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Mushtaq MU, Shahzad M, Tariq E, Iqbal Q, Chaudhary SG, Zafar MU, Anwar I, Ahmed N, Bansal R, Singh AK, Abhyankar SH, Callander NS, Hematti P, McGuirk JP. Outcomes with mismatched unrelated donor allogeneic hematopoietic stem cell transplantation in adults: A systematic review and meta-analysis. Front Oncol 2022; 12:1005042. [PMID: 36276084 PMCID: PMC9583270 DOI: 10.3389/fonc.2022.1005042] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 09/15/2022] [Indexed: 11/19/2022] Open
Abstract
Background Allogeneic hematopoietic stem cell transplantation (HSCT) is a potentially curative therapy for various hematologic disorders. Alternative donor strategies such as mismatched unrelated donors (MMUD) offer the option of HSCT to patients lacking a human leukocyte antigen (HLA)-matched donor. We conducted a systematic review and meta-analysis to evaluate outcomes after MMUD-HSCT. Methods A literature search was performed on PubMed, Cochrane Library, and ClinicalTrials.gov from the inception date through April 6, 2022. After screening 2477 manuscripts, 19 studies were included. Data was extracted following the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines. Pooled analysis was done using the meta-package by Schwarzer et al. Proportions with 95% confidence intervals (CI) were computed. Results A total of 3336 patients from 19 studies were included. The median age was 52.1 years, and 53% of recipients were males. The graft source was bone marrow in 19% and peripheral blood stem cells in 81% of recipients. The median time to transplant from hematologic diagnosis was 10 (1-247) months. Hematologic diagnoses included myeloid (82.9%), lymphoid (41.1%), and other disorders (3%). The reduced intensity and myeloablative conditioning were used in 65.6% and 32% of recipients, respectively. In-vivo T-cell depletion was performed in 56.7% of the patients. Most patients had one (87.9%) or two (11.4%) antigen HLA-mismatch. The pooled 1-year overall survival (OS) was 63.9% (95% CI 0.57-0.71, n=1426/2706), and the pooled 3-year OS was 42.1% (95% CI 0.34.2-0.50, n=907/2355). The pooled progression-free survival was 46.6% (95% CI 0.39-0.55, n=1295/3253) after a median follow-up of 1.8 (range 1-6) years. The pooled relapse rate was 26.8% (95% CI 0.22-0.32, n=972/3253) after a median follow-up of 2.25 (1-3) years. The pooled incidence of acute (grade II-IV) graft-versus-host disease (GVHD) and chronic GVHD was 36.4% (95% CI 0.31-0.42, n=1131/3030) and 41.2% (95% CI 0.35-0.48, n=1337/3228), respectively. The pooled non-relapse mortality was 22.6% (95% CI 0.17-0.29, n=888/3196) after a median follow-up of 2.6 (1-5) years. Conclusion MMUD-HSCT has demonstrated favorable outcomes with an acceptable toxicity profile. It represents a promising option in patients lacking an HLA-matched or haploidentical donor and may expand HSCT access to underrepresented racial and ethnic populations.
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Affiliation(s)
- Muhammad Umair Mushtaq
- Division of Hematologic Malignancies and Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
- *Correspondence: Muhammad Umair Mushtaq,
| | - Moazzam Shahzad
- Division of Hematologic Malignancies and Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
- Moffitt Cancer Center, University of South Florida, Tampa, FL, United States
| | - Ezza Tariq
- Division of Hematologic Malignancies and Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
- Department of Medicine, University of Toledo Medical Center, Toledo, OH, United States
| | - Qamar Iqbal
- Division of Hematologic Malignancies and Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Sibgha Gull Chaudhary
- Division of Hematologic Malignancies and Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Muhammad U. Zafar
- Division of Hematologic Malignancies and Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Iqra Anwar
- Division of Hematologic Malignancies and Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Nausheen Ahmed
- Division of Hematologic Malignancies and Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Rajat Bansal
- Division of Hematologic Malignancies and Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Anurag K. Singh
- Division of Hematologic Malignancies and Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Sunil H. Abhyankar
- Division of Hematologic Malignancies and Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Natalie S. Callander
- School of Medicine and Public Health, University of Wisconsin, Madison, WI, United States
| | - Peiman Hematti
- School of Medicine and Public Health, University of Wisconsin, Madison, WI, United States
| | - Joseph P. McGuirk
- Division of Hematologic Malignancies and Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
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Mushtaq MU, Shahzad M, Shah AY, Chaudhary SG, Zafar MU, Anwar I, Neupane K, Khalid A, Ahmed N, Bansal R, Balusu R, Singh AK, Abhyankar SH, Callander NS, Hematti P, McGuirk JP. Impact of natural killer cells on outcomes after allogeneic hematopoietic stem cell transplantation: A systematic review and meta-analysis. Front Immunol 2022; 13:1005031. [PMID: 36263054 PMCID: PMC9574024 DOI: 10.3389/fimmu.2022.1005031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 09/09/2022] [Indexed: 11/13/2022] Open
Abstract
Background Natural killer (NK) cells play a vital role in early immune reconstitution following allogeneic hematopoietic stem cell transplantation (HSCT). Methods A literature search was performed on PubMed, Cochrane, and Clinical trials.gov through April 20, 2022. We included 21 studies reporting data on the impact of NK cells on outcomes after HSCT. Data was extracted following the PRISMA guidelines. Pooled analysis was done using the meta-package (Schwarzer et al.). Proportions with 95% confidence intervals (CI) were computed. Results We included 1785 patients from 21 studies investigating the impact of NK cell reconstitution post-HSCT (8 studies/1455 patients), stem cell graft NK cell content (4 studies/185 patients), therapeutic NK cell infusions post-HSCT (5 studies/74 patients), and pre-emptive/prophylactic NK cell infusions post-HSCT (4 studies/77 patients). Higher NK cell reconstitution was associated with a better 2-year overall survival (OS) (high: 77%, 95%CI 0.73-0.82 vs low: 55%, 95%CI 0.37-0.72; n=899), however, pooled analysis for relapse rate (RR) or graft versus host disease (GVHD) could not be performed due to insufficient data. Higher graft NK cell content demonstrated a trend towards a better pooled OS (high: 65.2%, 95%CI 0.47-0.81 vs low: 46.5%, 95%CI 0.24-0.70; n=157), lower RR (high: 16.9%, 95%CI 0.10-0.25 vs low: 33%, 95%CI 0.04-0.72; n=157), and lower acute GVHD incidence (high: 27.6%, 95%CI 0.20-0.36 vs low: 49.7%, 95%CI 0.26-0.74; n=157). Therapeutic NK or cytokine-induced killer (CIK) cell infusions for hematologic relapse post-HSCT reported an overall response rate (ORR) and complete response (CR) of 48.9% and 11% with CIK cell infusions and 82.8% and 44.8% with NK cell infusions, respectively. RR, acute GVHD, and chronic GVHD were observed in 55.6% and 51.7%, 34.5% and 20%, and 20.7% and 11.1% of patients with CIK and NK cell infusions, respectively. Pre-emptive donor-derived NK cell infusions to prevent relapse post-HSCT had promising outcomes with 1-year OS of 69%, CR rate of 42%, ORR of 77%, RR of 28%, and acute and chronic GVHD rates of 24.9% and 3.7%, respectively. Conclusion NK cells have a favorable impact on outcomes after HSCT. The optimal use of NK cell infusions post-HSCT may be in a pre-emptive fashion to prevent disease relapse.
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Affiliation(s)
- Muhammad Umair Mushtaq
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
- *Correspondence: Muhammad Umair Mushtaq,
| | - Moazzam Shahzad
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
- Moffitt Cancer Center, University of South Florida, Tampa, FL, United States
| | - Amna Y. Shah
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Sibgha Gull Chaudhary
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Muhammad U. Zafar
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Iqra Anwar
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Karun Neupane
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Ayesha Khalid
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Nausheen Ahmed
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Rajat Bansal
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Ramesh Balusu
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Anurag K. Singh
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Sunil H. Abhyankar
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Natalie S. Callander
- University of Wisconsin School of Medicine and Public Health, Madison, WI, United States
| | - Peiman Hematti
- University of Wisconsin School of Medicine and Public Health, Madison, WI, United States
| | - Joseph P. McGuirk
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
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Shahzad M, Chaudhary SG, Zafar MU, Hassan MA, Hussain A, Ali F, Anwar I, Ahmed M, Ahmed N, Khurana S, Rauf MA, Anwar F, Hematti P, Callander NS, Abhyankar SH, McGuirk JP, Mushtaq MU. Impact of COVID-19 in Hematopoietic stem cell transplant recipients: A systematic review and meta-analysis. Transpl Infect Dis 2022; 24:e13792. [PMID: 35030267 DOI: 10.1111/tid.13792] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 12/23/2021] [Accepted: 01/03/2022] [Indexed: 12/15/2022]
Abstract
BACKGROUND Hematopoietic stem cell transplant (HSCT) recipients are at increased risk of mortality and morbidity with Coronavirus Disease 2019 (COVID-19) due to severe immune dysfunction. METHODS A literature search was performed on PubMed, Cochrane, and Clinical trials.gov from the date of inception to 12/08/2021. We identified 19 original studies reporting data on COVID-19 in HSCT recipients after screening 292 articles. Data was extracted following PRISMA guidelines. Quality evaluation was done using the NIH quality assessment tool. Inter-study variance was calculated using Der Simonian-Laird Estimator. Pooled analysis was conducted using MetaXL. A random-effects model was used to estimate the proportions with 95% confidence intervals (CI). RESULTS Of 6711 patients in 19 studies, 2031 HSCT patients with SARS-CoV-2 infection were analyzed. The median age of patients was 56.9 (range 1-81.6) years, and 63% patients were men according to 14 studies. The median time from transplant to SARS-CoV-2 infection for autologous (auto) and allogeneic (allo) HSCT patients was 23.2 (0.33- 350.5) months and 16.4 (0.2- 292.7) months respectively. The median follow-up time after COVID-19 diagnosis was 28 (0-262) days. The COVID-19 mortality rate was 19% (95% CI 0.15- 0.24, I2 = 76%, n = 373/2031). The pooled mortality rate was 17% (95% CI 0.12- 0.24, I2 = 78%, n = 147/904) in auto-HSCT patients and 21% (95% CI 0.16- 0.25, I2 = 60%, n = 231/1103) in allo-HSCT patients. CONCLUSIONS HSCT recipients have a high risk of mortality and clinical complications due to COVID-19. There is a need for ongoing vigilance, masks, and social distancing, vaccination, and aggressive management of SARS-CoV-2 infection in HSCT recipients. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Moazzam Shahzad
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS
| | - Sibgha Gull Chaudhary
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS
| | - Muhammad U Zafar
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS
| | - Maha A Hassan
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS
| | - Ali Hussain
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS
| | - Fatima Ali
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS
| | - Iqra Anwar
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS
| | - Mamoon Ahmed
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS
| | - Nausheen Ahmed
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS
| | - Sharad Khurana
- Division of Hematology/Oncology, University of Arizona College of Medicine, Tucson, AZ
| | - Muhammad A Rauf
- Division of Transplant Surgery, Vanderbilt University, Nashville, TN
| | - Faiz Anwar
- Division of Hematology/Oncology, Cleveland Clinic, Cleveland, OH
| | - Peiman Hematti
- Division of Hematology/Oncology, University of Wisconsin School of Medicine & Public Health, Madison, WI
| | - Natalie S Callander
- Division of Hematology/Oncology, University of Wisconsin School of Medicine & Public Health, Madison, WI
| | - Sunil H Abhyankar
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS
| | - Joseph P McGuirk
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS
| | - Muhammad Umair Mushtaq
- Division of Hematologic Malignancies & Cellular Therapeutics, University of Kansas Medical Center, Kansas City, KS
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Garcia-Ropero A, Santos-Gallego CG, Zafar MU, Badimon JJ. Dual versus triple antithrombotic therapy: is there a role for direct oral anticoagulants in arterial thrombosis? Drugs Today (Barc) 2019; 55:197-214. [PMID: 30938374 DOI: 10.1358/dot.2019.55.3.2903216] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The number of patients receiving dual antiplatelet therapy with an additional indication for long-term oral anticoagulation has substantially increased over time. This population is facing an unacceptable risk of bleeding events, particularly among elderly individuals, who are especially vulnerable to complications. Further strategies to minimize this bleeding risk, including various drug combinations, different dosage regimens and even numerous attempts to find the appropriate duration of the treatment, have been evaluated in a multitude of randomized control trials. Moreover, the recent incorporation of the direct oral anticoagulants (DOACs) to the therapeutic armamentarium may represent an alternative to treat such patients, since they have demonstrated to be noninferior to the classic vitamin K antagonists and with lower bleeding rates. The aim of this review is to summarize the most recent literature on the use of DOACs in patients with an indication for dual antiplatelet therapy (mostly subjects with coronary artery disease) and also an established indication for chronic anticoagulation (chiefly individuals with nonvalvular atrial fibrillation). The role of DOACs in ischemic heart disease alone is also discussed.
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Affiliation(s)
- A Garcia-Ropero
- Atherothrombosis Research Unit, Mount Sinai Heart, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - C G Santos-Gallego
- Atherothrombosis Research Unit, Mount Sinai Heart, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - M U Zafar
- Atherothrombosis Research Unit, Mount Sinai Heart, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - J J Badimon
- Atherothrombosis Research Unit, Mount Sinai Heart, Icahn School of Medicine at Mount Sinai, New York, New York, USA.
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Zafar MU, Badimon JJ, Escolar G. Incomplete reversibility of platelet inhibition following prolonged exposure to ticagrelor: comment. J Thromb Haemost 2018; 16:605-606. [PMID: 29314712 DOI: 10.1111/jth.13941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Indexed: 11/29/2022]
Affiliation(s)
- M U Zafar
- Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - J J Badimon
- Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - G Escolar
- Department of Hematopathology, Hospital Clinic, Barcelona, Spain
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Zafar MU, Santos-Gallego C, Vorchheimer DA, Viles-Gonzalez JF, Elmariah S, Giannarelli C, Sartori S, Small DS, Jakubowski JA, Fuster V, Badimon JJ. Platelet function normalization after a prasugrel loading-dose: time-dependent effect of platelet supplementation. J Thromb Haemost 2013; 11:100-6. [PMID: 23137352 PMCID: PMC4802976 DOI: 10.1111/jth.12058] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Hemostatic benefits of platelet transfusions in thienopyridine-treated acute coronary syndrome (ACS) patients may be compromised by residual metabolite in circulation. OBJECTIVES To estimate the earliest time after a prasugrel loading-dose when added platelets are no longer inhibited by prasugrel's active metabolite. METHODS Baseline platelet reactivity of healthy subjects (n=25, 30 ± 5 years, 68% male) on ASA 325 mg was tested using maximum platelet aggregation (MPA, ADP 20 μm) and VerifyNow(®) P2Y12 and was followed by a 60 mg prasugrel loading-dose. At 2, 6, 12 and 24 h post-dose, fresh concentrated platelets from untreated donors were added ex-vivo to subjects' blood, raising platelet counts by 0% (control), 40%, 60% and 80%. To estimate the earliest time when prasugrel's active metabolite's inhibitory effect on the added platelets ceases, platelet function in supplemented samples was compared across time-points to identify the time when effect of supplementation on platelet function stabilized (i.e. the increase in platelet reactivity was statistically similar to that at the next time-point). RESULTS Supplemented samples showed concentration-dependent increases in platelet reactivity vs. respective controls by both MPA and VerifyNow(®) at all assessment time-points. For each supplementation level, platelet reactivity showed a sharp increase from 2 to 6 h but was stable (P=NS) between 6 and 12 h. CONCLUSIONS The earliest measured time when supplemented platelets were not inhibited by circulating active metabolite of prasugrel was 6 h after a prasugrel loading-dose. These findings may have important implications for prasugrel-treated ACS patients requiring platelet transfusions during surgery.
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Affiliation(s)
- M U Zafar
- Mount Sinai School of Medicine, New York, NY Eli Lilly and Company, Indianapolis, IN, USA
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Choi BG, Vilahur G, Cardoso L, Fritton JC, Ibanez B, Zafar MU, Yadegar D, Speidl WS, Schaffler MB, Fuster V, Badimon JJ. Ovariectomy increases vascular calcification via the OPG/RANKL cytokine signalling pathway. Eur J Clin Invest 2008; 38:211-7. [PMID: 18279396 PMCID: PMC4811027 DOI: 10.1111/j.1365-2362.2008.01930.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
BACKGROUND Observational studies suggest a strong relationship between menopause and vascular calcification. Receptor activator of nuclear factor-kappaBeta ligand (RANKL) and osteoprotegerin (OPG) are critical regulators of bone remodelling and modulate vascular calcification. We assessed the hypothesis that ovariectomy increases vascular calcification via the OPG/RANKL axis. MATERIALS AND METHODS Age-matched sexually mature rabbits were randomized to ovariectomy (OVX, n = 12) or sham procedure (SHAM, n = 12). One month post-procedure, atherosclerosis was induced by 15 months 0.2%-cholesterol diet and endothelial balloon denudations (at months 1 and 3). Aortic atherosclerosis was assessed in vivo by magnetic resonance imaging (MRI) at months 9 and 15. At sacrifice, aortas were harvested for ex vivo microcomputed tomography (microCT) and molecular analysis of the vascular tissue. RESULTS Vascular calcification density and calcific particle number were significantly greater in OVX than SHAM (8.4 +/- 2.8 vs. 1.9 +/- 0.6 mg cm(-3), P = 0.042, and 94 +/- 26 vs. 33 +/- 7 particles cm(-3), P = 0.046, respectively). Calcification morphology, as assessed by the arc angle subtended by the largest calcific particle, showed no difference between groups (OVX 33 +/- 7 degrees vs. SHAM 33 +/- 5 degrees , P = 0.99). By Western blot analysis, OVX increased the vascular OPG:RANKL ratio by 66%, P = 0.029, primarily by decreasing RANKL (P = 0.019). At month 9, MRI demonstrated no difference in atheroma volume between OVX and SHAM, and no significant change was seen by the end of the study. CONCLUSIONS In contrast to bone, vascular OPG:RANKL ratio increased in response to ovariectomy with a corresponding fourfold increase in arterial calcification. This diametrical organ-specific response may explain the comorbid association of osteoporosis with calcifying atherosclerosis in post-menopausal women.
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Affiliation(s)
- B G Choi
- Mount Sinai School of Medicine, New York, USA
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Zafar MU, Vilahur G, Choi BG, Ibanez B, Viles-Gonzalez JF, Salas E, Badimon JJ. A novel anti-ischemic nitric oxide donor (LA419) reduces thrombogenesis in healthy human subjects. J Thromb Haemost 2007; 5:1195-200. [PMID: 17389007 DOI: 10.1111/j.1538-7836.2007.02543.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
BACKGROUND Platelet and endothelial production of nitric oxide (NO) is known to be impaired in coronary artery disease patients. Compounds that release NO (e.g. nitrates) have antiplatelet effects, but at supratherapeutic doses with hypotensive side effects. OBJECTIVES To investigate the antithrombotic effect on human blood of a novel NO donor (LA419) with known anti-ischemic properties but without hypotensive side effects and to compare with abciximab. PATIENTS/METHODS Healthy subjects (n = 8; 32 +/- 3 years) received daily aspirin starting three days prior to the study day. Treatments (LA419 10 and 20 microm, and abciximab 4 microm) were added ex vivo to non-anticoagulated blood, and the antithrombotic properties were assessed by measuring changes in thrombus size from pretreatment baseline in the Badimon perfusion chamber at low and high shear rates. Platelet surface adhesion using a Cone and Platelet Analyzer (CPA) and platelet fibrinogen-receptor activation with flow cytometry were also evaluated. RESULTS At low shear rates, LA419 displayed a reduction in thrombus area of 43% +/- 8% (10 microm) and 56% +/- 6% (20 microm), whereas at high shear rates the reductions were 44% +/- 3% (10 microm) and 62% +/- 6% (20 microm). Platelet surface adhesion with the CPA was also reduced. Abciximab exhibited a strong inhibitory effect on thrombus formation, platelet surface adhesion and fibrinogen receptor activation. CONCLUSIONS The novel NO donor, LA419, shows a strong antithrombotic effect in human blood, which is comparable to abciximab, especially under high shear rate conditions. Our observations suggest that the availability of an NO donor could prove beneficial in the prevention of thrombotic complications of cardiovascular disease. Further clinical studies are warranted.
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Affiliation(s)
- M U Zafar
- Cardiovascular Biology Research Laboratory, Mount Sinai School of Medicine, NY, USA
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Vilahur G, Choi BG, Zafar MU, Viles-Gonzalez JF, Vorchheimer DA, Fuster V, Badimon JJ. Normalization of platelet reactivity in clopidogrel-treated subjects. J Thromb Haemost 2007; 5:82-90. [PMID: 17239165 DOI: 10.1111/j.1538-7836.2006.02245.x] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Aspirin (ASA) + clopidogrel are commonly used in acute coronary syndrome (ACS), but persistent antiplatelet effects may complicate surgery. METHODS AND RESULTS To study the possibility of normalizing platelet reactivity after ASA + clopidogrel treatment, 11 healthy subjects received a 325-mg ASA + clopidogrel loading dose (300 or 600 mg dependent on study arm), followed by 81 mg of ASA + 75 mg of clopidogrel daily for 2 days. Platelet reactivity was assessed by light transmittance aggregometry (LTA) [challenged by adenosine diphosphate (ADP), arachidonic acid (AA), collagen, and thrombin receptor activating peptide (TRAP)] and flow cytometry for platelet activation by GPIIb/IIIa receptor exposure pretreatment, 4 and 72 h postload. To normalize platelet reactivity, increasing amounts of pooled platelets from five untreated volunteers [volunteers (V)-platelet-rich plasma (PRP)] were added ex vivo to the subject's PRP (S-PRP). At both 4 and 72 h, 40% and 50% V-PRP were needed to overcome platelet disaggregation in the 300 or 600 mg arms, respectively, after ADP challenge; an additional 10% V-PRP fully normalized aggregation. Recovery of function was linear with each incremental increase of V-PRP. ADP-induced GPIIb/IIIa activation showed the same pattern as LTA (r = 0.74). Forty percent V-PRP was required to normalize platelet function to AA, collagen, and TRAP. CONCLUSION Our results suggest that the pre-operative transfusion of 10 platelet concentrate units (the equivalent of 40% V-PRP) after a 300-mg clopidogrel loading or 12.5 units (50% V-PRP) after a 600 mg loading may adequately reverse clopidogrel-induced platelet disaggregation to facilitate postoperative hemostasis. An additional 2.5 units fully normalized platelet function. The potential clinical implications of our observations could include shorter hospitalizations and reduced bleeding complications. But these observations should be fully explored in an in vivo clinical setting with clopidogrel-treated patients before and after surgery.
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Affiliation(s)
- G Vilahur
- Cardiovascular Biology Research Laboratory, Mount Sinai School of Medicine, New York, NY 10029, USA
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