{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T13:46:49Z","timestamp":1791985609549,"version":"4.4.0"},"reference-count":36,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2026,9,19]],"date-time":"2026-09-19T00:00:00Z","timestamp":1789776000000},"content-version":"vor","delay-in-days":18,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T00:00:00Z","timestamp":1788220800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["EXC 2145 SyNergy \u2013 ID 390857198"],"award-info":[{"award-number":["EXC 2145 SyNergy \u2013 ID 390857198"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100005713","name":"Technische Universit\u00e4t M\u00fcnchen","doi-asserted-by":"publisher","award":["project H\u201013"],"award-info":[{"award-number":["project H\u201013"]}],"id":[{"id":"10.13039\/501100005713","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Euro J of Neurology"],"published-print":{"date-parts":[[2026,9]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Chitinases, including chitotriosidase (CHIT1) and chitinase\u20103\u2010like protein 1 (CHI3L1), are markers of neuroinflammation, a key process in amyotrophic lateral sclerosis (ALS). Tear fluid (TF) can be collected non\u2010invasively and may represent a promising alternative to CSF or blood to study chitinases.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>TF was collected from 50 ALS patients and 50 control subjects using Schirmer strips. CHIT1 and CHI3L1 levels in TF, serum, and CSF were quantified using ELISA. Serum NfL was measured using SIMOA. The frequency of a 24\u2009bp\u2010duplication polymorphism in the CHIT1 gene influencing CHIT1 expression was assessed by PCR.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      No group differences in the distribution of the CHIT1 polymorphism were detected. Carriers of the polymorphism in both ALS and controls showed lower CHIT1 levels in serum and TF. CHI3L1 levels in TF were higher in ALS patients compared to controls (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.007), consistent with changes in CSF but not serum. In ALS, males showed higher TF CHIT1 values compared to females (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.009). Combining TF chitinase values with serum NfL values improved discrimination between ALS and controls.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Chitinases are detectable in TF, and CHI3L1 levels recapitulate changes observed in CSF, highlighting its potential for non\u2010invasive longitudinal assessment. Furthermore, chitinase values in TF, together with serum NfL, may act complementarily by capturing distinct aspects of the disease, neuroinflammation and axonal damage. These results suggest TF chitinases and serum NfL could complementarily contribute to the diagnosis and monitoring of the disease, and call for further evaluation of TF as a biomarker source in ALS.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/ene.70757","type":"journal-article","created":{"date-parts":[[2026,9,19]],"date-time":"2026-09-19T07:21:07Z","timestamp":1789802467000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Chitinases in Tear Fluid of Patients With Amyotrophic Lateral Sclerosis"],"prefix":"10.1111","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-1719-0447","authenticated-orcid":false,"given":"Lara","family":"Wenz","sequence":"first","affiliation":[{"name":"Department of Neurology, Klinikum Rechts der Isar, TUM Universit\u00e4tsklinikum, School of Medicine and Health Technical University of Munich  Munich 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