufficient regeneration via the pentose phosphate pathway and mitochondrial fatty acid oxidation. Deficiency of NADPH in presence of lysosomotropic drugs promotes the synthesis of C<jats:sub>16<\/jats:sub>-ceramide in lysosomes and may contribute to emerging pruritic papules of AGEP. However, independently from a lysosomomotropic drug, severe depletion of ATP and NAD(P)H, e.g., by UV radiation or a potent photosensitizer can trigger likewise the collapse of the lysosomal transmembrane proton gradient resulting in lysosomal C<jats:sub>16<\/jats:sub>-ceramide synthesis and pruritic papules. This kind of papules are equally present in polymorphous light eruption (PMLE\/PLE) and acne aestivalis (Mallorca acne). The suggested model of a compartmentalized ceramide metabolism provides a more sophisticated explanation of cutaneous drug adverse effects and the individual sensitivity to UV radiation. Parameters such as pKa and ClogP of the triggering drug, cutaneous fatty acid profile, and ceramide profile enables new concepts in risk assessment and scoring of AGEP as well as prophylaxis outcome.<\/jats:p>","DOI":"10.1186\/s12944-021-01552-3","type":"journal-article","created":{"date-parts":[[2021,11,8]],"date-time":"2021-11-08T02:02:35Z","timestamp":1636336955000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Drug triggered pruritus, rash, papules, and blisters \u2013 is AGEP a clash of an altered sphingolipid-metabolism and lysosomotropism of drugs accumulating in the skin?"],"prefix":"10.1186","volume":"20","author":[{"given":"Markus","family":"Blaess","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lars","family":"Kaiser","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Oliver","family":"Sommerfeld","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ren\u00e9","family":"Csuk","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hans-Peter","family":"Deigner","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,11,8]]},"reference":[{"issue":"4","key":"1552_CR1","doi-asserted-by":"publisher","first-page":"283","DOI":"10.1097\/ACI.0000000000000546","volume":"19","author":"MR Ardern-Jones","year":"2019","unstructured":"Ardern-Jones MR, Mockenhaupt M. 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