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Zha Z, Wang R, Wang Q, Chen F, Ye Z, Li Y. A fast and efficient liquid chromatography-tandem mass spectrometry method for measuring l- and d-amino acids in the urine of patients with immunoglobulin A nephropathy. Biomed Chromatogr 2024; 38:e5866. [PMID: 38618866 DOI: 10.1002/bmc.5866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 01/10/2024] [Accepted: 01/11/2024] [Indexed: 04/16/2024]
Abstract
Immunoglobulin nephropathy (IgAN) stands as the most prevalent primary glomerular nephropathy globally, typically diagnosed through an invasive renal biopsy. Emerging research suggests the significant involvement of chiral amino acids in kidney disease progression. This study introduces a nonderivative LC-tandem mass spectrometry approach, offering efficient separation outcomes within 15 min for identifying chiral amino acids in human urine samples. Subsequently, using this method, the analysis of l- and d-amino acids in the urine of both patients with IgAN and healthy individuals was conducted. Fourteen d-amino acids and 20 l-amino acids were identified in the urine samples obtained from 17 patients with IgAN and 21 healthy individuals. The results indicated notable variances in the concentrations of both l- and d-amino acids between the IgAN and healthy control groups. In contrast to the healthy group, the IgAN group exhibited higher mean urine concentrations of most l-amino acids and lower concentrations of d-amino acids. Furthermore, correlations between amino acids and clinical markers were investigated. These results propose a novel method for monitoring trace amino acids in urine samples and introduce a new concept for potential markers of IgAN.
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Affiliation(s)
- Zhijian Zha
- Third Clinical School, Shanxi University of Traditional Chinese Medicine, Taiyuan City, Shanxi Province, China
| | - Ruihua Wang
- Third Clinical School, Shanxi University of Traditional Chinese Medicine, Taiyuan City, Shanxi Province, China
| | - Qian Wang
- Shanxi Provincial Key Laboratory of Kidney Disease, Taiyuan, China
| | - Fahui Chen
- Third Clinical School, Shanxi University of Traditional Chinese Medicine, Taiyuan City, Shanxi Province, China
| | - Ziyang Ye
- Third Clinical School, Shanxi University of Traditional Chinese Medicine, Taiyuan City, Shanxi Province, China
| | - Yafeng Li
- Third Clinical School, Shanxi University of Traditional Chinese Medicine, Taiyuan City, Shanxi Province, China
- Chronic Kidney Disease Medical and Pharmaceutical Basic Research Innovation Center of the Ministry of Education of the People's Republic of China, Taiyuan, China
- Department of Nephrology, Shanxi Provincial People's Hospital (Fifth Hospital), Shanxi Medical University, Taiyuan, China
- Core Laboratory, Shanxi Provincial People's Hospital (Fifth Hospital), Shanxi Medical University, Taiyuan, China
- Academy of Microbial Ecology, Shanxi Medical University, Taiyuan, China
- Hejin Municipal People's Hospital, Hejin, China
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Sakamoto T, Odera K, Onozato M, Sugasawa H, Takahashi R, Fujimaki Y, Fukushima T. Direct Fluorescence Evaluation of d-Amino Acid Oxidase Activity Using a Synthetic d-Kynurenine Derivative. Anal Chem 2022; 94:14530-14536. [PMID: 36222234 DOI: 10.1021/acs.analchem.2c00775] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
d-Amino acid oxidase (DAO) has been suggested to be associated with the central nervous system diseases, such as schizophrenia. We newly synthesized a nonfluorescent 5-methylthio-d-kynurenine (MeS-d-KYN), which was converted to blue-fluorescent 6-MeS-kynurenic acid (MeS-KYNA, λex = 364 nm, λem = 450 nm) through a one-step reaction by incubation with DAO. It was revealed that fluorescence intensity increased accompanied by commercial porcine kidney DAO activity (unit) with a good correlation (R2 = 0.9972), suggesting that the fluorometric evaluation of DAO activity using MeS-d-KYN is feasible. MeS-d-KYN was applied to fluorescent DAO imaging in cultured LLC-PK1 cells, and the blue fluorescence of MeS-KYNA overlapped considerably with the location of peroxisomes, which was suggested to be the location of DAO in the cells. Because fluorescence was diminished in the presence of 6-chloro-1,2-benzisoxazol-3(2H)-one (CBIO), a DAO inhibitor, it was considered that DAO activity in cells could be directly evaluated using MeS-d-KYN as the substrate.
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Affiliation(s)
- Tatsuya Sakamoto
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi-shi, Chiba274-8510, Japan
| | - Keiko Odera
- Department of Biochemistry, Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi-shi, Chiba274-8510, Japan
| | - Mayu Onozato
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi-shi, Chiba274-8510, Japan
| | - Hiroshi Sugasawa
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi-shi, Chiba274-8510, Japan
| | - Ryoya Takahashi
- Department of Biochemistry, Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi-shi, Chiba274-8510, Japan
| | - Yasuto Fujimaki
- Tokyo Metropolitan Industrial Technology Research Institute, Jonan Branch, 1-20-20 minamikamata, Ota-ku, Tokyo144-0035, Japan
| | - Takeshi Fukushima
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi-shi, Chiba274-8510, Japan
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