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Zhang LF, Zhang Y, Shui RH, Lu HF, Jiang WH, Cai X, Li XQ, Yu BH. MNDA expression and its value in differential diagnosis of B-cell non-Hodgkin lymphomas: a comprehensive analysis of a large series of 1293 cases. Diagn Pathol 2024; 19:60. [PMID: 38627702 PMCID: PMC11020995 DOI: 10.1186/s13000-024-01481-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 12/10/2023] [Accepted: 04/01/2024] [Indexed: 04/19/2024] Open
Abstract
AIMS MNDA (myeloid nuclear differentiation antigen) has been considered as a potential diagnostic marker for marginal zone lymphoma (MZL), but its utility in distinguishing MZL from other B-cell non-Hodgkin lymphomas (B-NHLs) and its clinicopathologic relevance in diffuse large B-cell lymphoma (DLBCL) are ambiguous. We comprehensively investigated MNDA expression in a large series of B-NHLs and evaluated its diagnostic value. METHODS MNDA expression in a cohort of 1293 cases of B-NHLs and 338 cases of reactive lymphoid hyperplasia (RLH) was determined using immunohistochemistry and compared among different types of B-NHL. The clinicopathologic relevance of MNDA in DLBCL was investigated. RESULTS MNDA was highly expressed in MZLs (437/663, 65.9%), compared with the confined staining in marginal zone B-cells in RLH; whereas neoplastic cells with plasmacytic differentiation lost MNDA expression. MNDA expression was significantly higher in mantle cell lymphoma (MCL, 79.6%, p = 0.006), whereas lower in chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL, 44.8%, p = 0.001) and lymphoplasmacytic lymphoma (LPL, 25%, p = 0.016), and dramatically lower in follicular lymphoma (FL, 5.2%, p < 0.001), compared with MZL. 29.6% (63/213) of DLBCLs were positive for MNDA. The cases in non-GCB group exhibited a higher rate of MNDA positivity (39.8%) compared to those in GCB group (16.3%) (p < 0.001), and MNDA staining was more frequently observed in DLBCLs with BCL2/MYC double-expression (50%) than those without BCL2/MYC double-expression (24.8%) (p = 0.001). Furthermore, there was a significant correlation between MNDA and CD5 expression in DLBCL (p = 0.036). CONCLUSIONS MNDA was highly expressed in MZL with a potential utility in differential diagnosis between MZL and RLH as well as FL, whereas its value in distinguishing MZL from MCL, CLL/SLL is limited. In addition, MNDA expression in DLBCL was more frequently seen in the non-GCB group and the BCL2/MYC double-expression group, and demonstrated a correlation with CD5, which deserves further investigation. The clinical relevance of MNDA and its correlation with the prognosis of these lymphomas also warrant to be fully elucidated.
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Affiliation(s)
- Li-Fen Zhang
- Department of Pathology, Fudan University Shanghai Cancer Center, Dong-an Road 270, Xuhui District, Shanghai, CN, 200032, China
| | - Yan Zhang
- Department of Pathology, Fudan University Shanghai Cancer Center, Dong-an Road 270, Xuhui District, Shanghai, CN, 200032, China
- Shanghai Medical College, Department of Oncology, Fudan University, Shanghai, CN, 200032, China
| | - Rou-Hong Shui
- Department of Pathology, Fudan University Shanghai Cancer Center, Dong-an Road 270, Xuhui District, Shanghai, CN, 200032, China
- Shanghai Medical College, Department of Oncology, Fudan University, Shanghai, CN, 200032, China
| | - Hong-Fen Lu
- Department of Pathology, Fudan University Shanghai Cancer Center, Dong-an Road 270, Xuhui District, Shanghai, CN, 200032, China
- Shanghai Medical College, Department of Oncology, Fudan University, Shanghai, CN, 200032, China
| | - Wen-Hua Jiang
- Department of Pathology, Fudan University Shanghai Cancer Center, Dong-an Road 270, Xuhui District, Shanghai, CN, 200032, China
| | - Xu Cai
- Department of Pathology, Fudan University Shanghai Cancer Center, Dong-an Road 270, Xuhui District, Shanghai, CN, 200032, China
| | - Xiao-Qiu Li
- Department of Pathology, Fudan University Shanghai Cancer Center, Dong-an Road 270, Xuhui District, Shanghai, CN, 200032, China
- Shanghai Medical College, Department of Oncology, Fudan University, Shanghai, CN, 200032, China
| | - Bao-Hua Yu
- Department of Pathology, Fudan University Shanghai Cancer Center, Dong-an Road 270, Xuhui District, Shanghai, CN, 200032, China.
- Shanghai Medical College, Department of Oncology, Fudan University, Shanghai, CN, 200032, China.
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Bottardi S, Layne T, Ramòn AC, Quansah N, Wurtele H, Affar EB, Milot E. MNDA, a PYHIN factor involved in transcriptional regulation and apoptosis control in leukocytes. Front Immunol 2024; 15:1395035. [PMID: 38680493 PMCID: PMC11045911 DOI: 10.3389/fimmu.2024.1395035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2024] [Accepted: 04/02/2024] [Indexed: 05/01/2024] Open
Abstract
Inflammation control is critical during the innate immune response. Such response is triggered by the detection of molecules originating from pathogens or damaged host cells by pattern-recognition receptors (PRRs). PRRs subsequently initiate intra-cellular signalling through different pathways, resulting in i) the production of inflammatory cytokines, including type I interferon (IFN), and ii) the initiation of a cascade of events that promote both immediate host responses as well as adaptive immune responses. All human PYRIN and HIN-200 domains (PYHIN) protein family members were initially proposed to be PRRs, although this view has been challenged by reports that revealed their impact on other cellular mechanisms. Of relevance here, the human PYHIN factor myeloid nuclear differentiation antigen (MNDA) has recently been shown to directly control the transcription of genes encoding factors that regulate programmed cell death and inflammation. While MNDA is mainly found in the nucleus of leukocytes of both myeloid (neutrophils and monocytes) and lymphoid (B-cell) origin, its subcellular localization has been shown to be modulated in response to genotoxic agents that induce apoptosis and by bacterial constituents, mediators of inflammation. Prior studies have noted the importance of MNDA as a marker for certain forms of lymphoma, and as a clinical prognostic factor for hematopoietic diseases characterized by defective regulation of apoptosis. Abnormal expression of MNDA has also been associated with altered levels of cytokines and other inflammatory mediators. Refining our comprehension of the regulatory mechanisms governing the expression of MNDA and other PYHIN proteins, as well as enhancing our definition of their molecular functions, could significantly influence the management and treatment strategies of numerous human diseases. Here, we review the current state of knowledge regarding PYHIN proteins and their role in innate and adaptive immune responses. Emphasis will be placed on the regulation, function, and relevance of MNDA expression in the control of gene transcription and RNA stability during cell death and inflammation.
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Affiliation(s)
- Stefania Bottardi
- Maisonneuve-Rosemont Hospital Research Centre, University of Montreal, Centre Intégré Universitaire de Santé et de Services Sociaux (CIUSSS) de l’Est-de-l’Île de Montreal, Montreal, QC, Canada
| | - Taylorjade Layne
- Maisonneuve-Rosemont Hospital Research Centre, University of Montreal, Centre Intégré Universitaire de Santé et de Services Sociaux (CIUSSS) de l’Est-de-l’Île de Montreal, Montreal, QC, Canada
| | - Ailyn C. Ramòn
- Maisonneuve-Rosemont Hospital Research Centre, University of Montreal, Centre Intégré Universitaire de Santé et de Services Sociaux (CIUSSS) de l’Est-de-l’Île de Montreal, Montreal, QC, Canada
- Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Norreen Quansah
- Maisonneuve-Rosemont Hospital Research Centre, University of Montreal, Centre Intégré Universitaire de Santé et de Services Sociaux (CIUSSS) de l’Est-de-l’Île de Montreal, Montreal, QC, Canada
- Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Hugo Wurtele
- Maisonneuve-Rosemont Hospital Research Centre, University of Montreal, Centre Intégré Universitaire de Santé et de Services Sociaux (CIUSSS) de l’Est-de-l’Île de Montreal, Montreal, QC, Canada
- Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - El Bachir Affar
- Maisonneuve-Rosemont Hospital Research Centre, University of Montreal, Centre Intégré Universitaire de Santé et de Services Sociaux (CIUSSS) de l’Est-de-l’Île de Montreal, Montreal, QC, Canada
- Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Eric Milot
- Maisonneuve-Rosemont Hospital Research Centre, University of Montreal, Centre Intégré Universitaire de Santé et de Services Sociaux (CIUSSS) de l’Est-de-l’Île de Montreal, Montreal, QC, Canada
- Department of Medicine, Université de Montréal, Montréal, QC, Canada
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Ayada Y, Igawa T, Naoi Y, Horikawa K, Tabata T, Tanaka T, Yoshino T. Immunohistochemistry for IRTA1 and MNDA helps differentiate gastric MALT lymphoma from chronic gastritis/reactive lymphocyte hyperplasia. J Clin Exp Hematop 2022; 62:195-201. [PMID: 36436933 PMCID: PMC9898717 DOI: 10.3960/jslrt.22021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
It is difficult to histologically differentiate extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue (MALT lymphoma) from chronic gastritis (CG)/ reactive lymphoid hyperplasia (RLH). To determine whether immunohistochemistry for IRTA1 and MNDA can differentiate gastric MALT lymphoma from CG/RLH, we investigated 81 stomach biopsy specimens [Wotherspoon grade (WG) 1, 11 cases; WG 2, 9 cases; WG 3, 20 cases; WG 4, 31 cases; and WG 5, 10 cases]. According to a previously reported algorithm involving PCR for immunoglobulin heavy (IgH) chain locus rearrangement, all 81 cases were divided into three groups: CG/RLH (55 cases), MALT lymphoma (19 cases) groups, and IgH undetectable group (7 cases). We analyzed the CG/RLH and MALT lymphoma groups. The median percentage of IRTA1-positive cells was 0% (range 0%-90.6%) in the CG/RLH group and 43.5% (range 0%-97.6%) in the MALT lymphoma group (p < 0.0001). The median percentage of MNDA-positive cells was 32.4% (range 0%-97.6%) in the CG/RLH group and 55.1% (range 0%-97.6%) in the MALT lymphoma group (p = 0.0044). These results indicate that immunohistochemistry for IRTA1 and MNDA can help differentiate gastric MALT lymphoma from CG/RLH.
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Affiliation(s)
- Yoshiyuki Ayada
- Department of Pathology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan
| | - Takuro Igawa
- Department of Pathology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan
| | - Yusuke Naoi
- Department of Pathology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan
| | - Kyosuke Horikawa
- Department of Pathology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan
| | - Tetsuya Tabata
- Department of Pathology, National Hospital Organization Okayama Medical Center, Okayama, Japan
| | - Takehiro Tanaka
- Department of Pathology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan
| | - Tadashi Yoshino
- Department of Pathology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan
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Righi S, Novero D, Godio L, Bertuzzi C, Bacci F, Agostinelli C, Sagramoso C, Rossi M, Piccioli M, Gazzola A, Mannu C, Roncador G, Sabattini E. Myeloid Nuclear Differentiation Antigen ( MNDA): an aid in differentiating lymphoplasmayctic lymphoma and splenic marginal zone lymphoma in bone marrow biopsies at presentation. Hum Pathol 2022; 124:67-75. [PMID: 35339566 DOI: 10.1016/j.humpath.2022.03.008] [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] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 03/16/2022] [Accepted: 03/16/2022] [Indexed: 11/04/2022]
Abstract
The differential diagnosis between lymphoplasmacytic lymphoma (LPL) and marginal zone B-cell lymphoma, particularly splenic type (SMZL) can be challenging on onset bone marrow biopsy (BMB) since morphology and phenotype are not specific and clinical features can overlap or be mildly developed at diagnosis. The LPL-specific L265P mutation in the MYD88 gene is not available in all laboratories and genetic aberrancies identified in SMZL (del7q, mutations of NOTCH2 and KLF2) are seldom searched in routine practice. The study aim is to investigate the potential role of MNDA expression in this specific differential diagnosis. We report MNDA reactivity in 559 small B-cell lymphoma (SBCL) patients including bone marrow biopsies from 90 LPL and 91 SMZL. MYD88 p.Leu265Pro mutation status was assessed and confirmed as positive in 24 of 90 LPL cases, which served as the test set. MNDA staining was negative in 23/24 LPL cases in the test set (96%). In the 157 remaining cases (66 LPL, 91 SMZL), which served as validation set, the MYD88 p.Leu265Pro mutation was unavailable and MNDA was more frequently expressed in SMZL (p<0.00001). In addition, immunohistochemical features more consistent with SMZL (i.e. presence of CD23+ follicular dendritic cell meshworks, polytypic plasma cells, DBA44 reactivity) were more often present in MNDA positive cases (statistically significant for 2 such parameters). On the widest case-series so far published focusing on LPL and SMZL immunohistochemical diagnosis at onset on BMB, we demonstrated that MNDA expression significantly support the diagnosis of SMZL. This observation may be of particular help in cases where the MYD88 p.Leu265Pro mutational status and/or SMZL-related genetic aberrations are unavailable.
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Affiliation(s)
- Simona Righi
- Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy, Via Massarenti 11, 40138 Bologna, Italy.
| | - Domenico Novero
- Unit of Surgical Pathology - University Hospital of Turin, Città Della Salute - Ospedale Le Molinette, Turin, Italy, Corso Bramante 88, 10126, Turin, Italy.
| | - Laura Godio
- Unit of Surgical Pathology - University Hospital of Turin, Città Della Salute - Ospedale Le Molinette, Turin, Italy, Corso Bramante 88, 10126, Turin, Italy.
| | - Clara Bertuzzi
- Haematopathology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.Via Massarenti 9 - 40138 Bologna, Italy.
| | - Francesco Bacci
- Haematopathology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.Via Massarenti 9 - 40138 Bologna, Italy.
| | - Claudio Agostinelli
- Haematopathology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.Via Massarenti 9 - 40138 Bologna, Italy; Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy, Via Massarenti 11, 40138 Bologna, Italy.
| | - Carlo Sagramoso
- Haematopathology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.Via Massarenti 9 - 40138 Bologna, Italy.
| | - Maura Rossi
- Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy, Via Massarenti 11, 40138 Bologna, Italy.
| | - Milena Piccioli
- Haematopathology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.Via Massarenti 9 - 40138 Bologna, Italy.
| | - Anna Gazzola
- Haematopathology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.Via Massarenti 9 - 40138 Bologna, Italy.
| | - Claudia Mannu
- Haematopathology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.Via Massarenti 9 - 40138 Bologna, Italy.
| | - Giovanna Roncador
- Biotechnology Program, Spanish National Cancer Research Centre, Madrid, Spain, C/ Melchor Fernández Almagro 3, 28029 Madrid, Spain.
| | - Elena Sabattini
- Haematopathology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.Via Massarenti 9 - 40138 Bologna, Italy.
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Kıvrak H, Yüksel S, Ateş C, Merter M, Kaygusuz G, Özcan M, Kuzu I. The Relevance of Additional Immunohistochemical Markers on the Differential Diagnosis of Small B-Cell Lymphomas: A Case-control Study. Turk J Haematol 2021; 39:178-187. [PMID: 34619856 PMCID: PMC9421338 DOI: 10.4274/tjh.galenos.2021.2021.0349] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Objective: Clinical and pathological differential diagnosis of small B-cell lymphomas (SBCLs) is still controversial and may be difficult due to their overlapping morphology, phenotype, and differentiation to plasma cells. We aimed to examine the expression of the immune receptor translocation-associated protein 1 (IRTA1), myeloid cell nuclear differentiation antigen (MNDA), lymphoid enhancer-binding factor-1 (LEF1), and stathmin 1 (STMN1) markers in SBCL cases involving different sites that may have plasma cell differentiation. Materials and Methods: We studied 154 tissue samples with lymphoma involvement from 116 patients and evaluated the staining distribution of the markers. Expressions were evaluated in 21 chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL), 7 follicular lymphoma (FL), 14 nodal marginal zone lymphoma, 17 extranodal marginal zone lymphoma, 55 splenic marginal zone lymphoma, 22 marginal zone lymphoma-not otherwise specified, and 18 lymphoplasmacytic lymphoma/Waldenström macroglobulinemia cases by immunohistochemistry. Results: The results confirmed that LEF1 was the most sensitive and specific marker for CLL/SLL and STMN1 was the most sensitive and specific marker for FL (p<0.001). MNDA and IRTA1 were useful markers to distinguish marginal zone lymphomas. Conclusion: Our results suggest that LEF1 for CLL/SLL and STMN1 for FL are reliable markers. LEF1, MNDA, STMN1, and IRTA1 are helpful with other routinely used immunohistochemical markers in a diagnostic algorithm considering their limitations.
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Affiliation(s)
- Hale Kıvrak
- Ankara University Faculty of Medicine, Department of Pathology, Ankara, Turkey
| | - Seher Yüksel
- Ankara University Faculty of Medicine, Department of Pathology, Ankara, Turkey
| | - Can Ateş
- Aksaray University Faculty of Medicine, Department of Biostatistics and Medical Informatics, Aksaray, Turkey.,Ankara University Faculty of Medicine, Department of Biostatistics, Ankara, Turkey
| | - Mustafa Merter
- Fırat University Faculty of Medicine, Department of Hematology, Elazığ, Turkey.,Ankara University Faculty of Medicine, Department of Hematology, Ankara, Turkey
| | - Gülşah Kaygusuz
- Ankara University Faculty of Medicine, Department of Pathology, Ankara, Turkey
| | - Muhit Özcan
- Ankara University Faculty of Medicine, Department of Hematology, Ankara, Turkey
| | - Işınsu Kuzu
- Ankara University Faculty of Medicine, Department of Pathology, Ankara, Turkey
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Carlsen ED, Bhavsar S, Cook JR, Swerdlow SH. IRTA1 positivity helps identify a MALT-lymphoma-like subset of primary cutaneous marginal zone lymphomas, largely but not exclusively defined by IgM expression. J Cutan Pathol 2021; 49:55-60. [PMID: 34309899 DOI: 10.1111/cup.14111] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 05/26/2021] [Revised: 06/28/2021] [Accepted: 07/12/2021] [Indexed: 11/27/2022]
Abstract
BACKGROUND It has been proposed that primary cutaneous marginal zone lymphomas (PCMZLs) include a MALT-lymphoma-like IgM+ subset and a class-switched subset, which is unlike most other MALT lymphomas. Whether expression of the MALT lymphoma-associated biomarkers IRTA1 and MNDA would support this concept and whether they might help explain why some patients have both subtypes is uncertain. METHODS Twenty-five PCMZLs from 21 patients were stained for IRTA1 by in situ hybridization and for MNDA by immunohistochemistry. In two patients, polymerase chain reaction (PCR)-based B-cell clonality studies were performed on biopsy specimens of metachronous lesions, which expressed different heavy chains. All results were correlated with the histopathologic and clinical findings. RESULTS Five of six IgM+ PCMZLs were IRTA1+ vs three of 18 evaluable class-switched cases (P = 0.0069). Two of the class-switched IRTA1+ cases were in patients with clonally-related IRTA1+ IgM+ PCMZLs. IRTA1 positivity showed a statistically significant correlation with several MALT-lymphoma-associated histopathologic findings. In contrast, all PCMZL cases showed at least some MNDA expression with no differences between IgM+ and class-switched cases. CONCLUSIONS IRTA1 identifies MALT-lymphoma-like PCMZLs that are largely but not exclusively IgM+. This supports the concept of two PCMZL subsets but suggests their distinction should not be based solely on their heavy chain expression.
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Affiliation(s)
- Eric D Carlsen
- Department of Pathology, UPMC, Pittsburgh, Pennsylvania, USA
| | - Shweta Bhavsar
- Department of Pathology, UPMC, Pittsburgh, Pennsylvania, USA
| | - James R Cook
- Department of Laboratory Medicine, Cleveland Clinic, Cleveland, Ohio, USA
| | - Steven H Swerdlow
- Department of Pathology, University of Pittsburgh School of Medicine and UPMC, Pittsburgh, Pennsylvania, USA
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Milot E, Fotouhi-Ardakani N, Filep JG. Myeloid nuclear differentiation antigen, neutrophil apoptosis and sepsis. Front Immunol 2012; 3:397. [PMID: 23293639 PMCID: PMC3530780 DOI: 10.3389/fimmu.2012.00397] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Accepted: 12/07/2012] [Indexed: 11/23/2022] Open
Abstract
Sepsis and septic shock are characterized by prolonged inflammation and delayed resolution, which are associated with suppression of neutrophil apoptosis. The role of the intrinsic apoptotic pathway and intracellular factors in regulation of neutrophil apoptosis remain incompletely understood. We previously reported that the nuclear factor MNDA (myeloid nuclear differentiation antigen) is fundamental to execution of the constitutive neutrophil death program. During neutrophil apoptosis MNDA is cleaved by caspases and relocated to the cytoplasm. However, when challenged with known mediators of sepsis, human neutrophils of healthy donors or neutrophils from patients with sepsis exhibited impaired MNDA relocation/cleavage parallel with myeloid cell leukemia-1 (MCL-1) accumulation and suppression of apoptosis. MNDA knockdown in a model cell line indicated that upon induction of apoptosis, MNDA promotes proteasomal degradation of MCL-1, thereby aggravating mitochondrial dysfunction. Thus, MNDA is central to a novel nucleus-mitochondrion circuit that promotes progression of apoptosis. Disruption of this circuit contributes to neutrophil longevity, thereby identifying MNDA as a potential therapeutic target in sepsis and other inflammatory pathologies.
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Affiliation(s)
- Eric Milot
- Department of Medicine, Maisonneuve-Rosemont Hospital Research Center, University of Montréal Montréal, QC, Canada
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