{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,20]],"date-time":"2026-02-20T21:59:58Z","timestamp":1771624798280,"version":"3.50.1"},"reference-count":67,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2024,2,7]],"date-time":"2024-02-07T00:00:00Z","timestamp":1707264000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"MEXT\/JSPS","award":["JP15K08265"],"award-info":[{"award-number":["JP15K08265"]}]},{"name":"MEXT\/JSPS","award":["JP16KK0202"],"award-info":[{"award-number":["JP16KK0202"]}]},{"name":"Suzuken Memorial Foundation","award":["JP15K08265"],"award-info":[{"award-number":["JP15K08265"]}]},{"name":"Suzuken Memorial Foundation","award":["JP16KK0202"],"award-info":[{"award-number":["JP16KK0202"]}]},{"name":"Takeda Science Foundation","award":["JP15K08265"],"award-info":[{"award-number":["JP15K08265"]}]},{"name":"Takeda Science Foundation","award":["JP16KK0202"],"award-info":[{"award-number":["JP16KK0202"]}]},{"name":"Mizutani Research Foundation","award":["JP15K08265"],"award-info":[{"award-number":["JP15K08265"]}]},{"name":"Mizutani Research Foundation","award":["JP16KK0202"],"award-info":[{"award-number":["JP16KK0202"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>We recently showed that 6-sulfo sialyl N-acetyllactosamine (LacNAc) in O-linked glycans recognized by the CL40 antibody is abundant in the pleural mesothelium under physiological conditions and that these glycans undergo complementary synthesis by GlcNAc6ST2 (encoded by Chst4) and GlcNAc6ST3 (encoded by Chst5) in mice. GlcNAc6ST3 is essential for the synthesis of R-10G-positive keratan sulfate (KS) in the brain. The predicted minimum epitope of the R-10G antibody is a dimeric asialo 6-sulfo LacNAc. Whether R-10G-reactive KS\/sulfated LacNAc oligosaccharides are also present in the pleural mesothelium was unknown. The question of which GlcNAc6STs are responsible for R-10G-reactive glycans was an additional issue to be clarified. Here, we show that R-10G-reactive glycans are as abundant in the pulmonary pleura as CL40-reactive glycans and that GlcNAc6ST3 is only partially involved in the synthesis of these pleural R-10G glycans, unlike in the adult brain. Unexpectedly, GlcNAc6ST2 is essential for the synthesis of R-10G-positive KS\/sulfated LacNAc oligosaccharides in the lung pleura. The type of GlcNAc6ST and the magnitude of its contribution to KS glycan synthesis varied among tissues in vivo. We show that GlcNAc6ST2 is required and sufficient for R-10G-reactive KS synthesis in the lung pleura. Interestingly, R-10G immunoreactivity in KSGal6ST (encoded by Chst1) and C6ST1 (encoded by Chst3) double-deficient mouse lungs was markedly increased. MUC16, a mucin molecule, was shown to be a candidate carrier protein for pleural R-10G-reactive glycans. These results suggest that R-10G-reactive KS\/sulfated LacNAc oligosaccharides may play a role in mesothelial cell proliferation and differentiation. Further elucidation of the functions of sulfated glycans synthesized by GlcNAc6ST2 and GlcNAc6ST3, such as R-10G and CL40 glycans, in pathological conditions may lead to a better understanding of the underlying mechanisms of the physiopathology of the lung mesothelium.<\/jats:p>","DOI":"10.3390\/molecules29040764","type":"journal-article","created":{"date-parts":[[2024,2,7]],"date-time":"2024-02-07T06:12:58Z","timestamp":1707286378000},"page":"764","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["GlcNAc6ST2\/CHST4 Is Essential for the Synthesis of R-10G-Reactive Keratan Sulfate\/Sulfated N-Acetyllactosamine Oligosaccharides in Mouse Pleural Mesothelium"],"prefix":"10.3390","volume":"29","author":[{"given":"Yoshiko","family":"Takeda-Uchimura","sequence":"first","affiliation":[{"name":"Univ. Lille, CNRS, UMR 8576\u2014UGSF\u2014Unit\u00e9 de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3629-3629","authenticated-orcid":false,"given":"Midori","family":"Ikezaki","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, School of Medicine, Wakayama Medical University, Wakayama 641-8509, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4248-6929","authenticated-orcid":false,"given":"Tomoya O.","family":"Akama","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, Kansai Medical University, Osaka 570-8506, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8674-5681","authenticated-orcid":false,"given":"Yoshito","family":"Ihara","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, School of Medicine, Wakayama Medical University, Wakayama 641-8509, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4484-6302","authenticated-orcid":false,"given":"Fabrice","family":"Allain","sequence":"additional","affiliation":[{"name":"Univ. Lille, CNRS, UMR 8576\u2014UGSF\u2014Unit\u00e9 de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3056-8310","authenticated-orcid":false,"given":"Kazuchika","family":"Nishitsuji","sequence":"additional","affiliation":[{"name":"Univ. Lille, CNRS, UMR 8576\u2014UGSF\u2014Unit\u00e9 de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France"},{"name":"Department of Biochemistry, School of Medicine, Wakayama Medical University, Wakayama 641-8509, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3009-248X","authenticated-orcid":false,"given":"Kenji","family":"Uchimura","sequence":"additional","affiliation":[{"name":"Univ. Lille, CNRS, UMR 8576\u2014UGSF\u2014Unit\u00e9 de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,2,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"559","DOI":"10.1016\/j.it.2006.10.007","article-title":"Sulfated L-selectin ligands as a therapeutic target in chronic inflammation","volume":"27","author":"Uchimura","year":"2006","journal-title":"Trends Immunol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"423","DOI":"10.1016\/j.ajpath.2010.11.009","article-title":"Functional contributions of N- and O-glycans to L-selectin ligands in murine and human lymphoid organs","volume":"178","author":"Singer","year":"2011","journal-title":"Am. J. 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