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5.
Semin Hematol ; 60(2): 90-96, 2023 03.
Artigo em Inglês | MEDLINE | ID: mdl-37099028

RESUMO

Apart from the MYD88L265P mutation, extensive information exists on the molecular mechanisms in Waldenström's Macroglobulinemia and its potential utility in the diagnosis and treatment tailoring. However, no consensus recommendations are yet available. Consensus Panel 3 (CP3) of the 11th International Workshop on Waldenström's Macroglobulinemia (IWWM-11) was tasked with reviewing the current molecular necessities and best way to access the minimum data required for a correct diagnosis and monitoring. Key recommendations from IWWM-11 CP3 included: (1) molecular studies are warranted for patients in whom therapy is going to be started; such studies should also be done in those whose bone marrow (BM) material is sampled based on clinical issues; (2) molecular studies considered essential for these situations are those that clarify the status of 6q and 17p chromosomes, and MYD88, CXCR4, and TP53 genes. These tests in other situations, and/or other tests, are considered optional; (3) independently of the use of more sensitive and/or specific techniques, the minimum requirements are allele specific polymerase chain reaction for MYD88L265P and CXCR4S338X using whole BM, and fluorescence in situ hybridization for 6q and 17p and sequencing for CXCR4 and TP53 using CD19+ enriched BM; (4) these requirements refer to all patients; therefore, sample should be sent to specialized centers.


Assuntos
Macroglobulinemia de Waldenstrom , Humanos , Macroglobulinemia de Waldenstrom/diagnóstico , Macroglobulinemia de Waldenstrom/genética , Macroglobulinemia de Waldenstrom/terapia , Fator 88 de Diferenciação Mieloide/genética , Hibridização in Situ Fluorescente , Mutação
6.
Blood ; 141(21): 2615-2628, 2023 05 25.
Artigo em Inglês | MEDLINE | ID: mdl-36735903

RESUMO

Recent investigations have improved our understanding of the molecular aberrations supporting Waldenström macroglobulinemia (WM) biology; however, whether the immune microenvironment contributes to WM pathogenesis remains unanswered. First, we showed how a transgenic murine model of human-like lymphoplasmacytic lymphoma/WM exhibits an increased number of regulatory T cells (Tregs) relative to control mice. These findings were translated into the WM clinical setting, in which the transcriptomic profiling of Tregs derived from patients with WM unveiled a peculiar WM-devoted messenger RNA signature, with significant enrichment for genes related to nuclear factor κB-mediated tumor necrosis factor α signaling, MAPK, and PI3K/AKT, which was paralleled by a different Treg functional phenotype. We demonstrated significantly higher Treg induction, expansion, and proliferation triggered by WM cells, compared with their normal cellular counterpart; with a more profound effect within the context of CXCR4C1013G-mutated WM cells. By investigating the B-cell-to-T-cell cross talk at single-cell level, we identified the CD40/CD40-ligand as a potentially relevant axis that supports WM cell-Tregs interaction. Our findings demonstrate the existence of a Treg-mediated immunosuppressive phenotype in WM, which can be therapeutically reversed by blocking the CD40L/CD40 axis to inhibit WM cell growth.


Assuntos
Linfoma de Células B , Macroglobulinemia de Waldenstrom , Humanos , Animais , Camundongos , Macroglobulinemia de Waldenstrom/patologia , Ligante de CD40/genética , Fosfatidilinositol 3-Quinases , Ligantes , Transdução de Sinais , Linfoma de Células B/complicações , Microambiente Tumoral
7.
Leukemia ; 37(2): 388-395, 2023 02.
Artigo em Inglês | MEDLINE | ID: mdl-36435884

RESUMO

The diagnosis of Waldenström's macroglobulinemia (WM), an IgM-associated lymphoplasmacytic lymphoma, can be challenging due to the different forms of disease presentation. Furthermore, in recent years, WM has witnessed remarkable progress on the diagnostic front, as well as a deeper understanding of the disease biology, which has affected clinical practice. This, together with the increasing variety of tools and techniques available, makes it necessary to have a practical guidance for clinicians to perform the initial evaluation of patients with WM. In this paper, we present the consensus recommendations and laboratory requirements for the diagnosis of WM developed by the European Consortium of Waldenström's Macroglobulinemia (ECWM), for both clinical practice as well as the research/academical setting. We provide the procedures for multiparametric flow cytometry, fluorescence in situ hybridization and molecular tests, and with this offer guidance for a standardized diagnostic work-up and methodological workflow of patients with IgM monoclonal gammopathy of uncertain significance, asymptomatic and symptomatic WM.


Assuntos
Macroglobulinemia de Waldenstrom , Humanos , Macroglobulinemia de Waldenstrom/diagnóstico , Hibridização in Situ Fluorescente , Imunoglobulina M
8.
Cancers (Basel) ; 14(21)2022 Oct 31.
Artigo em Inglês | MEDLINE | ID: mdl-36358796

RESUMO

Within the context of precision medicine, the scientific community is giving particular attention to early diagnosis and intervention, guided by non-invasive methodologies. Liquid biopsy (LBx) is a recent laboratory approach consisting of a non-invasive blood draw, which allows the detection of information about potential prognostic factors, or markers to be used for diagnostic purposes; it might also allow the clinician to establish a treatment regimen and predict a patient's response. Since the discovery of circulating tumor cells (CTCs) in the nineteenth century, the possibility of integrating LBx into clinical practice has been explored, primarily because of its safeness and easy execution: indeed, compared to solid biopsy, sampling-related risks are less of a concern, and the quickness and repeatability of the process could help confirm a prompt diagnosis or to further corroborate the existence of a metastatic spreading of the disease. LBx's usefulness has been consolidated in a narrow range of oncological settings, first of all, non-small cell lung carcinoma (NSCLC), and it is now gradually being assessed also in lymphoproliferative diseases, such as acute lymphocytic leukemia (ALL), B-cell lymphomas, and multiple myeloma. The present review aims to summarize LBx's overall characteristics (such as its advantages and flaws, collection and analysis methodologies, indications, and targets of the test), and to highlight the applications of this technique within the specific field of B-cell malignancies. The perspectives on how such a simple and convenient technique could improve hemato-oncological clinical practice are broadly encouraging, yet far from a complete integration in routine clinical settings.

9.
Exp Hematol Oncol ; 11(1): 54, 2022 Sep 12.
Artigo em Inglês | MEDLINE | ID: mdl-36096954

RESUMO

Activating G protein-coupled estrogen receptor 1 (GPER1) is an attractive therapeutic strategy for treating a variety of human diseases including cancer. Here, we show that GPER1 is significantly upregulated in tumor cells from different cohorts of Waldenström Macroglobulinemia (WM) patients compared to normal B cells. Using the clinically applicable GPER1-selective small-molecule agonist G-1 (also named Tespria), we found that pharmacological activation of GPER1 leads to G2/M cell cycle arrest and apoptosis both in vitro and in vivo in animal models, even in the context of the protective bone marrow milieu. Activation of GPER1 triggered the TP53 pathway, which remains actionable during WM progression. Thus, this study identifies a novel therapeutic target in WM and paves the way for the clinical development of the GPER1 agonist G-1.

10.
Ann Hematol ; 101(6): 1227-1237, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35380239

RESUMO

Therapy-related myeloid neoplasm (t-MN) is a threatening complication of autologous stem cell transplantation (ASCT). Detecting clonal hematopoiesis (CH) mutations in cryopreserved cells before ASCT has been associated with a higher risk of t-MN, but the evolution of molecular abnormalities from pre-ASCT to t-MN, within the same patient, remains to be elucidated. We evaluated the mutational profile of 19 lymphoma/myeloma patients, at both pre-ASCT and t-MN diagnosis, using a targeted NGS approach; 26 non-developing t-MN control patients were also studied pre-ASCT. At ASCT, we found a higher frequency of CH in patients developing t-MN (58%) than in those who did not (23%) (P = 0.029); mutations in epigenetic (DNMT3A, TET2, and ASXL1) and DNA repair genes (PPM1D, RAD21, TP53, and STAG2) were the most represented. At t-MN, CH increased to 82% of patients. Cumulative mutational burden and variant allele frequency (VAF) also increased at t-MN. CH clones detected at ASCT were found at t-MN in eight out of 16 patients, mainly with stable VAF. Among the new driver mutations appeared at t-MN, TP53 increased from one to 13 mutations, in nine patients; being associated with complex karyotype. Mutations in transcription factor (RUNX1, CEBPA) and intracellular signaling genes (FLT3, RAS genes) also increased from three to 17 mutations in eight patients, presenting with a normal karyotype. Overall, we found that preexisting CH at ASCT rarely causes t-MN directly, but may rather facilitate the appearance of new mutations, especially those involving TP53, RUNX1, and RAS, that can drive the evolution to t-MN of at least two distinct types.


Assuntos
Transplante de Células-Tronco Hematopoéticas , Transtornos Mieloproliferativos , Segunda Neoplasia Primária , Hematopoiese Clonal/genética , Subunidade alfa 2 de Fator de Ligação ao Core/genética , Hematopoese/genética , Transplante de Células-Tronco Hematopoéticas/efeitos adversos , Humanos , Mutação , Transtornos Mieloproliferativos/complicações , Transtornos Mieloproliferativos/genética , Transtornos Mieloproliferativos/terapia , Segunda Neoplasia Primária/genética , Transplante Autólogo/efeitos adversos
12.
Sci Adv ; 8(3): eabl4644, 2022 01 21.
Artigo em Inglês | MEDLINE | ID: mdl-35044826

RESUMO

Normal cell counterparts of solid and myeloid tumors accumulate mutations years before disease onset; whether this occurs in B lymphocytes before lymphoma remains uncertain. We sequenced multiple stages of the B lineage in elderly individuals and patients with lymphoplasmacytic lymphoma, a singular disease for studying lymphomagenesis because of the high prevalence of mutated MYD88. We observed similar accumulation of random mutations in B lineages from both cohorts and unexpectedly found MYD88L265P in normal precursor and mature B lymphocytes from patients with lymphoma. We uncovered genetic and transcriptional pathways driving malignant transformation and leveraged these to model lymphoplasmacytic lymphoma in mice, based on mutated MYD88 in B cell precursors and BCL2 overexpression. Thus, MYD88L265P is a preneoplastic event, which challenges the current understanding of lymphomagenesis and may have implications for early detection of B cell lymphomas.


Assuntos
Linfoma de Células B , Linfoma , Macroglobulinemia de Waldenstrom , Idoso , Animais , Humanos , Linfoma de Células B/metabolismo , Camundongos , Mutação , Fator 88 de Diferenciação Mieloide/genética , Fator 88 de Diferenciação Mieloide/metabolismo , Macroglobulinemia de Waldenstrom/diagnóstico , Macroglobulinemia de Waldenstrom/genética , Macroglobulinemia de Waldenstrom/patologia
13.
Cancers (Basel) ; 13(15)2021 Jul 21.
Artigo em Inglês | MEDLINE | ID: mdl-34359551

RESUMO

Multiple myeloma (MM) is a hematological malignancy characterised by proliferation of clonal plasma cells (PCs) within the bone marrow (BM). Myelomagenesis is a multi-step process which goes from an asymptomatic phase, defined as monoclonal gammopathy of undetermined significance (MGUS), to a smouldering myeloma (SMM) stage, to a final active MM disease, characterised by hypercalcemia, renal failure, bone lesions anemia, and higher risk of infections. Overall, microRNAs (miRNAs) have shown to significantly impact on MM tumorigenesis, as a result of miRNA-dependent modulation of genes involved in pathways known to be crucial for MM pathogenesis and disease progression. We aim to revise the literature related to the role of miRNAs as potential diagnostic and prognostic biomarkers, thus highlighting their key role as novel players within the field of MM and related premalignant conditions.

14.
Blood ; 138(17): 1535-1539, 2021 10 28.
Artigo em Inglês | MEDLINE | ID: mdl-34289017

RESUMO

MYD88 and CXCR4 mutations are common in Waldenström macroglobulinemia (WM). Mutated CXCR4 (CXCR4Mut) impacts BTK-inhibitor response. We conducted a phase 1 trial of the CXCR4-antagonist ulocuplumab with ibrutinib in this first-ever study to target CXCR4Mut in WM. Ibrutinib was initiated at 420 mg/d with cycle 1 and continued until intolerance or progression; ulocuplumab was given cycles 1 to 6, with a 3 + 3 dose-escalation design. Each cycle was 4 weeks. Thirteen symptomatic patients, of whom 9 were treatment-naive patients were enrolled. Twelve were evaluable for response. At best response, their median serum immunoglobulin M declined from 5574 to 1114 mg/dL; bone marrow disease decreased from 65% to 10%, and hemoglobin increased from 10.1 to 14.2 g/dL (P < .001). The major and VGPR response rates were 100% and 33%, respectively, with VGPRs observed at lower ulocuplumab dose cohorts. Median times to minor and major responses were 0.9 and 1.2 months, respectively. With a median follow-up of 22.4 months, the estimated 2-year progression-free survival was 90%. The most frequent recurring grade ≥2 adverse events included reversible thrombocytopenia, rash, and skin infections. Ulocuplumab dose-escalation did not impact adverse events. The study demonstrates the feasibility of combining a CXCR4-antagonist with ibrutinib and provides support for the development of CXCR4-antagonists for CXCR4Mut WM. This trial was registered at www.clinicaltrials.gov as #NCT03225716.


Assuntos
Adenina/análogos & derivados , Anticorpos Monoclonais Humanizados/uso terapêutico , Antineoplásicos/uso terapêutico , Piperidinas/uso terapêutico , Inibidores de Proteínas Quinases/uso terapêutico , Receptores CXCR4/genética , Macroglobulinemia de Waldenstrom/tratamento farmacológico , Adenina/efeitos adversos , Adenina/uso terapêutico , Adulto , Idoso , Anticorpos Monoclonais Humanizados/efeitos adversos , Antineoplásicos/efeitos adversos , Humanos , Pessoa de Meia-Idade , Mutação/efeitos dos fármacos , Piperidinas/efeitos adversos , Inibidores de Proteínas Quinases/efeitos adversos , Receptores CXCR4/antagonistas & inibidores , Macroglobulinemia de Waldenstrom/genética
15.
Cancer Med ; 10(17): 5859-5865, 2021 09.
Artigo em Inglês | MEDLINE | ID: mdl-34263564

RESUMO

BACKGROUND: Diffusion-weighted whole-body MRI (DW-MRI) is increasingly used in the management of multiple myeloma (MM) patients, but data regarding the prognostic role of DW-MRI imaging response after treatment are lacking. The Myeloma Response Assessment and Diagnosis System (MY-RADS) imaging recommendations recently proposed the criteria for response assessment category (RAC) with a 5-point scale in order to standardize response assessment after therapy, but this score still needs to be validated. METHODS: We investigated the prognostic role of RAC criteria in 64 newly diagnosed MM patients after autologous stem cell transplantation (ASCT), and we combined the results of MY-RADS with those of minimal residual disease (MRD) assessment by multiparametric flow cytometry (MFC). RESULTS: Superior post-ASCT PFS and OS were observed in patients with complete imaging response (RAC1), with respect to patients with imaging residual disease (RAC≥2): median PFS not reached (NR) versus 26.5 months, p = 0.0047, HR 0.28 (95% CI: 0.12-0.68); 3-year post-ASCT OS 92% versus 69% for RAC1 versus RAC ≥2, respectively, p = 0.047, HR 0.24 (95% CI: 0.06-0.99). Combining MRD and imaging improved prediction of outcome, with double-negative and double-positive features defining groups with excellent and dismal PFS, respectively (PFS NR vs. 10.6 months); p = 0.001, HR 0.07 (95%CI: 0.01-0.36). CONCLUSION: The present study supports the applicability of MY-RADS recommendations after ASCT; RAC criteria were able to independently stratify patients and to better predict their prognosis and the combined use of DW-MRI with MFC allowed a more precise evaluation of MRD.


Assuntos
Citometria de Fluxo/métodos , Transplante de Células-Tronco Hematopoéticas/métodos , Mieloma Múltiplo/complicações , Mieloma Múltiplo/terapia , Neoplasia Residual/diagnóstico , Condicionamento Pré-Transplante/métodos , Transplante Autólogo/métodos , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Neoplasia Residual/patologia , Prognóstico
16.
Blood Cancer Discov ; 2(4): 338-353, 2021 07.
Artigo em Inglês | MEDLINE | ID: mdl-34268498

RESUMO

The bone marrow (BM) microenvironment actively promotes multiple myeloma (MM) pathogenesis and therapies targeting both cancer cells and the niche are highly effective. We were interested in identifying novel signaling pathways supporting MM-BM crosstalk. Mutations in the transmembrane receptor Roundabout 1 (ROBO1) were recently identified in MM patients, however their functional consequences are uncertain. Through protein structure-function studies, we discovered that ROBO1 is necessary for MM adhesion to BM stromal and endothelial cells and ROBO1 knock out (KO) compromises BM homing and engraftment in a disseminated mouse model. ROBO1 KO significantly decreases MM proliferation in vitro and intra- and extramedullary tumor growth, in vivo. Mechanistically, ROBO1 C-terminus is cleaved in a ligand-independent fashion and is sufficient to promote MM proliferation. Viceversa, mutants lacking the cytoplasmic domain, including the human-derived G674* truncation, act dominantly negative. Interactomic and RNA sequencing studies suggest ROBO1 may be involved in RNA processing, supporting further studies.


Assuntos
Medula Óssea , Mieloma Múltiplo , Proteínas do Tecido Nervoso , Receptores Imunológicos , Animais , Medula Óssea/metabolismo , Células da Medula Óssea , Células Endoteliais/metabolismo , Humanos , Camundongos , Mieloma Múltiplo/genética , Proteínas do Tecido Nervoso/genética , Proteínas do Tecido Nervoso/metabolismo , Receptores Imunológicos/genética , Receptores Imunológicos/metabolismo , Microambiente Tumoral/genética , Proteínas Roundabout
17.
Blood ; 138(18): 1705-1720, 2021 11 04.
Artigo em Inglês | MEDLINE | ID: mdl-34077955

RESUMO

Alterations in KRAS have been identified as the most recurring somatic variants in the multiple myeloma (MM) mutational landscape. Combining DNA and RNA sequencing, we studied 756 patients and observed KRAS as the most frequently mutated gene in patients at diagnosis; in addition, we demonstrated the persistence or de novo occurrence of the KRAS aberration at disease relapse. Small-molecule inhibitors targeting KRAS have been developed; however, they are selective for tumors carrying the KRASG12C mutation. Therefore, there is still a need to develop novel therapeutic approaches to target the KRAS mutational events found in other tumor types, including MM. We used AZD4785, a potent and selective antisense oligonucleotide that selectively targets and downregulates all KRAS isoforms, as a tool to dissect the functional sequelae secondary to KRAS silencing in MM within the context of the bone marrow niche and demonstrated its ability to significantly silence KRAS, leading to inhibition of MM tumor growth, both in vitro and in vivo, and confirming KRAS as a driver and therapeutic target in MM.


Assuntos
Mieloma Múltiplo/tratamento farmacológico , Mieloma Múltiplo/genética , Mutação/efeitos dos fármacos , Oligonucleotídeos Antissenso/farmacologia , Proteínas Proto-Oncogênicas p21(ras)/genética , Animais , Antineoplásicos/farmacologia , Antineoplásicos/uso terapêutico , Linhagem Celular Tumoral , Humanos , Camundongos SCID , Terapia de Alvo Molecular , Recidiva Local de Neoplasia/tratamento farmacológico , Recidiva Local de Neoplasia/genética , Oligonucleotídeos Antissenso/uso terapêutico , Bibliotecas de Moléculas Pequenas/farmacologia , Bibliotecas de Moléculas Pequenas/uso terapêutico
18.
Cancer Med ; 10(5): 1726-1737, 2021 03.
Artigo em Inglês | MEDLINE | ID: mdl-33594821

RESUMO

BACKGROUND: Intermittent treatment with TKIs is an option for the great majority (70%-80%) of CML patients who do not achieve a stable deep molecular response and are not eligible for treatment discontinuation. For these patients, the only alternative is to assume TKI continuously, lifelong. METHODS: The Italian phase III multicentric randomized OPTkIMA study started in 2015, with the aim to evaluate if a progressive de-escalation of TKIs (imatinib, nilotinib, and dasatinib) is able to maintain the molecular response (MR3.0 ) and to improve Health Related Quality of Life (HRQoL). RESULTS: Up to December 2018, 166/185 (90%) elderly CML patients in stable MR3.0 /MR4.0 completed the first year of any TKI intermittent schedule 1 month ON and 1 month OFF. The first year probability of maintaining the MR3.0 was 81% and 23.5% of the patients who lost the molecular response regained the MR3.0 after resuming TKI continuously. Patients' HRQoL at baseline was better than that of matched peers from healthy population. Women was the only factor independently associated with worse baseline HRQoL (p > 0.0001). Overall, global HRQoL worsened at 6 (p < 0.001) but returned to the baseline value at 12 months and it was statistically significantly worse in women (p = 0.001). CONCLUSIONS: De-escalation of any TKI by 1 month ON/OFF schedule maintains the MR3.0 /MR4.0 in 81% of the patients during the first 12-24 months. No patients progressed to accelerated/blastic phase, all the patients (23.5%) losing MR3.0 regained the MR3.0 and none suffered from TKI withdrawn syndrome. The study firstly report on HRQoL in elderly CML patients moving from a continuous daily therapy to a de-escalated intermittent treatment.


Assuntos
Leucemia Mielogênica Crônica BCR-ABL Positiva/tratamento farmacológico , Inibidores de Proteínas Quinases/administração & dosagem , Qualidade de Vida , Idoso , Idoso de 80 Anos ou mais , Dasatinibe/administração & dosagem , Dasatinibe/efeitos adversos , Progressão da Doença , Esquema de Medicação , Feminino , Humanos , Mesilato de Imatinib/administração & dosagem , Mesilato de Imatinib/efeitos adversos , Itália , Masculino , Pessoa de Meia-Idade , Dados Preliminares , Inibidores de Proteínas Quinases/efeitos adversos , Pirimidinas/administração & dosagem , Pirimidinas/efeitos adversos , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Fatores Sexuais , Fatores de Tempo
19.
Respir Res ; 22(1): 20, 2021 Jan 18.
Artigo em Inglês | MEDLINE | ID: mdl-33461535

RESUMO

BACKGROUND: COVID-19 causes acute respiratory distress syndrome (ARDS) and depletes the lungs of surfactant, leading to prolonged mechanical ventilation and death. The feasibility and safety of surfactant delivery in COVID-19 ARDS patients have not been established. METHODS: We performed retrospective analyses of data from patients receiving off-label use of exogenous natural surfactant during the COVID-19 pandemic. Seven COVID-19 PCR positive ARDS patients received liquid Curosurf (720 mg) in 150 ml normal saline, divided into five 30 ml aliquots) and delivered via a bronchoscope into second-generation bronchi. Patients were matched with 14 comparable subjects receiving supportive care for ARDS during the same time period. Feasibility and safety were examined as well as the duration of mechanical ventilation and mortality. RESULTS: Patients showed no evidence of acute decompensation following surfactant installation into minor bronchi. Cox regression showed a reduction of 28-days mortality within the surfactant group, though not significant. The surfactant did not increase the duration of ventilation, and health care providers did not convert to COVID-19 positive. CONCLUSIONS: Surfactant delivery through bronchoscopy at a dose of 720 mg in 150 ml normal saline is feasible and safe for COVID-19 ARDS patients and health care providers during the pandemic. Surfactant administration did not cause acute decompensation, may reduce mortality and mechanical ventilation duration in COVID-19 ARDS patients. This study supports the future performance of randomized clinical trials evaluating the efficacy of meticulous sub-bronchial lavage with surfactant as treatment for patients with COVID-19 ARDS.


Assuntos
Produtos Biológicos/administração & dosagem , Tratamento Farmacológico da COVID-19 , Pulmão/efeitos dos fármacos , Fosfolipídeos/administração & dosagem , Surfactantes Pulmonares/administração & dosagem , Idoso , Produtos Biológicos/efeitos adversos , Broncoscopia , COVID-19/diagnóstico , COVID-19/mortalidade , COVID-19/fisiopatologia , Estudos de Viabilidade , Feminino , Humanos , Pulmão/fisiopatologia , Masculino , Pessoa de Meia-Idade , Fosfolipídeos/efeitos adversos , Projetos Piloto , Surfactantes Pulmonares/efeitos adversos , Respiração Artificial , Estudos Retrospectivos , Fatores de Tempo , Resultado do Tratamento
20.
J Neurosurg Sci ; 65(2): 207-210, 2021 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-29480693

RESUMO

Cryptococcal meningoencephalitis is the most common infective complication observed in patients with CD4 lymphocytopenia, including sarcoidosis. T-cell immunity is well characterized in HIV-related infections and data regarding immunity in cryptococcosis animal models is now available; on the contrary, little is known about the immune status in non-HIV-related infections. We report on reduced production of new T cells observed in a patient with sarcoidosis, CD4 lymphocytopenia, and cryptococcal-related meningoencephalitis. Although T cells presented with an intact proliferative capacity, they were oligoclonally expanded showing an effector memory phenotype. However, the deleterious activity of effector memory cells could have been controlled by the expansion of the regulatory T cell subset with the highest suppressive capability. This information provides a better understanding of the immune response to Cryptococcus occurring in non-HIV-associated cases, the predisposition to infection, and the role of different cell subtypes in controlling the disease in humans.


Assuntos
Cryptococcus , Linfopenia , Meningite Criptocócica , Meningoencefalite , Sarcoidose , Animais , Linfócitos T CD4-Positivos , Homeostase , Humanos , Meningite Criptocócica/complicações , Sarcoidose/complicações
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