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Singh A, Misra R, Aggarwal A. Baseline adenosine receptor mRNA expression in blood as predictor of response to methotrexate therapy in patients with rheumatoid arthritis. Rheumatol Int 2019; 39:1431-1438. [PMID: 31203399 DOI: 10.1007/s00296-019-04344-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 06/09/2019] [Indexed: 12/29/2022]
Abstract
Methotrexate (MTX) reduces inflammation by increasing extracellular adenosine levels in rheumatoid arthritis (RA) patients. Adenosine acts via G-protein coupled receptors; ADORA1, ADORA2a, ADORA2b and ADORA3. We studied if baseline expression of whole blood adenosine receptors can predict response to MTX. RA patients [American College of Rheumatology/European-League-Against-Rheumatism (EULAR) 2010 criteria], Disease modifying anti-rheumatic drug (DMARD) naïve with active disease [Disease Activity Score 28 (DAS28) > 3.2] were enrolled. Blood samples were collected at baseline (n = 100) and at 4 months after therapy (n = 50). Patients were treated with MTX monotherapy. Based on EULAR response, patients were categorized into three groups i.e. good, moderate and non-responders. Adenosine receptors gene expression (ADORA1, ADORA2a, ADORA2b and ADORA3) in whole-blood RNA was measured using real-time PCR. HPRT1 was used as housekeeping gene. Receptor expression at baseline was correlated with response to MTX. All values are expressed as median (interquartile range). Hundred patients [87% females; age 40 (18) years]; duration of disease 24 (24.75) months; DAS28 4.7 (1.25) were enrolled. Fifty-one were classified as good, 28 moderate and 21 as non-responders. No expression of ADORA1 and ADORA2b was detected. Significant difference was observed in the expression levels of ADORA3 between good vs non-responder (P = 0.03) and moderate vs non-responder (P = 0.002). On ROC curve analysis, ADORA3 with cut-off value of less than - 0.60 (ΔCt) predicted non-response to MTX treatment (AUC: 0.7, P = 0.006). ADORA3 mRNA levels in whole blood may serve as a biomarker of response to MTX.
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MESH Headings
- Adult
- Arthritis, Rheumatoid/blood
- Arthritis, Rheumatoid/diagnosis
- Arthritis, Rheumatoid/drug therapy
- Arthritis, Rheumatoid/genetics
- Biomarkers, Pharmacological/blood
- Drug Resistance
- Female
- Humans
- Immunosuppressive Agents/therapeutic use
- Male
- Methotrexate/therapeutic use
- Middle Aged
- RNA, Messenger/blood
- RNA, Messenger/genetics
- Receptor, Adenosine A1/blood
- Receptor, Adenosine A1/genetics
- Receptor, Adenosine A2A/blood
- Receptor, Adenosine A2A/genetics
- Receptor, Adenosine A2B/blood
- Receptor, Adenosine A2B/genetics
- Receptor, Adenosine A3/blood
- Receptor, Adenosine A3/genetics
- Remission Induction
- Time Factors
- Treatment Outcome
- Young Adult
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Affiliation(s)
- Ankita Singh
- Department of Clinical Immunology and Rheumatology, Sanjay Gandhi Postgraduate Institute of Medical Sciences (SGPGIMS), Rae Bareli Road, Lucknow, Uttar Pradesh, 226014, India
| | - Ramnath Misra
- Department of Clinical Immunology and Rheumatology, Sanjay Gandhi Postgraduate Institute of Medical Sciences (SGPGIMS), Rae Bareli Road, Lucknow, Uttar Pradesh, 226014, India
| | - Amita Aggarwal
- Department of Clinical Immunology and Rheumatology, Sanjay Gandhi Postgraduate Institute of Medical Sciences (SGPGIMS), Rae Bareli Road, Lucknow, Uttar Pradesh, 226014, India.
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Saini S, Vats P, Bayen S, Gaur P, Ray K, Kishore K, Sartmyrzaeva M, Akunov A, Maripov A, Sarybaev A, Kumar B, Singh SB. Global expression profiling and pathway analysis in two different population groups in relation to high altitude. Funct Integr Genomics 2018; 19:205-215. [PMID: 30341547 DOI: 10.1007/s10142-018-0637-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Revised: 09/14/2018] [Accepted: 09/27/2018] [Indexed: 12/12/2022]
Abstract
High altitude (HA) is associated with number of stresses. Response of these stresses may vary in different populations depending upon altitude, duration of residency, ancestry, geographical variation, lifestyle, and ethnicities. For understanding population variability in transcriptome, array-based global gene expression profiling was performed on extracted RNA of male volunteers of two different lowland population groups, i.e., Indians and Kyrgyz, at baseline and day 7 of HA exposure (3200 m). A total of 97 genes were differentially expressed at basal in Kyrgyz as compared to Indians (82 downregulated and 15 upregulated), and 196 were differentially expressed on day 7 of HA (118 downregulated and 78 upregulated). Ingenuity Pathway Analysis and gene ontology highlighted eIF2 signaling with most significant negative activation z score at basal in Kyrgyz compared to Indians with downregulation of various L- and S-ribosomal proteins indicating marked translational repression. On day 7, cAMP-mediated signaling is most enriched with positive activation z score in Kyrgyz compared to Indians. Plasma cAMP levels were higher in Kyrgyz on day 7 compared to Indians. Extracellular adenosine levels were elevated in both the groups upon HA, but higher in Kyrgyz compared to Indians. Valedictory qRT-PCR showed upregulation of ADORA2B and CD73 along with downregulation of ENTs in Kyrgyz compared to Indians indicating elevated levels of extracellular nucleotides mainly adenosine and activation of extracellular cAMP-adenosine pathway which as per literature triggers endogenous protective mechanisms under stress conditions like hypoxia. Thus, transcriptome changes at HA are population-specific, and it may be necessary to take care while interposing similar results in different populations.
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Affiliation(s)
- Supriya Saini
- Defence Institute of Physiology and Allied Sciences, Lucknow Road, Timarpur, Delhi, 110054, India
| | - Praveen Vats
- Defence Institute of Physiology and Allied Sciences, Lucknow Road, Timarpur, Delhi, 110054, India.
- Endocrinology and Metabolism Division, Defence Institute of Physiology and Allied Sciences, Lucknow Road, Timarpur, Delhi, 110054, India.
| | | | - Priya Gaur
- Defence Institute of Physiology and Allied Sciences, Lucknow Road, Timarpur, Delhi, 110054, India
| | - Koushik Ray
- Defence Institute of Physiology and Allied Sciences, Lucknow Road, Timarpur, Delhi, 110054, India
| | - Krishna Kishore
- Defence Institute of Physiology and Allied Sciences, Lucknow Road, Timarpur, Delhi, 110054, India
| | - Meerim Sartmyrzaeva
- Kyrgyz Indian Mountain Biomedical Research Centre, Togolok Moldo Str 3, 720040, Bishkek, Kyrgyz Republic
| | - Almaz Akunov
- Kyrgyz Indian Mountain Biomedical Research Centre, Togolok Moldo Str 3, 720040, Bishkek, Kyrgyz Republic
| | - Abdirashit Maripov
- Kyrgyz Indian Mountain Biomedical Research Centre, Togolok Moldo Str 3, 720040, Bishkek, Kyrgyz Republic
| | - Akpay Sarybaev
- Kyrgyz Indian Mountain Biomedical Research Centre, Togolok Moldo Str 3, 720040, Bishkek, Kyrgyz Republic
| | - Bhuvnesh Kumar
- Defence Institute of Physiology and Allied Sciences, Lucknow Road, Timarpur, Delhi, 110054, India
| | - Shashi Bala Singh
- Defence Institute of Physiology and Allied Sciences, Lucknow Road, Timarpur, Delhi, 110054, India
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Yang D, Chen H, Koupenova M, Carroll SH, Eliades A, Freedman JE, Toselli P, Ravid K. A new role for the A2b adenosine receptor in regulating platelet function. J Thromb Haemost 2010; 8:817-27. [PMID: 20102488 DOI: 10.1111/j.1538-7836.2010.03769.x] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Activation of platelets is a critical component of atherothrombosis and plays a central role in the progression of unstable cardiovascular syndromes. Adenosine, acting through adenosine receptors, increases intracellular cAMP levels and inhibits platelet aggregation. The A2a adenosine receptor has already been recognized as a mediator of adenosine-dependent effects on platelet aggregation, and here we present a new role for the A2b adenosine receptor (A2bAR) in this process. METHODS AND RESULTS As compared with platelets from wild-type controls, platelets derived from A2bAR knockout mice have significantly greater ADP receptor activation-induced aggregation. Although mouse megakaryocytes and platelets express low levels of the A2bAR transcript, this gene is highly upregulated following injury and systemic inflammation in vivo. Under these conditions, A2bAR-mediated inhibition of platelet aggregation significantly increases. Our studies also identify a novel mechanism by which the A2bAR could regulate platelet aggregation; namely, ablation of the A2bAR leads to upregulated expression of the P2Y1 ADP receptor, whereas A2bAR-mediated or direct elevation of cAMP has the opposite effect. Thus, the A2bAR regulates platelet function beyond mediating the immediate effect of adenosine on aggregation. CONCLUSIONS Taken together, these investigations show for the first time that the platelet A2bAR is upregulated under stress in vivo, plays a significant role in regulating ADP receptor expression, and inhibits agonist-induced platelet aggregation.
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MESH Headings
- Adenosine A2 Receptor Agonists
- Adenosine Diphosphate/blood
- Adenosine-5'-(N-ethylcarboxamide)/pharmacology
- Animals
- Blood Platelets/drug effects
- Blood Platelets/metabolism
- Cells, Cultured
- Cyclic AMP/blood
- Disease Models, Animal
- Femoral Artery/injuries
- Femoral Artery/metabolism
- Genotype
- Inflammation/chemically induced
- Inflammation/genetics
- Inflammation/metabolism
- Lipopolysaccharides
- Megakaryocytes/metabolism
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Phenotype
- Platelet Aggregation/drug effects
- Platelet Aggregation/genetics
- RNA, Messenger/blood
- Receptor, Adenosine A2B/blood
- Receptor, Adenosine A2B/deficiency
- Receptor, Adenosine A2B/genetics
- Receptors, Purinergic P2/blood
- Receptors, Purinergic P2/genetics
- Receptors, Purinergic P2Y1
- Time Factors
- Up-Regulation
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Affiliation(s)
- D Yang
- Department of Biochemistry, Boston University School of Medicine, Boston, MA 02118, USA
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Bazzichi L, Trincavelli L, Rossi A, De Feo F, Lucacchini A, Bombardieri S, Martini C. A2B adenosine receptor activity is reduced in neutrophils from patients with systemic sclerosis. Arthritis Res Ther 2004; 7:R189-95. [PMID: 15743465 PMCID: PMC1065314 DOI: 10.1186/ar1468] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2004] [Revised: 10/22/2004] [Accepted: 10/26/2004] [Indexed: 01/19/2023] Open
Abstract
We conducted the present study to investigate protein expression and functioning of A2A and A2B adenosine receptors (ARs) in neutrophils of patients affected by systemic sclerosis (SSc). The presence of A2A and A2B ARs was assessed by immunoblotting using specific antibodies. Equilibrium A2A and A2B ARs binding parameters were evaluated by radioligand binding assay. Functional studies were conducted to investigate coupling of the A2B AR to the adenylyl cyclase pathway. This is the first report of the use of Western blot analysis to confirm the presence of A2A and A2B ARs in human neutrophils. No significant changes in A2A AR binding parameters or expression levels were detected between SSc patients and healthy control individuals. A significant decrease (65%) in the maximum density of A2B AR binding sites occurred in SSc neutrophils, whereas no changes in the affinity constant values were found. Moreover, a decrease in A2B AR mediated adenylyl cyclase activity was observed in patients with SSc. Our findings demonstrate the occurrence of selective alterations in A2B AR density and signalling in SSc.
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Affiliation(s)
- Laura Bazzichi
- Department of Internal Medicine, Division of Rheumatology, University of Pisa, Pisa, Italy
| | - Letizia Trincavelli
- Departments of Psychiatry, Neurobiology, Pharmacology and Biotechnology, University of Pisa, Pisa, Italy
| | - Alessandra Rossi
- Departments of Psychiatry, Neurobiology, Pharmacology and Biotechnology, University of Pisa, Pisa, Italy
| | - Francesca De Feo
- Departments of Psychiatry, Neurobiology, Pharmacology and Biotechnology, University of Pisa, Pisa, Italy
| | - Antonio Lucacchini
- Departments of Psychiatry, Neurobiology, Pharmacology and Biotechnology, University of Pisa, Pisa, Italy
| | - Stefano Bombardieri
- Department of Internal Medicine, Division of Rheumatology, University of Pisa, Pisa, Italy
| | - Claudia Martini
- Departments of Psychiatry, Neurobiology, Pharmacology and Biotechnology, University of Pisa, Pisa, Italy
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