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Christakoudi S, Hernandez-Fuentes MP. Lack of adjustment for confounding could lead to misleading conclusions. Am J Transplant 2017; 17:2505-2506. [PMID: 28727250 DOI: 10.1111/ajt.14439] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 07/12/2017] [Accepted: 07/12/2017] [Indexed: 01/25/2023]
Affiliation(s)
- S Christakoudi
- MRC Centre for Transplantation, King's College London, London, UK.,Biostatistics and Health Informatics, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - M P Hernandez-Fuentes
- MRC Centre for Transplantation, King's College London, London, UK.,UCB Pharma, Immunology Therapeutic Area, Slough, UK
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2
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Bestard O, Crespo E, Stein M, Lúcia M, Roelen DL, de Vaal YJ, Hernandez-Fuentes MP, Chatenoud L, Wood KJ, Claas FH, Cruzado JM, Grinyó JM, Volk HD, Reinke P. Cross-validation of IFN-γ Elispot assay for measuring alloreactive memory/effector T cell responses in renal transplant recipients. Am J Transplant 2013; 13:1880-90. [PMID: 23763435 DOI: 10.1111/ajt.12285] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Revised: 02/12/2013] [Accepted: 03/25/2013] [Indexed: 01/25/2023]
Abstract
Assessment of donor-specific alloreactive memory/effector T cell responses using an IFN-γ Elispot assay has been suggested to be a novel immune-monitoring tool for evaluating the cellular immune risk in renal transplantation. Here, we report the cross-validation data of the IFN-γ Elispot assay performed within different European laboratories taking part of the EU RISET consortium. For this purpose, development of a standard operating procedure (SOP), comparisons of lectures of IFN-γ plates assessing intra- and interlaboratory assay variability of allogeneic or peptide stimuli in both healthy and kidney transplant individuals have been the main objectives. We show that the use of a same SOP and count-settings of the Elispot bioreader allow low coefficient variation between laboratories. Frozen and shipped samples display slightly lower detectable IFN-γ frequencies than fresh samples. Importantly, a close correlation between different laboratories is obtained when measuring high frequencies of antigen-specific primed/memory T cell alloresponses. Interestingly, significant high donor-specific alloreactive T cell responses can be similarly detected among different laboratories in kidney transplant patients displaying histological patterns of acute T cell mediated rejection. In conclusion, assessment of circulating alloreactive memory/effector T cells using an INF-γ Elispot assay can be accurately achieved using the same SOP, Elispot bioreader and experienced technicians in kidney transplantation.
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Affiliation(s)
- O Bestard
- Nephrology Department, Renal Transplant Unit, Bellvitge University Hospital, Barcelona University, Barcelona, Spain.
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Haynes LD, Jankowska-Gan E, Sheka A, Keller MR, Hernandez-Fuentes MP, Lechler RI, Seyfert-Margolis V, Turka LA, Newell KA, Burlingham WJ. Donor-specific indirect pathway analysis reveals a B-cell-independent signature which reflects outcomes in kidney transplant recipients. Am J Transplant 2012; 12:640-8. [PMID: 22151236 PMCID: PMC3374729 DOI: 10.1111/j.1600-6143.2011.03869.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [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: 01/25/2023]
Abstract
To investigate the role of donor-specific indirect pathway T cells in renal transplant tolerance, we analyzed responses in peripheral blood of 45 patients using the trans-vivo delayed-type hypersensitivity assay. Subjects were enrolled into five groups-identical twin, clinically tolerant (TOL), steroid monotherapy (MONO), standard immunosuppression (SI) and chronic rejection (CR)-based on transplant type, posttransplant immunosuppression and graft function. The indirect pathway was active in all groups except twins but distinct intergroup differences were evident, corresponding to clinical status. The antidonor indirect pathway T effector response increased across patient groups (TOL < MONO < SI < CR; p < 0.0001) whereas antidonor indirect pathway T regulatory response decreased (TOL > MONO = SI > CR; p < 0.005). This pattern differed from that seen in circulating naïve B-cell numbers and in a cross-platform biomarker analysis, where patients on monotherapy were not ranked closest to TOL patients, but rather were indistinguishable from chronically rejecting patients. Cross-sectional analysis of the indirect pathway revealed a spectrum in T-regulatory:T-effector balance, ranging from TOL patients having predominantly regulatory responses to CR patients having predominantly effector responses. Therefore, the indirect pathway measurements reflect a distinct aspect of tolerance from the recently reported elevation of circulating naïve B cells, which was apparent only in recipients off immunosuppression.
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Affiliation(s)
- L. D. Haynes
- University of Wisconsin, Department of Surgery, Transplant Division, Madison, WI
| | - E. Jankowska-Gan
- University of Wisconsin, Department of Surgery, Transplant Division, Madison, WI
| | - A. Sheka
- University of Wisconsin, Department of Surgery, Transplant Division, Madison, WI
| | - M. R. Keller
- University of Wisconsin, Department of Surgery, Transplant Division, Madison, WI
| | | | - R. I. Lechler
- Kings College London, MRC Centre for Transplantation, London, UK
| | - V. Seyfert-Margolis
- Food and Drug Administration, Department of Health and Human Services, Silver Spring, MD
| | - L. A. Turka
- Beth Israel Deaconess Medical Center (BIDMC), Harvard Medical School, Boston, MA and Immune Tolerance Network, Bethesda, MD
| | - K. A. Newell
- Emory University, Department of Surgery and the Emory Transplant Center, Atlanta, GA
| | - W. J. Burlingham
- University of Wisconsin, Department of Surgery, Transplant Division, Madison, WI,Corresponding author: William J. Burlingham,
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4
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Afzali B, Mitchell P, Scottà C, Canavan J, Edozie FC, Fazekasova H, Lord GM, John S, Barber LD, Hernandez-Fuentes MP, Lechler RI, Lombardi G. Relative resistance of human CD4(+) memory T cells to suppression by CD4(+) CD25(+) regulatory T cells. Am J Transplant 2011; 11:1734-42. [PMID: 21749646 PMCID: PMC3815568 DOI: 10.1111/j.1600-6143.2011.03635.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [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: 01/25/2023]
Abstract
Successful expansion of functional CD4(+) CD25(+) regulatory T cells (T(reg)) ex vivo under good manufacturing practice conditions has made T(reg) -cell therapy in clinical transplant tolerance induction a feasible possibility. In animals, T(reg) cells home to both transplanted tissues and local lymph nodes and are optimally suppressive if active at both sites. Therefore, they have the opportunity to suppress both naïve and memory CD4(+) CD25(-) T cells (Tresp). Clinical transplantation commonly involves depleting therapy at induction (e.g. anti-CD25), which favors homeostatic expansion of memory T cells. Animal models suggest that T(reg) cells are less suppressive on memory, compared with naïve Tresp that mediate allograft rejection. As a result, in the context of human T(reg) -cell therapy, it is important to define the effectiveness of T(reg) cells in regulating naïve and memory Tresp. Therefore, we compared suppression of peripheral blood naïve and memory Tresp by fresh and ex vivo expanded T(reg) cells using proliferation, cytokine production and activation marker expression (CD154) as readouts. With all readouts, naïve human Tresp were more suppressible by approximately 30% than their memory counterparts. This suggests that T(reg) cells may be more efficacious if administered before or at the time of transplantation and that depleting therapy should be avoided in clinical trials of T(reg) cells.
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Affiliation(s)
- B. Afzali
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
,Corresponding author: Behdad Afzali,
| | - P.J. Mitchell
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - C. Scottà
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - J. Canavan
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - F. C. Edozie
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - H. Fazekasova
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - G. M. Lord
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - S. John
- Department of Immunobiology, King’s College London, London, UK
| | - L. D. Barber
- Department of Hematology, King’s College London, London, UK
| | - M. P. Hernandez-Fuentes
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - R. I. Lechler
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - G. Lombardi
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
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Abstract
The artificial transfer of tissues or cells between genetically diverse individuals elicits an immune response that is adaptive and specific. This response is orchestrated by T lymphocytes that are recognizing, amongst others, major histocompatibility complex (MHC) molecules expressed on the surface of the transferred cells. Three pathways of recognition are described: direct, indirect and semi-direct. The sets of antigens that are recognized in this setting are also discussed, namely, MHC protein products, the MHC class I-related chain (MIC) system, minor histocompatibility antigens and natural killer cell receptor ligands. The end product of the effector responses are hyperacute, acute and chronic rejection. Special circumstances surround the situation of pregnancy and bone marrow transplantation because in the latter, the transferred cells are the ones originating the immune response, not the host. As the understanding of these processes improves, the ability to generate clinically viable immunotherapies will increase.
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Affiliation(s)
- B Afzali
- Department of Nephrology and Transplantation, King's College London, Guy's Hospital Campus, London, UK
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Diaz D, Prieto A, Barcenilla H, Monserrat J, Prieto P, Sánchez MA, Reyes E, Hernandez-Fuentes MP, de la Hera A, Orfao A, Alvarez-Mon M. Loss of lineage antigens is a common feature of apoptotic lymphocytes. J Leukoc Biol 2004; 76:609-15. [PMID: 15178701 DOI: 10.1189/jlb.0304171] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [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: 11/24/2022] Open
Abstract
The analysis of apoptosis in cell populations involves the detection of their specific lineage antigen (LAg) expression. This experimental approach relies on their assumed constant expression, but it is unclear whether such expression is actually maintained during cell death. We examined whether the loss of LAgs is a common feature of apoptotic lymphocytes and whether some might completely lose their LAgs. The changes in the expression of CD3, CD5, CD8, CD4, CD28, CD56, and CD19 were monitored in highly purified lymphocyte populations obtained by negative selection in a fluorescence-activated cell sorter. These were cultured for 24 h with or without phytohemagglutinin or staurosporin. For each LAg-positive subset studied, apoptosis was consistently more common among cells showing partial or total loss of LAg expression compared with cells maintaining their initial LAg levels. The kinetics of expression loss was rapid for CD8, CD56, and CD28, and more than 80% of initial expression was lost in the early stages of apoptosis but was slower for CD3, CD5, and CD4. For CD3 and CD5, expression was dependent on the apoptotic stimulus used. It is interesting that loss of antigen expression was independent of cell size. This phenomenon was also found in nonmanipulated, highly pure CD19 B lymphocytes of peripheral blood mononuclear cells from B chronic lymphocytic leukemia patients. Loss of LAg expression appeared to be a common feature of apoptotic lymphocytes under all the conditions assayed. The different kinetic patterns of LAg loss suggest apoptotic cells might actively regulate this process.
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Affiliation(s)
- D Diaz
- Associated Unit, Department of Medicine, University of Alcalá, Carretera Madrid, Spain
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7
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Hernandez-Fuentes MP, Stevenson S, Barroso-Herrera O, Lechler RI. Establishing the optimal method to estimate the frequencies of alloreactive CD4+ T cells. Transplant Proc 2002; 34:2855-7. [PMID: 12431634 DOI: 10.1016/s0041-1345(02)03535-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Baker RJ, Hernandez-Fuentes MP, Brookes PA, Chaudhry AN, Cook HT, Lechler RI. Loss of direct and maintenance of indirect alloresponses in renal allograft recipients: implications for the pathogenesis of chronic allograft nephropathy. J Immunol 2001; 167:7199-206. [PMID: 11739543 DOI: 10.4049/jimmunol.167.12.7199] [Citation(s) in RCA: 170] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Chronic allograft nephropathy (CAN) is the principal cause of late renal allograft failure. This complex process is multifactorial in origin, and there is good evidence for immune-mediated effects. The immune contribution to this process is directed by CD4(+) T cells, which can be activated by either direct or indirect pathways of allorecognition. For the first time, these pathways have been simultaneously compared in a cohort of 22 longstanding renal allograft recipients (13 with good function and nine with CAN). CD4(+) T cells from all patients reveal donor-specific hyporesponsiveness by the direct pathway according to proliferation or the secretion of the cytokines IL-2, IL-5, and IFN-gamma. Donor-specific cytotoxic T cell responses were also attenuated. In contrast, the frequencies of indirectly alloreactive cells were maintained, patients with CAN having significantly higher frequencies of CD4(+) T cells indirectly activated by allogeneic peptides when compared with controls with good allograft function. An extensive search for alloantibodies has revealed significant titers in only a minority of patients, both with and without CAN. In summary, this study demonstrates widespread donor-specific hyporesponsiveness in directly activated CD4(+) T cells derived from longstanding recipients of renal allografts, whether they have CAN or not. However, patients with CAN have significantly higher frequencies of CD4(+) T cells activated by donor Ags in an indirect manner, a phenomenon resembling split tolerance. These findings provide an insight into the pathogenesis of CAN and also have implications for the development of a clinical tolerance assay.
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Affiliation(s)
- R J Baker
- Department of Immunology, Faculty of Medicine, Imperial College, Hammersmith Hospital, London, United Kingdom
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9
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Ng WF, Hernandez-Fuentes MP, Lombardi G. Predictive value of in vitro assessment of direct alloresponses in transplant recipients? Transplantation 2001; 72:772-3. [PMID: 11571434 DOI: 10.1097/00007890-200109150-00004] [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] [Indexed: 11/25/2022]
Affiliation(s)
- W F Ng
- Department of Immunology, Imperial College School of Medicine, Hammersmith Hospital, London, UK
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10
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Baker RJ, Hernandez-Fuentes MP, Brookes PA, Chaudhry AN, Lechler RI. The role of the allograft in the induction of donor-specific T cell hyporesponsiveness. Transplantation 2001; 72:480-5. [PMID: 11502979 DOI: 10.1097/00007890-200108150-00020] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [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: 11/25/2022]
Abstract
BACKGROUND With adequate immunosuppression the majority of renal allografts are accepted, despite the exceptional vigour of the T cell alloimmune response. Previous work from this laboratory has demonstrated that this is accompanied by significant reductions in the precursor frequencies of anti-donor T cells. We have also shown that parenchymal cells are tolerogenic in vitro. We propose that the reduction in T cell frequencies may be due to the interaction between circulating T cells and potentially tolerogenic graft parenchymal cells. Primed/memory T cells (CD45RO+) are the only subset capable of reaching the allograft and therefore we would predict that T cell hyporesponsiveness would develop predominantly in the CD45RO+ subset due to their trafficking properties. METHODS Frequencies of IL-2 secreting CD45RA+ and CD45RO+ CD4+ T cells in response to donor and third party stimulator cells were estimated in a series of renal transplant recipients, both before and after transplantation. RESULTS There were highly significant reductions in the frequencies of donor-specific CD4+CD45RO+ T cells, when adjusted to control for the generalised effects of immunosuppression. There were no significant alterations in the frequencies of donor-specific CD4+CD45RA+ T cells. CONCLUSIONS In renal transplant recipients, donor-specific CD4+ T cell hyporesponsiveness occurs predominantly in CD4+ CD45RO+ T cells which is the subset capable of trafficking through the graft.
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Affiliation(s)
- R J Baker
- Department of Immunology, Imperial College School of Medicine, Hammersmith Hospital, Du Cane Road, London, W12 0NN, UK
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Hernandez-Fuentes MP, Baker RJ, Lechler RI. The alloresponse. Rev Immunogenet 2001; 1:282-96. [PMID: 11256420] [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] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
The alloresponse can be divided into two components. The first of these is allorecognition, which refers to the recognition of antigens, expressed on the surface of cells of non-self origin, by the host's lymphocytes. The second part is the immune effector mechanisms generated by this recognition process. The molecules recognised have been termed histocompatibility antigens and fall into two categories. The strongest responses are provoked by allogeneic major histocompatibility complex (MHC) antigens. T cells recognise these antigens either directly or after being processed like conventional antigens by antigen-presenting cells, in what has been termed indirect presentation. In the context of MHC identity, responses are observed against the second category of antigens, namely minor histocompatibility antigens (mHAgs). Although weaker, these responses are of clinical importance, particularly in bone marrow transplant recipients. CD4+ T cells play a central role in orchestrating the immune response to alloantigens. They secrete cytokines to attract effector cells, such as macrophages and CD8+ T cells, into the graft and are able to interact with B cells that will secrete highly specific alloreactive antibodies. In clinical terms, the result of the immune response to transplanted allografts can be classified as hyperacute rejection, acute and chronic rejection. The immunological effector mechanisms involved in each of these processes are discussed.
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Affiliation(s)
- M P Hernandez-Fuentes
- Department of Immunology, Imperial College of Science, Technology and Medicine, Hammersmith Hospital, London, UK
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Baker RJ, Hernandez-Fuentes MP, Brookes PA, Chaudhry AN, Lechler R. Comparison of the direct and indirect pathways of allorecognition in chronic allograft failure. Transplant Proc 2001; 33:449. [PMID: 11266904 DOI: 10.1016/s0041-1345(00)02088-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- R J Baker
- Department of Immunology, Imperial College School of Medicine, Hammersmith Hospital, Du Cane Road, London, United Kingdom
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Prieto A, Reyes E, Diaz D, Hernandez-Fuentes MP, Monserrat J, Perucha E, Muñoz L, Vangioni R, de La Hera A, Orfao A, Alvarez-Mon M. A new method for the simultaneous analysis of growth and death of immunophenotypically defined cells in culture. Cytometry 2000; 39:56-66. [PMID: 10655563 DOI: 10.1002/(sici)1097-0320(20000101)39:1<56::aid-cyto8>3.0.co;2-v] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Internal standards have been used in flow cytometry methods to enumerate lymphoid subsets and hemopoietic progenitor cells ex vivo. However, the currently available methods cannot be readily applied to the analysis of cultured cells because of the frequent occurrence of cell death during in vitro assays. METHODS This paper reports a new method for the enumeration of both viable and nonviable cells in culture. Cells were counted with the aid of an internal reference standard of microbeads, and live versus dead cell discrimination was performed using 7-amino-actinomycin D which allows the double staining of surface antigens. RESULTS The method is more precise, accurate and sensitive than either conventional light microscopy-based or automated cell counting. Additionally, it may be used to accurately measure the number of apoptotic cells in a culture. RESULTS Through the enumeration of surviving cells it is demonstrated that, when applied to the study of mitogen-activated T lymphocytes, current flow cytometry techniques (which do not use internal standards) for the study of the viability and apoptosis overestimate the fraction of viable cells and underestimate both the fraction of dead and apoptotic cells. CONCLUSIONS The new method overcomes these limitations and is of use in the in vitro study of cell growth and apoptosis.
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Affiliation(s)
- A Prieto
- Department of Medicine, University of Alcalá, Alcalá de Henares, Madrid, Spain
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