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Hao T, Mi T, Chu Q, Ma W, Cheng X, Zang Y, Li J, Li T. Stereospecific Synthesis and Biological Evaluation of KRN7000 Analogues with Thio-modifications at the Acyl Moiety. ACS Med Chem Lett 2024; 15:1102-1108. [PMID: 39015265 PMCID: PMC11247626 DOI: 10.1021/acsmedchemlett.4c00199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 05/22/2024] [Accepted: 06/03/2024] [Indexed: 07/18/2024] Open
Abstract
α-Galactosylceramide (KRN7000 or α-GalCer) analogues terminated with phenyl (Ph) groups at the acyl moiety possess more potency than KRN7000 to activate invariant natural killer T (iNKT) cells for inducing a T helper 1 (Th1)-biased immune response. However, biological activities of phenyl glycolipids with thio-modifications at the acyl moiety remain unknown, and facile approaches for highly stereoselective synthesis of KRN7000 and its analogues are rather scarce. Herein, we exploited 4,6-di-O-tert-butylsilylene (DTBS)-directed stereospecific galactosylation to efficiently synthesize various α-GalCer analogues bearing thioamide, terminal thiophenyl and dual modifications at the acyl moiety. Biological evaluations suggest that a new analogue S34 featuring a terminal Ph-S-Ph-F group exhibits a more superior Th1-biased immune response in mice. Molecular docking analysis revealed that the introduction of a sulfur atom influences vital hydrogen bonding interactions between glycolipids and the cluster of differentiation 1d (CDld), thus adjusting the stability of the glycolipid-CDld complex.
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Affiliation(s)
- Tianhui Hao
- State
Key Laboratory of Chemical Biology, Shanghai Institute of Materia
Medica, Chinese Academy of Sciences, Shanghai 201203, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
| | - Tian Mi
- State
Key Laboratory of Chemical Biology, Shanghai Institute of Materia
Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Qinyu Chu
- University
of Chinese Academy of Sciences, Beijing 100049, China
- State
Key Laboratory of Drug Research, Shanghai
Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
- School
of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, University of Chinese Academy
of Sciences, Hangzhou 310024, China
| | - Wenjing Ma
- State
Key Laboratory of Chemical Biology, Shanghai Institute of Materia
Medica, Chinese Academy of Sciences, Shanghai 201203, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
| | - Xi Cheng
- University
of Chinese Academy of Sciences, Beijing 100049, China
- State
Key Laboratory of Drug Research, Shanghai
Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
- School
of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, University of Chinese Academy
of Sciences, Hangzhou 310024, China
| | - Yi Zang
- Lingang
Laboratory, Shanghai 200031, China
| | - Jia Li
- State
Key Laboratory of Chemical Biology, Shanghai Institute of Materia
Medica, Chinese Academy of Sciences, Shanghai 201203, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
- School
of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, University of Chinese Academy
of Sciences, Hangzhou 310024, China
| | - Tiehai Li
- State
Key Laboratory of Chemical Biology, Shanghai Institute of Materia
Medica, Chinese Academy of Sciences, Shanghai 201203, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
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