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Here we define a metabolite-driven, multi-tissue signalling system that links cold temperature to enhanced longevity and proteostasis in\n                    <jats:italic>Caenorhabditis elegans<\/jats:italic>\n                    . Cold temperature upregulates the biopterin-synthesis enzyme CAT-4 (GCH1 in humans), increasing production of dihydrobiopterin (BH2), a transportable reservoir for the bioactive cofactor tetrahydrobiopterin (BH4). BH2 is produced in muscle and transported to distal tissues, including the intestine and neurons, where it is converted into BH4 by the salvage enzyme DHFR-1. BH4 functions as an essential cofactor for phenylalanine hydroxylase PAH-1, promoting tyrosine synthesis and extending lifespan. This BH2\u2013BH4 axis also prevents disease-related protein aggregation and subsequent neuronal dysfunction during ageing. Importantly, increasing BH2 synthesis specifically in muscle is sufficient to promote longevity and suppress pathological protein aggregation in distal tissues, even at normal or elevated temperatures. In human cells, BH2 or tyrosine supplementation reduces aggregation of polyQ-expanded proteins associated with Huntington\u2019s disease, as well as mutant variants of TDP-43 and FUS that cause amyotrophic lateral sclerosis. Together, these findings identify BH2 as a cold-induced metabolite of which the synthesis, intertissue transport and conversion into bioactive BH4 preserve organism-wide proteostasis and extend lifespan.\n                  <\/jats:p>","DOI":"10.1038\/s41586-026-11152-9","type":"journal-article","created":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T15:02:15Z","timestamp":1792594935000},"page":"480-489","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Cold activates a BH2 metabolic network promoting longevity and proteostasis"],"prefix":"10.1038","volume":"659","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2660-4991","authenticated-orcid":false,"given":"Hyun Ju","family":"Lee","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cansu","family":"Do\u011fan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7937-3974","authenticated-orcid":false,"given":"Seda","family":"Koyuncu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7511-7471","authenticated-orcid":false,"given":"Markus","family":"Wehrmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Murat","family":"Artan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dunja","family":"Petrovic","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2023-2429","authenticated-orcid":false,"given":"Rute","family":"Loureiro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0063-5447","authenticated-orcid":false,"given":"Amit Kumar","family":"Sahu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joana","family":"Schnubel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6561-2276","authenticated-orcid":false,"given":"Pavel","family":"Grobushkin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dimitrios","family":"Prymidis","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Theodoros","family":"Georgomanolis","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Agnieszka","family":"Sokol","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ming","family":"Yang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4734-9352","authenticated-orcid":false,"given":"Thorsten","family":"Hoppe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3293-7397","authenticated-orcid":false,"given":"Christian","family":"Frezza","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0801-0743","authenticated-orcid":false,"given":"David","family":"Vilchez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,10,21]]},"reference":[{"key":"11152_CR1","doi-asserted-by":"publisher","first-page":"740","DOI":"10.1038\/s43587-025-00850-0","volume":"5","author":"B Conti","year":"2025","unstructured":"Conti, B. & de Cabo, R. 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