1
|
Oluwatoba DS, Safoah HA, Do TD. The rise and fall of adenine clusters in the gas phase: a glimpse into crystal growth and nucleation. Anal Bioanal Chem 2024; 416:5037-5048. [PMID: 39031229 DOI: 10.1007/s00216-024-05442-2] [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: 05/24/2024] [Revised: 06/27/2024] [Accepted: 07/05/2024] [Indexed: 07/22/2024]
Abstract
The emergence of a crystal nucleus from disordered states is a critical and challenging aspect of the crystallization process, primarily due to the extremely short length and timescales involved. Methods such as liquid-cell or low-dose focal-series transmission electron microscopy (TEM) are often employed to probe these events. In this study, we demonstrate that ion mobility spectrometry-mass spectrometry (IMS-MS) offers a complementary and insightful perspective on the nucleation process by examining the sizes and shapes of small clusters, specifically those ranging from n = 2 to 40. Our findings reveal the significant role of sulfate ions in the growth of adeninediium sulfate clusters, which are the precursors to the formation of single crystals. Specifically, sulfate ions stabilize adenine clusters at the 1:1 ratio. In contrast, guanine sulfate forms smaller clusters with varied ratios, which become stable as they approach the 1:2 ratio. The nucleation size is predicted to be between n = 8 and 14, correlating well with the unit cell dimensions of adenine crystals. This correlation suggests that IMS-MS can identify critical nucleation sizes and provide valuable structural information consistent with established crystallographic data. We also discuss the strengths and limitations of IMS-MS in this context. IMS-MS offers rapid and robust experimental protocols, making it a valuable tool for studying the effects of various additives on the assembly of small molecules. Additionally, it aids in elucidating nucleation processes and the growth of different crystal polymorphs.
Collapse
Affiliation(s)
| | - Happy Abena Safoah
- Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA
| | - Thanh D Do
- Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.
| |
Collapse
|
2
|
Xiao D, Shi C, Zhang Y, Li S, Ye Y, Yuan G, Miu T, Ma H, Diao S, Su C, Li Z, Li H, Zhuang G, Wang Y, Lu F, Gu X, Zhou W, Xiao X, Huang W, Wei T, Hao H. Using metabolic abnormalities of carriers in the neonatal period to evaluate the pathogenicity of variants of uncertain significance in methylmalonic acidemia. Front Genet 2024; 15:1403913. [PMID: 39076170 PMCID: PMC11284102 DOI: 10.3389/fgene.2024.1403913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Accepted: 05/28/2024] [Indexed: 07/31/2024] Open
Abstract
Objective To accurately verify the pathogenicity of variants of uncertain significance (VUS) in MUT and MMACHC genes through mass spectrometry and silico analysis. Methods This multicenter retrospective study included 35 participating units (ClinicalTrials.gov ID: NCT06183138). A total of 3,071 newborns (within 7 days of birth) were sorted into carrying pathogenic/likely pathogenic (P/LP) variants and carrying VUS, non-variant groups. Differences in metabolites among the groups were calculated using statistical analyses. Changes in conservatism, free energy, and interaction force of MMUT and MMACHC variants were analyzed using silico analysis. Results The percentage of those carrying VUS cases was 68.15% (659/967). In the MMUT gene variant, we found that C3, C3/C2, and C3/C0 levels in those carrying the P/LP variant group were higher than those in the non-variant group (p < 0.000). The conservative scores of those carrying the P/LP variant group were >7. C3, C3/C0, and C3/C2 values of newborns carrying VUS (c.1159A>C and c.1286A>G) were significantly higher than those of the non-variant group and the remaining VUS newborns (p < 0.005). The conservative scores of c.1159A>C and c.1286A>G calculated by ConSurf analysis were 9 and 7, respectively. Unfortunately, three MMA patients with c.1159A>C died during the neonatal period; their C3, C3/C0, C3/C2, and MMA levels were significantly higher than those of the controls. Conclusion Common variants of methylmalonic acidemia in the study population were categorized as VUS. In the neonatal period, the metabolic biomarkers of those carrying the P/LP variant group of the MUT gene were significantly higher than those in the non-variant group. If the metabolic biomarkers of those carrying VUS are also significantly increased, combined with silico analysis the VUS may be elevated to a likely pathogenic variant. The results also suggest that mass spectrometry and silico analysis may be feasible screening methods for verifying the pathogenicity of VUS in other inherited metabolic diseases.
Collapse
Affiliation(s)
- Dongfan Xiao
- Department of Pediatrics, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Inborn Errors of Metabolism Laboratory, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Biomedical Innovation Center, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Congcong Shi
- Department of Pediatrics, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Inborn Errors of Metabolism Laboratory, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Biomedical Innovation Center, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yinchun Zhang
- Department of Pediatrics, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Biomedical Innovation Center, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Sitao Li
- Department of Pediatrics, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Inborn Errors of Metabolism Laboratory, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Biomedical Innovation Center, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yuhao Ye
- Department of Bioengineering, College of Food Science, South China Agricultural University, Guangzhou, China
| | - Guilong Yuan
- Neonates Department, Nanhai Maternity and Child Healthcare Hospital of Foshan, Foshan, China
| | - Taohan Miu
- Neonatology Departmen, Heyuan Women and Children’s Hospital and Health Institute, Heyuan, China
| | - Haiyan Ma
- Department of Neonatology, Zhuhai Women and Children’s Hospital, Zhuhai, China
| | - Shiguang Diao
- Department of Neonatology, Yuebei People’s Hospital, Shaoguan, China
| | - Chaoyun Su
- Department of Neonatology, Maoming Huazhou People’s Hospital, Huazhou, China
| | - Zhitao Li
- Guangzhou Baiyun District Maternal and Child Health Hospital, Guangzhou, China
| | - Haiyan Li
- Department of Pediatrics, Huidong County Maternal and Child Health Hospital, Huidong, China
| | - Guiying Zhuang
- Department of Neonatology, The Maternal and Child Healthcare Hospital of Huadu, Guangzhou, China
| | - Yuanli Wang
- Precision Medicine Laboratory, The First People’s Hospital of Qinzhou, Qinzhou, China
| | - Feiyan Lu
- Huizhou Huiyang District Maternal and Child Health Hospital, Huizhou, China
| | - Xia Gu
- Department of Pediatrics, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Inborn Errors of Metabolism Laboratory, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Biomedical Innovation Center, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Wei Zhou
- Department of Neonatology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Xin Xiao
- Department of Pediatrics, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Inborn Errors of Metabolism Laboratory, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Biomedical Innovation Center, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Weiben Huang
- Department of Neonatology, The Fifth Affiliated Hospital of Southern Medical University, Guangzhou, China
| | - Tao Wei
- Department of Bioengineering, College of Food Science, South China Agricultural University, Guangzhou, China
| | - Hu Hao
- Department of Pediatrics, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Inborn Errors of Metabolism Laboratory, The Sixth Affiliated Hospital, Sun Yat Sen University, Guangzhou, China
- Biomedical Innovation Center, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| |
Collapse
|
3
|
Lopez-Schenk R, Collins NL, Schenk NA, Beard DA. Integrated Functions of Cardiac Energetics, Mechanics, and Purine Nucleotide Metabolism. Compr Physiol 2023; 14:5345-5369. [PMID: 38158366 PMCID: PMC10956446 DOI: 10.1002/cphy.c230011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Purine nucleotides play central roles in energy metabolism in the heart. Most fundamentally, the free energy of hydrolysis of the adenine nucleotide adenosine triphosphate (ATP) provides the thermodynamic driving force for numerous cellular processes including the actin-myosin crossbridge cycle. Perturbations to ATP supply and/or demand in the myocardium lead to changes in the homeostatic balance between purine nucleotide synthesis, degradation, and salvage, potentially affecting myocardial energetics and, consequently, myocardial mechanics. Indeed, both acute myocardial ischemia and decompensatory remodeling of the myocardium in heart failure are associated with depletion of myocardial adenine nucleotides and with impaired myocardial mechanical function. Yet there remain gaps in the understanding of mechanistic links between adenine nucleotide degradation and contractile dysfunction in heart disease. The scope of this article is to: (i) review current knowledge of the pathways of purine nucleotide depletion and salvage in acute ischemia and in chronic heart disease; (ii) review hypothesized mechanisms linking myocardial mechanics and energetics with myocardial adenine nucleotide regulation; and (iii) highlight potential targets for treating myocardial metabolic and mechanical dysfunction associated with these pathways. It is hypothesized that an imbalance in the degradation, salvage, and synthesis of adenine nucleotides leads to a net loss of adenine nucleotides in both acute ischemia and under chronic high-demand conditions associated with the development of heart failure. This reduction in adenine nucleotide levels results in reduced myocardial ATP and increased myocardial inorganic phosphate. Both of these changes have the potential to directly impact tension development and mechanical work at the cellular level. © 2024 American Physiological Society. Compr Physiol 14:5345-5369, 2024.
Collapse
Affiliation(s)
- Rachel Lopez-Schenk
- Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan, USA
| | - Nicole L Collins
- Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan, USA
| | - Noah A Schenk
- Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan, USA
| | - Daniel A Beard
- Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan, USA
| |
Collapse
|
4
|
Adenine overload induces ferroptosis in human primary proximal tubular epithelial cells. Cell Death Dis 2022; 13:104. [PMID: 35110539 PMCID: PMC8810935 DOI: 10.1038/s41419-022-04527-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 12/21/2021] [Accepted: 01/12/2022] [Indexed: 12/17/2022]
Abstract
The pathogenesis of crystal nephropathy involves deposition of intratubular crystals, tubular obstruction and cell death. The deposition of 8-dihydroxyadenine (DHA) crystals within kidney tubules, for instance, is caused by a hereditary deficiency of adenine phosphoribosyl transferase in humans or adenine overload in preclinical models. However, the downstream pathobiological patterns of tubular cell attrition in adenine/DHA-induced nephropathy remain poorly understood. In this study, we investigated: (i) the modes of adenine-induced tubular cell death in an experimental rat model and in human primary proximal tubular epithelial cells (PTEC); and (ii) the therapeutic effect of the flavonoid baicalein as a novel cell death inhibitor. In a rat model of adenine diet-induced crystal nephropathy, significantly elevated levels of tubular iron deposition and lipid peroxidation (4-hydroxynonenal; 4-HNE) were detected. This phenotype is indicative of ferroptosis, a novel form of regulated necrosis. In cultures of human primary PTEC, adenine overload-induced significantly increased mitochondrial superoxide levels, mitochondrial depolarisation, DNA damage and necrotic cell death compared with untreated PTEC. Molecular interrogation of adenine-stimulated PTEC revealed a significant reduction in the lipid repair enzyme glutathione peroxidase 4 (GPX4) and the significant increase in 4-HNE compared with untreated PTEC, supporting the concept of ferroptotic cell death. Moreover, baicalein treatment inhibited ferroptosis in adenine-stimulated PTEC by selectively modulating the mitochondrial antioxidant enzyme superoxide dismutase 2 (SOD2) and thus, suppressing mitochondrial superoxide production and DNA damage. These data identify ferroptosis as the primary pattern of PTEC necrosis in adenine-induced nephropathy and establish baicalein as a potential therapeutic tool for the clinical management of ferroptosis-associated crystal nephropathies (e.g., DHA nephropathy, oxalate nephropathy).
Collapse
|
5
|
Sharma M, Gowrishankar S, Jeloka TK. A Rare Case of APRT Deficiency with End-stage Renal Failure and Successful Renal Transplant. Indian J Nephrol 2021; 31:57-60. [PMID: 33994690 PMCID: PMC8101663 DOI: 10.4103/ijn.ijn_202_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Revised: 09/05/2019] [Accepted: 10/30/2019] [Indexed: 11/30/2022] Open
Abstract
Renal calculus disease is a common cause of renal injury. However, crystal nephropathy (uric acid, oxalate, and dihydroxyadenine) can present as chronic kidney disease without any evidence of renal stones. If left undiagnosed, there is a potential chance of recurrence in the allograft leading to graft failure after transplantation. Pretransplant identification and management can avoid such complications. Here, we describe a case of APRT deficiency leading to crystal nephropathy and end-stage renal failure in a patient who underwent a successful kidney transplant.
Collapse
Affiliation(s)
- Manish Sharma
- Department of Nephrology, Aditya Birla Memorial Hospital, Pune, Maharashtra, India
| | | | - Tarun K Jeloka
- Department of Nephrology, Aditya Birla Memorial Hospital, Pune, Maharashtra, India
| |
Collapse
|
6
|
Huq A, Nand K, Juneja R, Winship I. APRT deficiency: the need for early diagnosis. BMJ Case Rep 2018; 2018:bcr-2018-225742. [DOI: 10.1136/bcr-2018-225742] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Adenine phosphoribosyltransferase (APRT) deficiency is a rare autosomal recessive disorder which leads to accumulation of poorly soluble 2,8-dihydroxyadenine in kidneys resulting in nephrolithiasis as well as chronic kidney disease from crystal nephropathy. This report describes a 55-year-old previously fit man who presented with shortness of breath and the investigative pathway that eventually led to a diagnosis of APRT deficiency. Early diagnosis has aided in timely institution of allopurinol, thereby improving his renal function and possibility of weaning off renal replacement therapy. Genetic testing has enabled early identification of other family members at risk and prevention of renal failure by commencing xanthine oxidoreductase (XOR) inhibitors. The issues surrounding kidney donation by a member of this family are also discussed. This case represents the importance of awareness and recognition of the signs and symptoms of this rare condition, complications of which can be easily prevented by early institution of XOR inhibitor therapy.
Collapse
|
7
|
Simmonds HA, Potter CF, Sahota A, Cameron JS, Rose GA, Barratt TM, Williams DI, Arkell DG, Van Acker KJ. Adenine Phosphoribosyltransferase Deficiency Presenting with Supposed ‘Uric Acid’ Stones: Pitfalls of Diagnosis1. J R Soc Med 2018; 71:791-5. [PMID: 731641 PMCID: PMC1436179 DOI: 10.1177/014107687807101104] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
|
8
|
Balasubramaniam GS, Arenas-Hernandez M, Escuredo E, Fairbanks L, Marinaki T, Mapplebeck S, Sheaff M, Almond MK. Adenine phosphoribosyltransferase deficiency in the United Kingdom: two novel mutations and a cross-sectional survey. Clin Kidney J 2016; 9:800-806. [PMID: 27994857 PMCID: PMC5162415 DOI: 10.1093/ckj/sfw093] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 08/04/2016] [Indexed: 11/18/2022] Open
Abstract
Background Adenine phosphoribosyltransferase deficiency is an inborn error of metabolism that can cause kidney disease from crystalline nephropathy or kidney stones. Methods We present three cases from a single centre with varied presentations to illustrate how increasing awareness led to better patient identification. We then undertook a cross-sectional survey of all the patients identified from the Purine Research Laboratory in the UK since 1974. Results Our index case presented with recurrent nephrolithiasis and was diagnosed on stone analysis, the second case presented with acute kidney injury and the third case was identified from a biopsy undertaken for acute on chronic kidney injury. Genetic studies identified two novel mutations. Twenty patients were retrospectively identified. The mean age at diagnosis was 25 years (range 2–70); eight were <20 years, seven were 20–40 years and five were >40 years. Five of the 20 patients were deceased, 3 after end-stage renal disease (ESRD). Twelve have normal renal function, one had CKD stage 3, one had severe kidney disease and one was on dialysis. Conclusions Adenine phosphoribosyltransferase deficiency presents in a wide spectrum in all age groups. Patients can be completely asymptomatic and kidney disease may be incorrectly attributed to other conditions. Outcome is poor in late diagnosis and there is a high prevalence of ESRD. Patients with unexplained renal stone disease or deterioration in kidney function should be considered for screening. Identification and surveillance of patients in the UK can improve. There is now a rare disease registry with meetings organized that include patients, families and health care providers to improve awareness.
Collapse
Affiliation(s)
- Gowrie S Balasubramaniam
- Department of Renal Medicine, Southend University Hospital, Prittlewell Chase, Westcliff-on-Sea, Southend SO0 0RY, UK
| | | | - Emilia Escuredo
- Purine Research Laboratory, St Thomas' Hospital, Westminister Bridge Road, London, UK
| | - Lynette Fairbanks
- Purine Research Laboratory, St Thomas' Hospital, Westminister Bridge Road, London, UK
| | - Tony Marinaki
- Purine Research Laboratory, St Thomas' Hospital, Westminister Bridge Road, London, UK
| | - Sarah Mapplebeck
- Department of Biochemistry, Southend University Hospital, Prittlewell Chase, Westcliff-on-Sea, Southend, UK
| | - Michael Sheaff
- Department of Pathology, Barts and the London Hospital, Royal London Hospital, Whitechapel Road, Whitechapel, London, UK
| | - Michael K Almond
- Department of Renal Medicine, Southend University Hospital, Prittlewell Chase, Westcliff-on-Sea, Southend SO0 0RY, UK
| |
Collapse
|
9
|
An infant with nephrolithiasis and renal failure: Answers. Pediatr Nephrol 2016; 31:1083-4. [PMID: 25862022 DOI: 10.1007/s00467-015-3100-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 03/11/2015] [Accepted: 03/18/2015] [Indexed: 10/23/2022]
|
10
|
Bollée G, Cochat P, Daudon M. Recurrence of crystalline nephropathy after kidney transplantation in APRT deficiency and primary hyperoxaluria. Can J Kidney Health Dis 2015; 2:31. [PMID: 26380104 PMCID: PMC4570695 DOI: 10.1186/s40697-015-0069-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Accepted: 07/24/2015] [Indexed: 01/25/2023] Open
Abstract
Purpose of review To provide transplant physicians with a summary of the pathogenesis and diagnosis of adenine phosphoribosyl transferase (APRT) deficiency and primary hyperoxaluria and, focussed on kidney transplantation, and to discuss interventions aimed at preventing and treating the recurrence of crystalline nephropathy in renal transplant recipients. Source of information Pubmed literature search. Setting Primary hyperoxaluria and APRT deficiency are rare inborn errors of human metabolism. The hallmark of these diseases is the overproduction and urinary excretion of compounds (2,8 dihydroxyadenine in APRT deficiency, oxalate in primary hyperoxaluria) that form urinary crystals. Although recurrent urolithiasis represents the main clinical feature of these diseases, kidney injury can occur as a result of crystal precipitation within the tubules and interstitium, a condition referred to as crystalline nephropathy. Some patients develop end-stage renal disease (ESRD) and may become candidates for kidney transplantation. Since kidney transplantation does not correct the underlying metabolic defect, transplant recipients have a high risk of recurrence of crystalline nephropathy, which can lead to graft loss. In some instances, the disease remains undiagnosed until after the occurrence of ESRD or even after kidney transplantation. Key messages Patients with APRT deficiency or primary hyperoxaluria may develop ESRD as a result of crystalline nephropathy. In the absence of diagnosis and adequate management, the disease is likely to recur after kidney transplantation, which often leads to rapid loss of renal allograft function. Primary hyperoxaluria, but not APRT deficiency, becomes a systemic disease at low GFR with oxalate deposition leading to malfunction in non-renal organs (systemic oxalosis). We suggest that these diagnoses should be considered in patients with low glomerular filtration rate (GFR) and a history of kidney stones. In APRT deficiency, stones may be confused with uric acid stones, unless specialized techniques are used (infrared spectroscopy or X-ray crystallography for urinary crystals or stone analysis; Fourier transform infrared microscopy for crystals in kidney biopsy). Where these are unavailable, and for confirmation, the diagnosis can be made by measurement of enzyme activity in red blood cell lysates or by genetic testing. In patients with primary hyperoxaluria, levels of urinary and plasma oxalate; and the presence of nearly pure calcium oxalate monohydrate in stones, which often also have an unusually pale colour and unorganized structure, increase diagnostic suspicion. Molecular genetic testing is the criterion measure. Lifelong allopurinol therapy, with high fluid intake if appropriate, may stabilize kidney function in APRT deficiency; if ESRD has occurred or is near, results with kidney transplantation after initiation of allopurinol are excellent. In primary hyperoxaluria recognized before ESRD, pyridoxine treatment and high fluid intake may lead to a substantial decrease in urinary calcium oxalate supersaturation and prevent renal failure. In non-responsive patients or those recognized later in their disease, liver transplantation cures the underlying defect and should be considered when the GFR falls below 30 ml/min/1.73 m2; in those which or near ESRD, liver transplantation and intensive dialysis before kidney transplantation may be considered to reduce the total body oxalate burden before kidney transplantation. Limitations The availability of diagnostic tests varies between countries and centres. Data on long term outcomes after kidney transplantation are limited, especially for APRT deficiency patients. Implications Increasing transplant physicians knowledge of APRT deficiency and primary hyperoxaluria should enable them to implement adequate diagnostic and therapeutic interventions, thereby achieving good outcomes after kidney transplantation.
Collapse
Affiliation(s)
- Guillaume Bollée
- Division of Nephrology and Research Centre of the Centre Hospitalier de l'Université de Montréal and Université de Montréal, Montréal, Québec Canada ; Division of Nephrology, Hôpital Notre Dame, 1560 Sherbrooke Street East, Montreal, QC H2L 4 M1 Canada
| | - Pierre Cochat
- Centre de Référence des Maladies Rénales Rares, Hospices Civils de Lyon and Université Claude-Bernard Lyon 1, Lyon, France
| | - Michel Daudon
- Service d'Explorations Fonctionnelles, AP-HP, Hôpital Tenon, Paris, France
| |
Collapse
|
11
|
Ceballos-Picot I, Daudon M, Harambat J, Bensman A, Knebelmann B, Bollée G. 2,8-Dihydroxyadenine urolithiasis: a not so rare inborn error of purine metabolism. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2015; 33:241-52. [PMID: 24940675 DOI: 10.1080/15257770.2013.853780] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Adenine phosphoribosyltransferase (APRT) deficiency is a rare inherited metabolic disorder that leads to the formation and hyperexcretion of 2,8-dihydroxyadenine (DHA) into urine. The low solubility of DHA results in precipitation and formation of urinary crystals and kidney stones. The disease can be present as recurrent urolithiasis or nephropathy secondary to crystal precipitation into renal parenchyma (DHA nephropathy). The diagnostic tools available, including stone analysis, crystalluria, and APRT activity in red blood cells, make the diagnosis easy to confirm when APRT deficiency is suspected. However, the lack of recognition of this metabolic disorder frequently resulted in a delay in diagnosis and treatment with grave consequences. The early recognition and treatment of APRT deficiency are of crucial importance to prevent irreversible loss of renal function. This review summarizes the genetic and metabolic mechanisms underlying DHA stones formation and chronic kidney disease, along with the issues of diagnosis and management of APRT deficiency. Moreover, we report the mutations in the APRT gene responsible for APRT deficiency in 51 French patients (43 families) including 22 pediatric cases (18 families) among the 64 patients identified in the biochemistry laboratories of Necker Hospital, Paris (1978-2013).
Collapse
Affiliation(s)
- Irène Ceballos-Picot
- a Université Paris Descartes, Assistance Publique Hôpitaux de Paris, Laboratoire de Biochimie Métabolomique et protéomique, Hôpital Necker-Enfants Malades , Paris , France
| | | | | | | | | | | |
Collapse
|
12
|
Bollée G, Daudon M, Ceballos-Picot I. Adenine phosphoribosyltransferase deficiency: Leave no stone unturned. World J Clin Urol 2014; 3:218-226. [DOI: 10.5410/wjcu.v3.i3.218] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 06/04/2014] [Accepted: 07/29/2014] [Indexed: 02/06/2023] Open
Abstract
Adenine phosphoribosyltransferase (APRT) deficiency is a rare autosomal recessive disease leading to generation of large amounts of 2,8-dihydroxyadenine (DHA). DHA is excreted in urine, where it precipitates into crystals due to its low solubility. DHA crystals can aggregate into stones or cause injury to the renal parenchyma (DHA nephropathy). Recurrent urolithiasis and DHA nephropathy are the two clinical manifestations of APRT deficiency. Diagnosis of APRT deficiency can be made during childhood as well as adulthood. Diagnosis mainly relies on the recognition of DHA in stones or urine crystals. Measurement of APRT activity and genetic testing are useful for confirmation of diagnosis, for family screening and should be considered in difficult cases of urolithiasis or crystalline nephropathy. Allopurinol therapy is the cornerstone of treatment and is highly effective in preventing recurrence of stones and kidney disease. High fluid intake and dietary modifications are also recommended. Early diagnosis and treatment are of paramount importance to prevent renal damage. Unfortunately, diagnosis of APRT deficiency is often overlooked and irreversible renal failure still occurs in a substantial proportion of patients. Clinicians must be alert to the possibility of APRT deficiency and consider the appropriate diagnostic tests in certain cases. This review discusses the genetic and biochemical mechanisms of APRT deficiency, and the issues of diagnosis and management.
Collapse
|
13
|
Bollée G, Harambat J, Bensman A, Knebelmann B, Daudon M, Ceballos-Picot I. Adenine phosphoribosyltransferase deficiency. Clin J Am Soc Nephrol 2012; 7:1521-7. [PMID: 22700886 DOI: 10.2215/cjn.02320312] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Complete adenine phosphoribosyltransferase (APRT) deficiency is a rare inherited metabolic disorder that leads to the formation and hyperexcretion of 2,8-dihydroxyadenine (DHA) into urine. The low solubility of DHA results in precipitation of this compound and the formation of urinary crystals and stones. The disease can present as recurrent urolithiasis or nephropathy secondary to crystal precipitation into renal parenchyma (DHA nephropathy). The diagnostic tools available-including stone analysis, crystalluria, and APRT activity measurement-make the diagnosis easy to confirm when APRT deficiency is suspected. However, the disease can present at any age, and the variability of symptoms can present a diagnostic challenge to many physicians. The early recognition and treatment of APRT deficiency are of crucial importance for preventing irreversible loss of renal function, which still occurs in a non-negligible proportion of cases. This review summarizes the genetic and metabolic mechanisms underlying stone formation and renal disease, along with the diagnosis and management of APRT deficiency.
Collapse
Affiliation(s)
- Guillaume Bollée
- Association pour l'Utilisation du Rein Artificiel and Inserm U970, Paris, France.
| | | | | | | | | | | |
Collapse
|
14
|
Harambat J, Bollée G, Daudon M, Ceballos-Picot I, Bensman A. Adenine phosphoribosyltransferase deficiency in children. Pediatr Nephrol 2012; 27:571-9. [PMID: 22212387 DOI: 10.1007/s00467-011-2037-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Revised: 09/21/2011] [Accepted: 09/22/2011] [Indexed: 01/05/2023]
Abstract
Adenine phosphoribosyltransferase (APRT) deficiency is a rare autosomal recessive disorder characterized by 2,8-dihydroxyadenine (2,8-DHA) crystalluria that can cause nephrolithiasis and chronic kidney disease. The aim of our study was to assess the clinical presentation, diagnosis, and outcome of APRT deficiency in a large pediatric cohort. All pediatric cases of APRT deficiency confirmed at the same French reference laboratories between 1978 and 2010 were retrospectively reviewed. Twenty-one patients from 18 families were identified. The median age at diagnosis was 3 years. Diagnosis was made after one or more episodes of nephrolithiasis (17 patients), after urinary tract infection (1 patient), and by family screening (3 patients). The diagnosis was based on stone analysis and microscopic examination of urine and/or enzymatic determination of APRT on red blood cells. All children had null APRT enzyme activity in erythrocytes. APRT gene sequencing was performed on 18 patients, revealing six homozygous and 12 compound heterozygous mutations. At diagnosis, half of the patients had decreased kidney function, and two children presented with acute renal failure. Allopurinol treatment was given to all patients at a median dose of 9 mg/kg/day. After a median follow-up of 5 years, all patients showed stabilization or improvement of kidney function, normal growth and development, and six patients had recurrence of nephrolithiasis. Based on these results, we conclude that an excellent outcome can be achieved in children with APRT deficiency who receive the proper treatment.
Collapse
Affiliation(s)
- Jérôme Harambat
- Service de Pédiatrie, Centre Hospitalier Universitaire de Bordeaux, Centre de référence Maladies Rénales Rares du Sud Ouest, Bordeaux, France.
| | | | | | | | | | | |
Collapse
|
15
|
Laxdal T, Jónasson TA. Adenine phosphoribosyltransferase deficiency in Iceland. ACTA MEDICA SCANDINAVICA 2009; 224:621-6. [PMID: 3207073 DOI: 10.1111/j.0954-6820.1988.tb19635.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Two children and two adults of four unrelated families were on regular light microscopic examination found to exhibit identical, spherical urine crystals. Their characteristic appearance led to the diagnosis of 2,8-dihydroxyadenine crystalluria by spectrophotometric or gas-chromatographic/mass-spectrometric analysis. Total deficiency of adenine phosphoribosyltransferase was confirmed by direct measurements of the enzyme activity in lysed red blood cells. Close family members were also examined for the enzyme defect, revealing no additional homozygotes, but 13 heterozygotes among 14 relatives. We suggest that round, brownish urine crystals, even without radiolucent kidney stones, should alert the physician to search for the existence of 2,8-dihydroxyadenine. Proper treatment could then be instituted without delay, preventing eventual kidney damage.
Collapse
Affiliation(s)
- T Laxdal
- Department of Paediatrics, St. Joseph's Hospital, Reykjavík, Iceland
| | | |
Collapse
|
16
|
Becker MA, Raivio KO, Seegmiller JE. Synthesis of phosphoribosylpyrophosphate in mammalian cells. ADVANCES IN ENZYMOLOGY AND RELATED AREAS OF MOLECULAR BIOLOGY 2006; 49:281-306. [PMID: 95664 DOI: 10.1002/9780470122945.ch7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
17
|
Grünfeld JP. Congenital/inherited kidney diseases: how to identify them early and how to manage them. Clin Exp Nephrol 2005; 9:192-4. [PMID: 16189626 DOI: 10.1007/s10157-005-0352-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2004] [Accepted: 03/10/2005] [Indexed: 11/25/2022]
Affiliation(s)
- Jean-Pierre Grünfeld
- Hôpital Necker, Université Paris V, René Descartes, 149, rue de Sèvres, 75743 Paris Cedex 15, France.
| |
Collapse
|
18
|
Abstract
Humans although a predominantly ureotylic organism, has preserved the ability to excrete nitrogen as uric acid and ammonia. An imbalance between these two secondary modes of nitrogen excretion has resulted in uric acid precipitation in human urine. Uric acid nephrolithiasis can arise from diverse etiologies all with distinct underlying defects converging to one or more of three defects of hyperuricosuria, acidic urine pH, and low urinary volume, originating from secondary, genetic or heretofore undefined (idiopathic) causes. A subset of idiopathic uric acid nephrolithiasis (gouty diathesis) may be the "tip of the icebergp" of a broader systemic illness characterized by insulin resistance. A novel renal manifestation of insulin resistance is a mild defect in ammonium excretion, which is not severe enough to disturb acid-base homeostasis, but is sufficient to set up the chemical milieu for uric acid nephrolithiasis.
Collapse
Affiliation(s)
- Orson W Moe
- Department of Internal Medicine, Center for Mineral Metabolism and Clinical Research, Center of Human Nutrition, University of Texas Southwestern Medical Center, Department of Veteran Affairs Medical Center, Dallas, TX, USA.
| | | | | |
Collapse
|
19
|
Van den Berghe G. Purine and pyrimidine metabolism between millennia: what has been accomplished, what has to be done? ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2002; 486:1-4. [PMID: 11783461 DOI: 10.1007/0-306-46843-3_1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- G Van den Berghe
- Laboratory of Physiological Chemisty, Christian de Duve Institute of Cellular Pathology, and Université Catholique de Louvain, Brussels, Belgium
| |
Collapse
|
20
|
Antonio Orts Costa J, Zúñiga Cabrera Á, Ferrando Monleón S. Litiasis purínicas infrecuentes: déficit de adenina fosforribosiltransferasa y xantinuria hereditaria. Med Clin (Barc) 2002. [DOI: 10.1016/s0025-7753(02)73476-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
21
|
Deng L, Yang M, Fründ S, Wessel T, De Abreu RA, Tischfield JA, Sahota A. 2,8-Dihydroxyadenine urolithiasis in a patient with considerable residual adenine phosphoribosyltransferase activity in cell extracts but with mutations in both copies of APRT. Mol Genet Metab 2001; 72:260-4. [PMID: 11243733 DOI: 10.1006/mgme.2000.3142] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We have examined the mutational basis of adenine phosphoribosyltransferase (APRT, EC 2.4.2.7) deficiency (MIM 102600) in a patient of Polish origin who has been passing 2,8-dihydroxyadenine (DHA) stones since birth, but has considerable residual enzyme activity in lymphocyte extracts. The five exons and flanking regions of APRT were amplified by PCR and then sequenced. A single T insertion was identified at the intron 4 splice donor site (TGgtaa to TGgttaa:IVS4+2insT) in one allele from the proband, his mother, and brother. A G-to-T transversion in exon 5 (GTC-to-TTC:c.448G>T, V150F) was identified in the other allele, and this mutation was also present in one allele from the father and the paternal grandmother. Tru91 and AvaII digestions of PCR products spanning exons 4 and 5, respectively, confirmed the mutations. The mother was heterozygous for an intragenic TaqI site, but all other family members were homozygous for the presence of this site. IVS4+2insT, located on the allele containing the TaqI site, has been identified previously in several families from Europe, suggesting a founder effect, but the substitution in exon 5 is a novel mutation. IVS4+2insT is known to result in complete loss of enzyme activity, and our results suggest that V150F produces an enzyme that is nonfunctional in vivo but has considerable residual activity in vitro.
Collapse
Affiliation(s)
- L Deng
- Department of Genetics, Rutgers University, Piscataway, New Jersey 08854-8082, USA
| | | | | | | | | | | | | |
Collapse
|
22
|
Abstract
A recent analysis of the McKusick's On-Line Mendelian Inheritance in Man (OMIM) database revealed over 30 genetic or putatively genetic conditions in which urolithiasis contributes to the disease pathology at least to some extent. There is wide clinical, biochemical, and genetic heterogeneity in many of these conditions.
Collapse
Affiliation(s)
- C J Danpure
- MRC Laboratory for Molecular Cell Biology, University College London, United Kingdom.
| |
Collapse
|
23
|
Abstract
Red blood cell enzyme activities are measured mainly to diagnose hereditary nonspherocytic hemolytic anemia associated with enzyme anomalies. At least 15 enzyme anomalies associated with hereditary hemolytic anemia have been reported. Some nonhematologic disease can also be diagnosed by the measurement of red blood cell enzyme activities in the case in which enzymes of red blood cells and the other organs are under the same genetic control. Progress in molecular biology has provided a new perspective. Techniques such as the polymerase chain reaction and single-strand conformation polymorphism analysis have greatly facilitated the molecular analysis of erythroenzymopathies. These studies have clarified the correlation between the functional and structural abnormalities of the variant enzymes. In general, the mutations that induce an alteration of substrate binding site and/or enzyme instability might result in markedly altered enzyme properties and severe clinical symptoms.
Collapse
Affiliation(s)
- H Fujii
- Department of Blood Transfusion Medicine, Tokyo Women's Medical College, Japan
| | | |
Collapse
|
24
|
Abstract
Experimental and clinical data on purine metabolism are collated and analyzed with three mathematical models. The first model is the result of an attempt to construct a traditional kinetic model based on Michaelis-Menten rate laws. This attempt is only partially successful, since kinetic information, while extensive, is not complete, and since qualitative information is difficult to incorporate into this type of model. The data gaps necessitate the complementation of the Michaelis-Menten model with other functional forms that can incorporate different types of data. The most convenient and established representations for this purpose are rate laws formulated as power-law functions, and these are used to construct a Complemented Michaelis-Menten (CMM) model. The other two models are pure power-law-representations, one in the form of a Generalized Mass Action (GMA) system, and the other one in the form of an S-system. The first part of the paper contains a compendium of experimental data necessary for any model of purine metabolism. This is followed by the formulation of the three models and a comparative analysis. For physiological and moderately pathological perturbations in metabolites or enzymes, the results of the three models are very similar and consistent with clinical findings. This is an encouraging result since the three models have different structures and data requirements and are based on different mathematical assumptions. Significant enzyme deficiencies are not so well modeled by the S-system model. The CMM model captures the dynamics better, but judging by comparisons with clinical observations, the best model in this case is the GMA model. The model results are discussed in some detail, along with advantages and disadvantages of each modeling strategy.
Collapse
Affiliation(s)
- R Curto
- Departament de Bioquímica i Biología Molecular, Facultat de Químiques, Universitat de Barcelona, Catalunya, Spain
| | | | | | | |
Collapse
|
25
|
Curto R, Voit EO, Cascante M. Analysis of abnormalities in purine metabolism leading to gout and to neurological dysfunctions in man. Biochem J 1998; 329 ( Pt 3):477-87. [PMID: 9445373 PMCID: PMC1219067 DOI: 10.1042/bj3290477] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A modelling approach is used to analyse diseases associated with purine metabolism in man. The specific focus is on deficiencies in two enzymes, hypoxanthine:guanine phosphoribosyltransferase and adenylosuccinate lyase. These deficiencies can lead to a number of symptoms, including neurological dysfunctions and mental retardation. Although the biochemical mechanisms of dysfunctions associated with adenylosuccinate lyase deficiency are not completely understood, there is at least general agreement in the literature about possible causes. Simulations with our model confirm that accumulation of the two substrates of the enzyme can lead to significant biochemical imbalance. In hypoxanthine:guanine phosphoribosyltransferase deficiency the biochemical mechanisms associated with neurological dysfunctions are less clear. Model analyses support some old hypotheses but also suggest new indicators for possible causes of neurological dysfunctions associated with this deficiency. Hypoxanthine:guanine phosphoribosyltransferase deficiency is known to cause hyperuricaemia and gout. We compare the relative importance of this deficiency with other known causes of gout in humans. The analysis suggests that defects in the excretion of uric acid are more consequential than defects in uric acid synthesis such as hypoxanthine:guanine phosphoribosyltransferase deficiency.
Collapse
Affiliation(s)
- R Curto
- Departament de Bioquimica i Biologia Molecular, Facultat de Quimiques, Universitat de Barcelona, Spain
| | | | | |
Collapse
|
26
|
Curto R, Voit EO, Sorribas A, Cascante M. Validation and steady-state analysis of a power-law model of purine metabolism in man. Biochem J 1997; 324 ( Pt 3):761-75. [PMID: 9210399 PMCID: PMC1218491 DOI: 10.1042/bj3240761] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The paper introduces a model of human purine metabolism in situ. Chosen from among several alternative system descriptions, the model is formulated as a Generalized Mass Action system within Biochemical Systems Theory and validated with analyses of steady-state and dynamic characteristics. Eigenvalue and sensitivity analyses indicate that the model has a stable and robust steady-state. The model quite accurately reproduces numerous biochemical and clinical observations in healthy subjects as well as in patients with disorders of purine metabolism. These results suggest that the model can be used to assess biochemical and clinical aspects of human purine metabolism. It provides a means of exploring effects of enzyme deficiencies and is a potential tool for identifying steps of the pathway that could be the target of therapeutical intervention. Numerous quantitative comparisons with data are given. The model can be used for biomathematical exploration of relationships between enzymic deficiencies and clinically manifested diseases.
Collapse
Affiliation(s)
- R Curto
- Departament de Bioquímica i Biología Molecular, Facultat de Químiques, Universitat de Barcelona, 08028 Barcelona, Catalunya, Spain
| | | | | | | |
Collapse
|
27
|
De Jong DJ, Assmann KJ, De Abreu RA, Monnens LA, Van Liebergen FJ, Dijkman HB, Huysmans FT. 2,8-Dihydroxyadenine Stone Formation in a Renal Transplant Recipient due to Adenine Phosphoribosyltransferase Deficiency. J Urol 1996. [DOI: 10.1016/s0022-5347(01)65501-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Dirk J. De Jong
- Department of Internal Medicine, Bosch Medicentrum, s'-Hertogenbosch and Departments of Pathology, Pediatrics and Nephrology, University Hospital Nijmegen, Nijmegen, The Netherlands
| | - Karel J.M. Assmann
- Department of Internal Medicine, Bosch Medicentrum, s'-Hertogenbosch and Departments of Pathology, Pediatrics and Nephrology, University Hospital Nijmegen, Nijmegen, The Netherlands
| | - Ronney A. De Abreu
- Department of Internal Medicine, Bosch Medicentrum, s'-Hertogenbosch and Departments of Pathology, Pediatrics and Nephrology, University Hospital Nijmegen, Nijmegen, The Netherlands
| | - Leo A.H. Monnens
- Department of Internal Medicine, Bosch Medicentrum, s'-Hertogenbosch and Departments of Pathology, Pediatrics and Nephrology, University Hospital Nijmegen, Nijmegen, The Netherlands
| | - Frans J.H.M. Van Liebergen
- Department of Internal Medicine, Bosch Medicentrum, s'-Hertogenbosch and Departments of Pathology, Pediatrics and Nephrology, University Hospital Nijmegen, Nijmegen, The Netherlands
| | - Henri B.P.M. Dijkman
- Department of Internal Medicine, Bosch Medicentrum, s'-Hertogenbosch and Departments of Pathology, Pediatrics and Nephrology, University Hospital Nijmegen, Nijmegen, The Netherlands
| | - Frans T.M. Huysmans
- Department of Internal Medicine, Bosch Medicentrum, s'-Hertogenbosch and Departments of Pathology, Pediatrics and Nephrology, University Hospital Nijmegen, Nijmegen, The Netherlands
| |
Collapse
|
28
|
Redhead NJ, Selfridge J, Wu CL, Melton DW. Mice with adenine phosphoribosyltransferase deficiency develop fatal 2,8-dihydroxyadenine lithiasis. Hum Gene Ther 1996; 7:1491-502. [PMID: 8864750 DOI: 10.1089/hum.1996.7.13-1491] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Deficiencies in different steps of purine metabolism give rise to a number of human inherited disorders. Lesch-Nyhan syndrome is a severe neurological disorder, caused by a deficiency in the purine salvage enzyme hypoxanthine phosphoribosyltransferase (HPRT). HPRT-deficient mice have been generated, but have proved to be an unsuccessful model of the human disease. We have suggested that this may be due to a greater dependency in rodents on the other purine salvage enzyme, adenine phosphoribosyltransferase (APRT). We have generated an APRT-deficient mouse line by gene targeting, with a phenotype that closely resembled the symptoms of APRT deficiency in man. APRT null mice were viable, but 90% died prematurely before 6 months of age, displaying highly abnormal kidney morphology, with pathology characteristic of tubule obstruction. These mice have elevated urinary levels of adenine and 2,8-dihydroxyadenine, a highly insoluble adenine derivative, plus birefringent crystalline deposits and calculi within tubules throughout the kidney. A standard therapy for APRT-deficient human patients is the administration of the xanthine oxidase inhibitor, allopurinol. This has proved an effective therapy for APRT null mice, preventing accumulation of 2,8-dihydroxyadenine and much of the resultant renal obstruction, allowing us to establish a breeding line. We believe that these mice should provide a useful model for further study of APRT deficiency in humans. Furthermore, by generating APRT and HPRT double mutants, we will be able to test our hypothesis that both genes must be inactivated in mice before a model for Lesch-Nyhan syndrome can be obtained.
Collapse
Affiliation(s)
- N J Redhead
- Institute of Cell and Molecular Biology, University of Edinburgh, Scotland
| | | | | | | |
Collapse
|
29
|
Engle SJ, Stockelman MG, Chen J, Boivin G, Yum MN, Davies PM, Ying MY, Sahota A, Simmonds HA, Stambrook PJ, Tischfield JA. Adenine phosphoribosyltransferase-deficient mice develop 2,8-dihydroxyadenine nephrolithiasis. Proc Natl Acad Sci U S A 1996; 93:5307-12. [PMID: 8643571 PMCID: PMC39241 DOI: 10.1073/pnas.93.11.5307] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Adenine phosphoribosyltransferase (APRT) deficiency in humans is an autosomal recessive syndrome characterized by the urinary excretion of adenine and the highly insoluble compound 2,8-dihydroxyadenine (DHA) that can produce kidney stones or renal failure. Targeted homologous recombination in embryonic stem cells was used to produce mice that lack APRT. Mice homozygous for a null Aprt allele excrete adenine and DHA crystals in the urine. Renal histopathology showed extensive tubular dilation, inflammation, necrosis, and fibrosis that varied in severity between different mouse backgrounds. Thus, biochemical and histological changes in these mice mimic the human disease and provide a suitable model of human hereditary nephrolithiasis.
Collapse
Affiliation(s)
- S J Engle
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, 46202-5251, USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Terai C, Hakoda M, Yamanaka H, Kamatani N, Okai M, Takahashi F, Kashiwazaki S. Adenine phosphoribosyltransferase deficiency identified by urinary sediment analysis: cellular and molecular confirmation. Clin Genet 1995; 48:246-50. [PMID: 8825602 DOI: 10.1111/j.1399-0004.1995.tb04098.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Adenine phosphoribosyltransferase deficiency is an autosomal recessive purine enzyme defect that causes urolithiasis and, in severe cases, renal failure. Most homozygotes with this disorder were identified by analyses of excreted or surgically removed urinary stones, but some were identified only because they were family members of symptomatic individuals. We report here the detection of adenine phosphoribosyltransferase deficiency in two cases by routine analysis of urinary sediments. 2,8-Dihydroxyadenine-like spherical crystals were observed in the urinary sediment, and a diagnosis of homozygous adenine phosphoribosyltransferase deficiency was confirmed by cellular and molecular methods. A molecular diagnostic system using the polymerase-chain reaction and single-strand conformational polymorphism analysis proved to be a rapid and sensitive method to identify the APRT*J allele, a common mutant allele among the Japanese people. These methods will facilitate identification of symptomatic and asymptomatic individuals with homozygous adenine phosphoribosyltransferase deficiency.
Collapse
Affiliation(s)
- C Terai
- Institute of Rheumatology, Tokyo Women's Medical College, Japan
| | | | | | | | | | | | | |
Collapse
|
31
|
Gagné ER, Deland E, Daudon M, Noël LH, Nawar T. Chronic renal failure secondary to 2,8-dihydroxyadenine deposition: the first report of recurrence in a kidney transplant. Am J Kidney Dis 1994; 24:104-7. [PMID: 8023815 DOI: 10.1016/s0272-6386(12)80168-5] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We report a case of adenine phosphoribosyltransferase deficiency in which the initial presentation was chronic renal failure. Diagnosis was made after infrared microscopy analysis of microcrystalline deposits on a kidney allograft biopsy specimen. This type of presentation is rarely seen, the most frequent manifestation of this disease being urolithiasis. This is the first report of recurrence of the microcrystalline nephritis in a kidney transplant with subsequent loss of allograft function.
Collapse
Affiliation(s)
- E R Gagné
- Nephrology Division, Faculté de Médecine, Université de Sherbrooke, Québec, Canada
| | | | | | | | | |
Collapse
|
32
|
Gelb AB, Fye KH, Tischfield JA, Sahota AS, Sparks JW, Hancock DC, Sibley RK. Renal insufficiency secondary to 2,8-dihydroxyadenine urolithiasis. Hum Pathol 1992; 23:1081-5. [PMID: 1516930 DOI: 10.1016/0046-8177(92)90273-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A 48-year-old man with a history of recurrent urolithiasis and chronic renal failure underwent a nephrectomy for a renal mass. At surgery the mass proved to be a calculus impacted in a dilated calyx. Gross examination of the kidney revealed chalky white deposits in the deep medulla and papillary tips. Histologic examination revealed chronic interstitial nephritis with brown spicules within some tubular epithelial cells and larger deposits of brown crystals within tubular lumina, the interstitium of the medulla, and papillary tips. Polarization microscopy revealed individual crystals scattered throughout the renal parenchyma. Although the arrangement of the crystals was reminiscent of uric acid, and, in fact, a clinical diagnosis of gouty nephropathy was made, x-ray diffraction analysis demonstrated crystals of 2,8-dihydroxyadenine. Enzymatic studies confirmed the complete absence of adenine phosphoribosyltransferase activity in erythrocyte lysates.
Collapse
Affiliation(s)
- A B Gelb
- Department of Pathology, Stanford University Hospital, CA
| | | | | | | | | | | | | |
Collapse
|
33
|
Affiliation(s)
- R J Riese
- Center for Mineral Metabolism and Clinical Research University of Texas Southwestern Medical Center, Dallas 75235
| | | |
Collapse
|
34
|
Kaneko K, Fujimori S, Kumakawa T, Kamatani N, Akaoka I. Disturbance in the metabolism of 5'-methylthioadenosine and adenine in patients with neoplastic diseases, and in those with a deficiency in adenine phosphoribosyltransferase. Metabolism 1991; 40:918-21. [PMID: 1895956 DOI: 10.1016/0026-0495(91)90066-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
5'-Methylthioadenosine (MTA) produced during the synthesis of polyamines is degraded to adenine by MTA phosphorylase. This pathway is considered to be the main source of endogenous adenine. We determined the concentrations of MTA and adenine in control subjects and in those with a pathological disorder. In patients with active leukemias, as well as with other types of malignancies, the concentrations of MTA and adenine in the urine were elevated. These changes seemed to be the result of an accelerated production of MTA due to an accelerated biosynthesis of polyamine. In patients with adenine phosphoribosyltransferase (APRT) deficiency, the concentrations of adenine in the urine were elevated, presumably due to a disturbance in the catabolism of adenine. Although adenine is a potent inhibitor of MTA phosphorylase, APRT-deficient patients did not excrete MTA into urine in concentrations significantly larger than noted for control subjects. However, the amount of MTA excreted positively correlated with that of adenine in these patients, hence that accumulated adenine probably had a slight, but positive, inhibitory effect on the degradation of MTA.
Collapse
Affiliation(s)
- K Kaneko
- Central Laboratory of Analytical Biochemistry, Teikyo University School of Medicine, Tokyo, Japan
| | | | | | | | | |
Collapse
|
35
|
Abstract
Urinary stone formation depends on the degree of saturation of the urine with respect to potential stone-forming substances. Urine contains a range of electrolytes which ionise to different and variable degrees and which interact with one another in ways which influence their solubilities. These ionisations are themselves influenced by the pH of the urine which is another variable factor. Urinary organic molecules, which may or may not ionise and which may bear surface charges, also influence the solubility of the low molecular weight stone-constituents. Some other substances in the urine, such as glycosaminoglycans, can modify the ability of inorganic micro-crystals to aggregate and form stones. Environmental factors, other urinary tract pathology and genetic influences all predispose to urolithiasis, but many cases lack either an identifiable specific cause or the presence of recognisable risk factors. In the risk factor model of calcium stone formation there are pre-renal risk factors which lead to urinary risk factors and hence to the chemical risk factors of supersaturation and decreased ability to inhibit crystallisation. There are, in addition to these general factors which may act synergistically to produce urinary stones, several specific single enzyme defects which alter the urinary composition in such a way as to produce stones of a highly characteristic composition.
Collapse
|
36
|
Turker MS, Stambrook PJ, Tischfield JA, Smith AC, Martin GM. Allelic variation linked to adenine phosphoribosyltransferase locus in mouse teratocarcinoma cell line and feral-derived mouse strains. SOMATIC CELL AND MOLECULAR GENETICS 1989; 15:159-66. [PMID: 2928841 DOI: 10.1007/bf01535077] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Southern blot analysis reveals two distinct adenine phosphoribosyltransferase (APRT) alleles in the P-19 mouse teratocarcinoma cell line. One allele is identical to that observed in common laboratory mouse strains (Mus musculus domesticus). The restriction enzyme site variations between the two alleles occur in sequences located both upstream and downstream of the APRT gene, but not within it. Although the P-19 cell line was established from a C3H strain embryo (Mus musculus domesticus), a sixth generation ancestor of this embryo was a feral mouse (Mus musculus musculus). The restriction pattern of the variant APRT allele in P-19 is identical to that of a feral-derived Mus musculus musculus animal, establishing the origin of this allele in the P-19 cell line. A third, distinct APRT allele was found in a Mus spretus feral-derived mouse. Exploiting the differences between the two APRT alleles in the P-19 cell line, we have demonstrated their sequential loss in APRT-deficient clones.
Collapse
Affiliation(s)
- M S Turker
- Department of Pathology, University of Washington, Seattle 98195
| | | | | | | | | |
Collapse
|
37
|
Kamatani N, Kuroshima S, Terai C, Hakoda M, Nishioka K, Mikanagi K. Diagnosis of genotypes for adenine phosphoribosyltransferase (APRT) deficiency. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1989; 253A:51-8. [PMID: 2624232 DOI: 10.1007/978-1-4684-5673-8_8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- N Kamatani
- Institute of Rheumatology, Tokyo Women's Medical College, Japan
| | | | | | | | | | | |
Collapse
|
38
|
Salerno C, Werner A, Siems W, Gerber G, Giacomello A, Crifò C. Adenine uptake by human erythrocytes. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1989; 253B:543-6. [PMID: 2610145 DOI: 10.1007/978-1-4684-5676-9_81] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- C Salerno
- Laboratory of Biochemical and Clinical Analysis, University of Chieti, Italy
| | | | | | | | | | | |
Collapse
|
39
|
Kamatani N, Sonoda T, Nishioka K. Distribution of patients with 2,8-dihydroxyadenine urolithiasis and adenine phosphoribosyltransferase deficiency in Japan. J Urol 1988; 140:1470-2. [PMID: 3193517 DOI: 10.1016/s0022-5347(17)42075-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
2,8-Dihydroxyadenine urolithiasis is caused by genetic deficiencies of adenine phosphoribosyl-transferase. This disease has occurred in a large number of Japanese patients and more than half of all families with this disease are only partially deficient in enzyme activities (Japanese type adenine phosphoribosyltransferase deficiency). To clarify the reasons for the preponderance of Japanese cases we sent questionnaires to 948 Japanese urological departments. The data thus obtained indicated that 76 families had 2,8-dihydroxyadenine lithiasis and of 51 families in which adenine phosphoribosyltransferase activities were assayed 76 per cent were only partially deficient in adenine phosphoribosyltransferase activities. The distribution of the 2,8-dihydroxyadenine families was roughly similar to that of the population in Japan and the rates of the Japanese type adenine phosphoribosyltransferase deficiency families were not significantly different among the various parts of Japan. These data indicate that the wide distribution of the unique mutant gene, APRT*J, that was created many years ago in a Japanese ancestor, explains at least in part the large number of 2,8-dihydroxyadenine lithiasis and adenine phosphoribosyltransferase deficiency families among the Japanese.
Collapse
Affiliation(s)
- N Kamatani
- Institute of Rheumatology, Tokyo Women's Medical College, Japan
| | | | | |
Collapse
|
40
|
Hesse A, Thon A, Classen A, Birwé H. Diagnostic and therapy-control of inborn metabolic disorders by high-performance liquid chromatography: 2,8-dihydroxyadeninuria, xanthinuria. Chromatographia 1988. [DOI: 10.1007/bf02316445] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
41
|
Hidaka Y, Palella TD, O'Toole TE, Tarlé SA, Kelley WN. Human adenine phosphoribosyltransferase. Identification of allelic mutations at the nucleotide level as a cause of complete deficiency of the enzyme. J Clin Invest 1987; 80:1409-15. [PMID: 3680503 PMCID: PMC442397 DOI: 10.1172/jci113219] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
This study reports the first demonstration of specific mutations leading to human adenine phosphoribosyltransferase (APRT) deficiency. The molecular basis of the deficiency was investigated by determining the sequence of both alleles of a patient with a complete deficiency in APRT activity. A trinucleotide deletion, corresponding to phenylalanine on the deduced amino acid sequence, was confirmed on one allele. A single nucleotide insertion, immediately adjacent to the splice site at the 5' end of the fourth intervening sequence, was confirmed on the other allele. This insertion lead to aberrant splicing, as was demonstrated by the absence of exon 4 in the complementary DNA sequence and by altered RNase mapping analysis of the abnormal messenger RNA.
Collapse
Affiliation(s)
- Y Hidaka
- Department of Internal Medicine, University of Michigan Medical School, Ann Arbor 48109
| | | | | | | | | |
Collapse
|
42
|
Kamatani N, Kuroshima S, Terai C, Kawai K, Mikanagi K, Nishioka K. Selection of human cells having two different types of mutations in individual cells (genetic/artificial mutants). Application to the diagnosis of the heterozygous state for a type of adenine phosphoribosyltransferase deficiency. Hum Genet 1987; 76:148-52. [PMID: 3610146 DOI: 10.1007/bf00284912] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We have previously reported the establishment and characterization of B cell lines from patients and family members with various types of adenine phosphoribosyltransferase (APRT) deficiencies. These cell lines contain, at the APRT locus, three different alleles (APRT*1, APRT*Q0, and APRT*J) that are clearly distinguishable from each other. From five genetically heterozygous cell lines with two different genotypes (APRT*1/APRTQ0 and APRT*1/APRT*J), we have selected 48 clones resistant to 2,6-diaminopurine. Resistance to this adenine analogue is a characteristic of cells having defects in both of the APRT alleles in individual cells. The mutant clones from a cell line from a complete-type heterozygote had APRT activities close to zero (mean = 0.04 nmol/min per milligram protein) in the cell extracts, while 15 clones from four cell lines from the four Japanese-type heterozygotes had significant enzyme activities (mean = 3.88 nmol/min per milligram protein). Kinetic studies on two of the mutants from two Japanese-type heterozygous cell lines have shown that affinity to substrate 5-phosphoribosyl-1-pyrophosphate was reduced, indicating that APRT in those clones reflected the characteristics of the Japanese-type enzyme. The data presented here indicate that clones we obtained are genetic/artificial mutants, each having a genetic mutation in a single allele (APRT*J or APRT*Q0) and an artificially produced mutation in the other previously functional allele (APRT*1). The present procedure provided the only diagnostic method for Japanese-type APRT heterozygotes (APRT*1/APRT*J).
Collapse
|
43
|
Manyak MJ, Frensilli FJ, Miller HC. 2,8-Dihydroxyadenine urolithiasis: report of an adult case in the United States. J Urol 1987; 137:312-4. [PMID: 3806829 DOI: 10.1016/s0022-5347(17)43993-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
2,8-Dihydroxyadeninuria is a rare purine metabolic disorder that has been reported to have caused urolithiasis in 14 cases, mostly children. Excretion of the hydroxylated metabolites of adenine results from a deficiency of adenine phosphoribosyltransferase. The insoluble calculi have a similar chemical structure to uric acid and frequently are misdiagnosed as uric acid calculi. Management differs from that of uric acid urolithiasis. We report on an adult with 2,8-dihydroxyadenine urolithiasis in the United States.
Collapse
|
44
|
Christensen E, Brandt NJ, Laxdal T. Adenine phosphoribosyltransferase deficiency: a case diagnosed by GC-MS identification of 2,8-dihydroxyadenine in urinary crystals. J Inherit Metab Dis 1987; 10:187-94. [PMID: 3116337 DOI: 10.1007/bf01800046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Light microscopy of the urinary sediment from a child suffering from urinary tract disease showed massive crystalluria. Most of the sediment consisted of characteristic round and brownish crystals. 2,8-Dihydroxyadenine was identified in the crystals by means of gas chromatography-mass spectrometry. The diagnosis of adenine phosphoribosyltransferase deficiency was established by the finding of a very low activity of this enzyme in erythrocytes from the patient, and of half the normal activity in the patients. The patient was first treated with a diet low in purine and with a high liquid intake. She stayed symptomless on this regimen, but the crystalluria persisted. On low doses of allopurinol the crystalluria disappeared.
Collapse
Affiliation(s)
- E Christensen
- University Department of Paediatrics, Rigshospitalet, Copenhagen, Denmark
| | | | | |
Collapse
|
45
|
Fujimori S, Akaoka I, Takeuchi F, Kanayama H, Tatara K, Nishioka K, Kamatani N. Altered kinetic properties of a mutant adenine phosphoribosyltransferase. Metabolism 1986; 35:187-92. [PMID: 2418331 DOI: 10.1016/0026-0495(86)90122-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Three siblings in a Japanese family experienced recurrent 2,8-dihydroxyadenine urolithiasis despite the presence of adenine phosphoribosyltransferase (APRT) activities in the hemolysates (19.9% to 28.2% of normal value). However, studies on viable T cells from these patients indicated that APRT was not functional in viable cells. Further analysis of the partially purified enzymes from hemolysates disclosed that patient's APRT had a reduced affinity to 5-phosphoribosyl-1-pyrophosphate (PRPP). Seven healthy members of this family whose APRT functioned normally in viable T cells had the erythrocyte enzyme levels between the patients and normal individuals (38.2% to 65.6%), suggesting that they are carriers of the defective gene. These results indicate that the defective gene code a unique mutant APRT with a reduced affinity to PRPP, and the patients are homozygotes. The mutant enzyme was also shown to be more heat-stable than normal enzyme. However, since mutant enzyme, unlike normal enzyme, was insensitive to the stabilization effect of PRPP, the latter became more heat-stable than the former when the heat treatment was performed in the presence of PRPP. This type of defect with alterations in the kinetic and physical properties of APRT as described here is likely to be a common type of APRT deficiency in Japan.
Collapse
|
46
|
Nobori T, Yamanaka H, Kamatani N, Nishioka K, Mikanagi K. The prevalence of purine metabolic disorders in Japan. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1986; 195 Pt A:35-8. [PMID: 3014835 DOI: 10.1007/978-1-4684-5104-7_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
47
|
Kishi T, Kittaka E, Hyodo S, Kashiwa H, Karakawa T, Suzawa T, Sakura N, Sakano T, Usui T. Inhibition by adenine of in vitro immunological functions of normal and adenine phosphoribosyltransferase-deficient human lymphocytes. IMMUNOPHARMACOLOGY 1985; 10:157-62. [PMID: 3833854 DOI: 10.1016/0162-3109(85)90021-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Exogenous adenine strongly inhibited mitogen-stimulated transformation, cytoplasmic immunoglobulin production, and natural killer activity of human mononuclear leukocytes at the high concentration of 1.0 mM. These inhibitions by adenine were not due to cytotoxicity, because the viability of cultured cells was not affected by adenine up to 1.0 mM. As the magnitude of inhibition by adenine of these in vitro immunological functions was similar in normal and adenine phosphoribosyltransferase-deficient cells, its inhibition was not mediated by corresponding nucleotides. Adenine at the concentration of 0.1 mM caused 50% inhibition of cytoplasmic immunoglobulin production without alternating cell proliferation or viability. This suggests that an appropriate concentration of adenine may inhibit the differentiation of B cells to plasma cells rather than affecting cell proliferation. Understanding the mechanisms of adenine inhibition may lead to new approaches for the regulation of immune responses.
Collapse
|
48
|
Paglia DE, Valentine WN. Genetically induced enzyme anomalies: insights into normal cellular processes. Ann N Y Acad Sci 1985; 459:344-52. [PMID: 3006576 DOI: 10.1111/j.1749-6632.1985.tb20844.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
49
|
Fujimori S, Akaoka I, Sakamoto K, Yamanaka H, Nishioka K, Kamatani N. Common characteristics of mutant adenine phosphoribosyltransferases from four separate Japanese families with 2,8-dihydroxyadenine urolithiasis associated with partial enzyme deficiencies. Hum Genet 1985; 71:171-6. [PMID: 3876264 DOI: 10.1007/bf00283377] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
2,8-Dihydroxyadenine urolithiasis associated with partial deficiencies of adenine phosphoribosyltransferase (APRT) has been found only among Japanese families. All Caucasian patients with the same lithiasis are completely deficient in this enzyme. Partially purified APRT from one of the Japanese families with the lithiasis associated with a partial deficiency of APRT had a reduced affinity for 5-phosphoribosyl-1-pyrophosphate (PRPP). In the present investigations, we have shown that this characteristic is common in mutant enzymes from all the four separate Japanese urolithiasis families associated with partial APRT deficiencies so far tested. The mutant enzymes also had several other characteristics in common including increased resistance to heat in the absence of PRPP and reduced sensitivity to the stabilizing effect of PRPP. These data suggest that these families have a common mutant allele (APRT*J) at the APRT gene locus.
Collapse
|
50
|
Takeuchi F, Matsuta K, Miyamoto T, Enomoto S, Fujimori S, Akaoka I, Kamatani N, Nishioka K. Rapid method for the diagnosis of partial adenine phosphoribosyltransferase deficiencies causing 2,8-dihydroxyadenine urolithiasis. Hum Genet 1985; 71:167-70. [PMID: 4043967 DOI: 10.1007/bf00283376] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
More than half of the Japanese patients with 2,8-dihydroxyadenine urolithiasis only partially lack adenine phosphoribosyltransferase (APRT), while all the Caucasian patients with the same disease completely lack the enzyme. APRT activities in healthy heterozygotes for the complete APRT deficiencies were at the same levels as the Japanese patients, and simple enzyme assay does not distinguish between these two conditions. We have previously shown, using viable T-cells, that the enzyme was non-functional in the cells from the Japanese patients although they contain considerable APRT activities in the cell extracts. In the present investigations, we devised a rapid method using erythrocytes for the diagnosis of partial APRT deficiencies accompanied by severe impairment in adenine metabolism causing 2,8-dihydroxyadenine lithiasis. Thus, erythrocytes from three different families with 2,8-dihydroxyadenine urolithiasis associated with partial APRT deficiencies incorporated only minimal amounts of radioactive adenine, while normal erythrocytes incorporated significant amounts. These data indicate that severe impairment in adenine metabolism is shown not only in viable T-cells but also in viable erythrocytes. The present procedures provide a rapid method suitable for routine clinical use for the diagnosis of partial APRT deficiencies causing 2,8-dihydroxyadenine lithiasis.
Collapse
|