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Singer P, Yee BK. The adenosine hypothesis of schizophrenia into its third decade: From neurochemical imbalance to early life etiological risks. Front Cell Neurosci 2023; 17:1120532. [PMID: 36998267 PMCID: PMC10043328 DOI: 10.3389/fncel.2023.1120532] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Accepted: 02/15/2023] [Indexed: 03/17/2023] Open
Abstract
The adenosine hypothesis of schizophrenia was conceptualized about two decades ago in an attempt to integrate two prominent theories of neurochemical imbalance that attribute the pathogenesis of schizophrenia to hyperfunction of the mesocorticolimbic dopamine neurotransmission and hypofunction of cortical glutamate neurotransmission. Given its unique position as an endogenous modulator of both dopamine and glutamate signaling in the brain, adenosine was postulated as a potential new drug target to achieve multiple antipsychotic actions. This new strategy may offer hope for improving treatment, especially in alleviating negative symptoms and cognitive deficits of schizophrenia that do not respond to current medications. To date, however, the adenosine hypothesis has yet led to any significant therapeutic breakthroughs. Here, we address two possible reasons for the impasse. First, neither the presence of adenosine functional deficiency in people with schizophrenia nor its causal relationship to symptom production has been satisfactorily examined. Second, the lack of novel adenosine-based drugs also impedes progress. This review updates the latest preclinical and clinical data pertinent to the construct validity of the adenosine hypothesis and explores novel molecular processes whereby dysregulation of adenosine signaling could be linked to the etiology of schizophrenia. It is intended to stimulate and revitalize research into the adenosine hypothesis towards the development of a new and improved generation of antipsychotic drugs that has eluded us for decades.
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Affiliation(s)
- Philipp Singer
- Roche Diagnostics International AG, Rotkreuz, Switzerland
- *Correspondence: Philipp Singer Benjamin K. Yee
| | - Benjamin K. Yee
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China
- Mental Health Research Centre, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China
- *Correspondence: Philipp Singer Benjamin K. Yee
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Uekusa S, Onozato M, Umino M, Sakamoto T, Ichiba H, Tsujino N, Funatogawa T, Tagata H, Nemoto T, Mizuno M, Fukushima T. Increased inosine levels in drug-free individuals with at-risk mental state: A serum metabolomics study. Early Interv Psychiatry 2022; 16:247-255. [PMID: 33779047 DOI: 10.1111/eip.13148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Accepted: 03/12/2021] [Indexed: 12/19/2022]
Abstract
AIM At-risk mental state (ARMS) has been recently attracting attention with respect to the improvement of the management and outcome of psychiatric diseases, such as schizophrenia. Since only a few studies have reported on biological alterations in ARMS, serum metabolomics was carried out in ARMS subjects and healthy controls using liquid chromatography with high-resolution mass spectrometry. METHODS Serum samples were collected from ARMS subjects (n = 24; male: 12; female 12) and age- and sex-matched healthy controls (n = 23 male: 11, female: 12). After serum pre-treatment, liquid chromatography with high-resolution mass spectrometry was performed. Multivariate analyses, such as orthogonal partial least-squares discriminant and volcano plot analyses, were performed. RESULTS Serum inosine, lactate, taurine, 2,3-dihydroxypropanoate and glutamate levels differed between the two groups. A significant increase in inosine levels was detected in the positive- and negative-ion modes; however, significant differences were not observed in the levels of other purine-related metabolites (hypoxanthine, xanthine and urate) between the two groups. CONCLUSION Increased inosine levels may serve as biological markers for ARMS, in addition to alterations in the levels of lactate and certain amino acids.
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Affiliation(s)
- Shusuke Uekusa
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan.,Department of Clinical Pharmacy, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Mayu Onozato
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Maho Umino
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Tatsuya Sakamoto
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Hideaki Ichiba
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Naohisa Tsujino
- Department of Psychiatry, Saiseikai Yokohamashi Tobu Hospital, Yokohama, Japan.,Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Tomoyuki Funatogawa
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Hiromi Tagata
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Takahiro Nemoto
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Masafumi Mizuno
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Takeshi Fukushima
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
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Yu M, Zhou H, Li Q, Ding J, Shuai H, Zhang J. Serum Adenosine Deaminase as a Useful Marker to Estimate Coronary Artery Calcification in Type 2 Diabetes Mellitus Patients. Clin Appl Thromb Hemost 2021; 27:1076029621999722. [PMID: 33651650 PMCID: PMC7930648 DOI: 10.1177/1076029621999722] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
We investigated the association between serum adenosine deaminase and coronary artery calcification (CAC) in type 2 diabetes mellitus (T2DM) patients. The cross-sectional study included 459 patients with T2DM, the clinical and laboratory tests were performed, and all T2DM patients were separated into the 3 groups based on the tertile of serum adenosine deaminase levels. In the baseline data, the CAC score had statistically significant differences between the 3 groups (p < 0.001). Serum adenosine deaminase levels were positively correlated with CAC score in T2DM patients (r = 0.355, p < 0.001). The results of multiple linear regression analysis showed that serum adenosine deaminase was independent positively correlated with CAC score in T2DM patients (r = 0.255, p < 0.001). Receiver-operating characteristic curve analysis showed that area under curve was 0.750 to identify T2DM patients with CAC. Serum adenosine deaminase levels are correlated with CAC scores in T2DM patients, clinically, serum adenosine deaminase should be considered as an underlying marker to determine the severity of atherosclerosis in T2DM patients.
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Affiliation(s)
- Ming Yu
- Department of General Practice, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei, China
| | - Hanyun Zhou
- Department of Cardiology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei, China
| | - Qingan Li
- Department of General Practice, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei, China
| | - Juan Ding
- Department of Endocrinology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei, China
| | - Hongxia Shuai
- Department of Endocrinology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei, China
| | - Ji Zhang
- Department of Pharmacology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei, China
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Bagheri S, Saboury AA, Haertlé T. Adenosine deaminase inhibition. Int J Biol Macromol 2019; 141:1246-1257. [PMID: 31520704 DOI: 10.1016/j.ijbiomac.2019.09.078] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 09/09/2019] [Accepted: 09/10/2019] [Indexed: 12/18/2022]
Abstract
Adenosine deaminase is a critical enzyme in purine metabolism that regulates intra and extracellular adenosine concentrations by converting it to inosine. Adenosine is an important purine that regulates numerous physiological functions by interacting with its receptors. Adenosine and consequently adenosine deaminase can have pro or anti-inflammatory effects on tissues depending on how much time has passed from the start of the injury. In addition, an increase in adenosine deaminase activity has been reported for various diseases and the significant effect of deaminase inhibition on the clinical course of different diseases has been reported. However, the use of inhibitors is limited to only a few medical indications. Data on the increase of adenosine deaminase activity in different diseases and the impact of its inhibition in various cases have been collected and are discussed in this review. Overall, the evidence shows that many studies have been done to introduce inhibitors, however, in vivo studies have been much less than in vitro, and often have not been expanded for clinical use.
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Affiliation(s)
- S Bagheri
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.
| | - A A Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
| | - T Haertlé
- Institut National de la Recherche Agronomique, Nantes, France
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