RESUMO
Cutaneous T-cell lymphomas (CTCL) are a heterogeneous group of non-Hodgkin lymphomas that are considered incurable. The role of allogeneic hematopoietic SCT (HSCT) in the treatment of CTCL is not well defined but may provide potent graft-vs-lymphoma (GVL) activity independent of the conditioning therapy. We present outcomes of 12 extensively-pretreated patients with CTCL who underwent allogeneic HSCT using, most commonly, a reduced intensity conditioning regimen. Median age at diagnosis of CTCL was 49 years, and median time to transplantation from diagnosis was 3.3 years. Transplantation induced and maintained CR in six patients with active disease, supporting the presence of a GVL effect. TRM was low, and 42% of patients were alive and disease-free a median duration of 22 months after transplant. Two patients showed strong and direct evidence of a GVL-effect with a direct response to withdrawal of immunosuppression or to donor leukocyte infusion. Our data show that HSCT can provide long-term disease control in patients with advanced CTCL, which otherwise was refractory to immunotherapy and chemotherapy.
Assuntos
Transplante de Células-Tronco Hematopoéticas/métodos , Linfoma Cutâneo de Células T/cirurgia , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Quimeras de Transplante , Condicionamento Pré-Transplante/métodos , Transplante Homólogo/métodos , Resultado do TratamentoRESUMO
To understand better T-cell lymphomagenesis, we examined promoter CpG methylation and mRNA expression of closely related genes encoding p16, p15, and p14 tumor suppressor genes in cultured malignant T-cells that were derived from cutaneous, adult type, and anaplastic lymphoma kinase (ALK)-expressing T-cell lymphomas. p16 gene was epigenetically silenced in all but one of the 10 malignant T-cell lines examined, p15 gene silenced in roughly half of the lines, and p14 was the least frequently affected. Extensive methylation of the p16 promoter was seen in six out of 10 cutaneous T-cell lymphoma patient samples and corresponded with lack of p16 protein expression in the cases examined. Treatment of cultured T-cells with the DNA methyltransferase inhibitor, 5-aza-2-deoxy-cytidine, resulted in reversal of the p16 gene silencing. However, expression of p16 protein was delayed in relationship to p16 promoter demethylation and required up to 3 weeks to occur, seemingly reflecting late activation of the p16 gene. These findings indicate that epigenetic silencing affects in T-cell malignancies, often simultaneously, several tumor suppressor genes that impact on key cell functions. The observed differential silencing of p16 and p14, and to a lesser degree p15 gene, indicates that the silencing is governed by precise, promoter region-specific mechanisms. The study provides also further rationale for treatment of at least some types of T-cell lymphomas with DNA methyltransferase inhibitors to target the epigenetically silenced tumor suppressor genes.
Assuntos
Epigênese Genética , Regulação Leucêmica da Expressão Gênica , Inativação Gênica , Linfoma Cutâneo de Células T/metabolismo , Neoplasias Cutâneas/metabolismo , Proteína Supressora de Tumor p14ARF/biossíntese , Adulto , Quinase do Linfoma Anaplásico , Azacitidina/análogos & derivados , Azacitidina/farmacologia , Linhagem Celular Tumoral , Inibidor de Quinase Dependente de Ciclina p15/biossíntese , Metilação de DNA/efeitos dos fármacos , Metilases de Modificação do DNA/antagonistas & inibidores , Metilases de Modificação do DNA/metabolismo , Decitabina , Inibidores Enzimáticos/farmacologia , Epigênese Genética/efeitos dos fármacos , Regulação Leucêmica da Expressão Gênica/efeitos dos fármacos , Inativação Gênica/efeitos dos fármacos , Humanos , Linfoma Cutâneo de Células T/tratamento farmacológico , Linfoma Cutâneo de Células T/patologia , Regiões Promotoras Genéticas , Biossíntese de Proteínas/efeitos dos fármacos , Proteínas Tirosina Quinases/biossíntese , Receptores Proteína Tirosina Quinases , Neoplasias Cutâneas/tratamento farmacológico , Fatores de TempoRESUMO
Chronic graft-versus-host disease (cGVHD) is a multiorgan disorder with skin manifestations resembling scleroderma. Since photopheresis, a treatment that induces an anticlonotypic immune response, has proven to be effective in both cutaneous T cell lymphomas with circulating clonal T cells and in cGVHD, we have searched for circulating clonal T cell populations in patients with cGVHD, and determined whether T cell clonality in the blood is associated with therapeutic response. We screened blood samples from 27 patients after HLA-matched allogeneic bone marrow transplantation (allo-BMT), 10 without cGVHD and 17 with extensive cGVHD, for clonal T cell receptor gamma (TCR gamma) gene rearrangements using fluorescent-based polymerase chain reaction (PCR) and automated high-resolution capillary electrophoresis. Amplified populations of clonal T cells with unique TCR gamma gene rearrangements were found in six of 10 (60%) allo-BMT patients without cGVHD and 13 of 17 (76.5%) allo-BMT patients with cGVHD (P = 0.41), as compared to none of 10 (0%) healthy controls. Twelve patients with cGVHD were treated by photopheresis, and the presence of amplified populations of clonal T cells was found to be associated with a cutaneous response to photopheresis, as eight of eight (100%) clone-positive vs none of four (0%) clone-negative patients experienced a clinically significant cutaneous response to treatment (P = 0.001). Our findings suggest that patients with cGVHD that have detectable expanded clonal T cell populations in their peripheral blood, may be more likely to respond to treatment by photopheresis.
Assuntos
Doença Enxerto-Hospedeiro/terapia , Fotoferese , Linfócitos T/citologia , Adulto , Biomarcadores , Células Sanguíneas , Estudos de Casos e Controles , Doença Crônica , Células Clonais , Feminino , Rearranjo Gênico , Genes Codificadores da Cadeia gama de Receptores de Linfócitos T , Doença Enxerto-Hospedeiro/imunologia , Neoplasias Hematológicas/complicações , Humanos , Masculino , Pessoa de Meia-Idade , Prognóstico , Dermatopatias/etiologia , Dermatopatias/terapiaRESUMO
We report the case of a 43-year-old male patient with persistent multifocal, skin-restricted, CD30-positive, large T-cell lymphoma. Combination therapy of systemic interferon alfa and oral bexarotene was initiated on an experimental basis in the hope of circumventing therapies such as methotrexate, radiotherapy, or multiple-agent chemotherapy that may be required in such cases. This treatment was associated with rapid and marked regression of the patient's cutaneous lesions.
Assuntos
Anticarcinógenos/administração & dosagem , Antineoplásicos/administração & dosagem , Interferon-alfa/administração & dosagem , Antígeno Ki-1/análise , Linfoma Cutâneo de Células T/tratamento farmacológico , Neoplasias Cutâneas/tratamento farmacológico , Tetra-Hidronaftalenos/administração & dosagem , Administração Oral , Adulto , Bexaroteno , Quimioterapia Combinada , Humanos , Linfoma Cutâneo de Células T/patologia , Masculino , Neoplasias Cutâneas/patologiaRESUMO
We treated 4 patients with refractory International Society of Heart and Lung Transplantation Grades IIIA to IV cardiac allograft rejection with extracorporeal photopheresis. Following treatment on 2 consecutive days, 3 patients demonstrated complete histologic reversal of rejection. The remaining patient improved more gradually, but manifested complete cessation of rejection following three 2-day treatments. We conclude that photopheresis is a safe and effective modality for the treatment of severe refractory cardiac allograft rejection and that these results support the use of photopheresis in this clinical setting.
Assuntos
Rejeição de Enxerto/terapia , Transplante de Coração , Fotoferese , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-IdadeRESUMO
Recent phase I and phase II trials using recombinant human interleukin-12 (rhIL-12) for cutaneous T cell lymphoma (CTCL) have been completed. Observations on 32 evaluable patients revealed an overall response rate approaching 50 percent. Biopsy of regressing lesions revealed an increase in numbers of CD8+ and/or TIA-1+ T cells. These results suggest that rhIL-12 may induce lesion regression by augmenting antitumor cytotoxic T cell responses. Future trials will be focused on strategies for further immune enhancement by the concomitant use of additional immune augmenting cytokines with rhIL-12.
Assuntos
Antineoplásicos/uso terapêutico , Interleucina-12/uso terapêutico , Linfoma Cutâneo de Células T/tratamento farmacológico , Neoplasias Cutâneas/tratamento farmacológico , Antígenos de Diferenciação de Linfócitos T/análise , Antígenos de Diferenciação de Linfócitos T/imunologia , Antineoplásicos/efeitos adversos , Humanos , Imuno-Histoquímica , Interleucina-12/efeitos adversos , Linfócitos do Interstício Tumoral/imunologia , Linfoma Cutâneo de Células T/imunologia , Proteínas Recombinantes/uso terapêutico , Neoplasias Cutâneas/imunologia , Subpopulações de Linfócitos T/classificação , Linfócitos T Citotóxicos/imunologia , Resultado do TratamentoRESUMO
OBJECTIVES: To search for circulating clonal T-cell populations in patients with systemic sclerosis (SSc), and to determine whether T-cell clonality in the blood predicts therapeutic response to photopheresis. DESIGN: Analysis of clonal T-cell receptor gamma gene rearrangements before photopheresis treatment and blinded clinical evaluation of cutaneous response to photopheresis in a case series. SETTING: University hospital setting. PATIENTS: Thirteen consecutive patients with SSc. INTERVENTIONS: Photopheresis in 11 patients. MAIN OUTCOME MEASURES: Clonality of T cells in the blood before photopheresis and clinical response to photopheresis. RESULTS: Screening of blood samples from 13 SSc patients for clonal T-cell receptor gamma gene rearrangements revealed a monoclonal T cell population in 6 (46%) of 13 SSc patients. Clinical response to photopheresis in 11 patients was evaluated in a blinded manner using skin severity scores. Clonality of T cells appeared to be associated with a higher chance of response to photopheresis therapy, as 4 (67%) of 6 patients in the clone-positive group vs 1 (20%) of 5 in the clone-negative group experienced a clinically significant response to treatment. CONCLUSIONS: A high proportion of patients with SSc have detectable expanded clonal T-cell populations in the peripheral blood, and such patients appear more likely to respond to photopheresis.
Assuntos
Rearranjo Gênico da Cadeia gama dos Receptores de Antígenos dos Linfócitos T , Fotoferese , Escleroderma Sistêmico/sangue , Escleroderma Sistêmico/tratamento farmacológico , Adulto , Idoso , Feminino , Humanos , Leucócitos Mononucleares , Masculino , Pessoa de Meia-Idade , Reação em Cadeia da Polimerase , Índice de Gravidade de Doença , Resultado do TratamentoRESUMO
Cutaneous T-cell lymphoma (CTCL) is most often a skin-infiltrating malignancy of clonal CD4+ T-cells. Therapy is based on staging and the likelihood of progression. Biological response modifiers and chemotherapeutic agents are used to preserve the integrity of the host antitumour response while selectively targeting the malignant cells. The biological response-modifying treatment options currently used to treat CTCL are bexarotene, denileukin diftitox, interferon-alpha, interferon-gamma and interleukin-12, as well as extracorporeal photopheresis and phototherapy. A combination therapy approach maximises response in patients with advanced CTCL. Biological response modifiers in combination with photopheresis are used for patients with the leukaemic phase of the disease. Among the majority of patients with advanced stage disease so treated, immune response augmentation appears to prolong survival. Future areas of research should assess not only survival and optimal treatment combinations, but also quality of life during the treatment period.
Assuntos
Toxina Diftérica , Fatores Imunológicos/uso terapêutico , Interleucina-2 , Linfoma Cutâneo de Células T/tratamento farmacológico , Bexaroteno , Humanos , Interferon-alfa/uso terapêutico , Interleucina-12/uso terapêutico , Fotoferese , Fototerapia , Proteínas/uso terapêutico , Proteínas Recombinantes de Fusão , Tetra-Hidronaftalenos/uso terapêuticoRESUMO
BACKGROUND: Cutaneous T-cell lymphoma (CTCL) is a clonally derived, skin-invasive malignancy of CD4(+) T lymphocytes with the phenotype of mature helper T cells. Advancing stages of CTCL are associated with depressed cell-mediated immunity, increased production of T helper type 2 cytokines and decreased levels of T helper type 1 cytokines. OBJECTIVE: Our purpose was to evaluate the cytokine secretion pattern and cell-mediated cytotoxicity in peripheral blood mononuclear cells of patients with Sézary syndrome in relation to the presence of the malignant clone. METHODS: Serial polymerase chain reaction for the T-cell receptor-beta or T-cell receptor-gamma gene rearrangement was used to determine the presence of the malignant clone. Enzyme-linked immunosorbent assays were used to determine the levels of interleukin 4 and interferon gamma produced by the peripheral blood mononuclear cells from the patients with Sézary syndrome. RESULTS: We demonstrate 3 cases of Sézary syndrome with typically suppressed cell-mediated cytotoxicity, elevated production of interleukin 4, and depressed production of interferon gamma by their peripheral blood mononuclear cells before institution of therapy with biologic response modifier therapy. In all 3 cases after clinical and molecular remission, we observed striking immunologic changes, including an increase in levels of natural killer cell activity and interferon gamma production and decreased production of interleukin 4. CONCLUSIONS: The observation that the cytokine secretion pattern by peripheral blood mononuclear cells from 3 patients with Sézary syndrome normalized with the disappearance of the malignant clone from the peripheral blood suggests that the malignant T cells account for the aberrant cytokine production. Moreover, the aberrant cytokine production may be the cause for suppression of cell-mediated immunity seen in advancing stages of CTCL.
Assuntos
Antineoplásicos/uso terapêutico , Citotoxicidade Imunológica , Fatores Imunológicos/uso terapêutico , Interferon-alfa/uso terapêutico , Interferon gama/biossíntese , Interleucina-4/biossíntese , Células Matadoras Naturais/imunologia , Síndrome de Sézary/tratamento farmacológico , Neoplasias Cutâneas/tratamento farmacológico , Células Th1/imunologia , Idoso , Rearranjo Gênico do Linfócito T , Genes Codificadores da Cadeia beta de Receptores de Linfócitos T/genética , Genes Codificadores da Cadeia gama de Receptores de Linfócitos T/genética , Humanos , Interferon alfa-2 , Masculino , Pessoa de Meia-Idade , Fotoferese , Reação em Cadeia da Polimerase , Proteínas Recombinantes , Síndrome de Sézary/genética , Síndrome de Sézary/imunologia , Neoplasias Cutâneas/genética , Neoplasias Cutâneas/imunologia , Subpopulações de Linfócitos T , Células Th1/metabolismoRESUMO
Initial phase I and II clinical trials with recombinant human interleukin-12 have demonstrated the therapeutic efficacy of this cytokine in early stage cutaneous T cell lymphoma as compared with more advanced stages such as the leukemic Sézary syndrome. In an effort to optimize the use of recombinant human interleukin-12, using flow cytometry we studied the regulation of the interleukin-12 receptor beta1 (high affinity chain) and beta2 (chain necessary for interleukin-12 signal transduction) on normal volunteer CD4+ and CD8+ T cells and CD4+ and CD8+ cells from eight patients with different degrees of leukemic involvement with Sézary syndrome. The beta1 chain was not readily detectable on resting normal and T cells from Sézary patients, but expression was induced following T cell activation with phytohemagglutinin. Similarly, the beta2 chain was not detectable on resting normal volunteer T cells, but could be induced following phytohemagglutinin stimulation. Moreover, the beta2 chain on normal volunteer T cells was markedly upregulated following short-term culture with interferon-gamma or recombinant human interleukin-12. CD8+ T cells routinely exhibited a greater expression of beta2 than did CD4+ T cells. In marked contrast, both CD4+ and CD8+ T cells from patients with Sézary syndrome and a high tumor cell burden (> 50% circulating atypical Sézary T cells) failed to express the beta2 chain under any culture conditions. Although, culture with anti-interleukin-10 also markedly increased beta2 expression on normal volunteer T cells, this failed to induce expression on either CD4+ or CD8+ T cells from Sézary patients and a high tumor burden. Investigation of patients with Sézary syndrome and a low tumor cell burden (< 15% circulating Sézary T cells) revealed a pattern of beta2 expression that was intermediate between advanced Sézary syndrome and normal volunteers. Both CD4+ and CD8+ peripheral blood T cells from these earlier stage patients were induced to express the beta2 chain, although at a lower frequency of positivity than T cells from normals, following culture with phytohemagglutinin, interferon-gamma, recombinant human interleukin-12, or anti-interleukin-10. These results indicate that short-term culture with interferon-gamma and recombinant human interleukin-12 potently upregulates beta2 chain expression on T cells from normal volunteers, whereas a similar, but less marked effect occurs on T cells from Sézary syndrome patients and a low circulating tumor cell burden. In contrast, the beta2 chain appears to be suppressed on both CD4+ and CD8+ T cells from Sézary patients with a heavy circulating tumor cell burden and it is not induced by interferon-gamma or recombinant human interleukin-12. Therefore, recombinant human interleukin-12 is likely to be most effective for early stage cutaneous T cell lymphoma due to a greater display of beta2 receptors on responding CD8+ anti-tumor cytotoxic T cells.
Assuntos
Linfócitos T CD4-Positivos/imunologia , Linfócitos T CD8-Positivos/imunologia , Receptores de Interleucina/biossíntese , Síndrome de Sézary/imunologia , Neoplasias Cutâneas/imunologia , Anticorpos/farmacologia , Antineoplásicos/farmacologia , Linfócitos T CD4-Positivos/efeitos dos fármacos , Linfócitos T CD4-Positivos/metabolismo , Linfócitos T CD8-Positivos/efeitos dos fármacos , Linfócitos T CD8-Positivos/metabolismo , Citometria de Fluxo , Humanos , Interferon gama/farmacologia , Interleucina-10/imunologia , Interleucina-10/metabolismo , Interleucina-12/farmacologia , Células Neoplásicas Circulantes , Fito-Hemaglutininas , Receptores de Interleucina-12 , Síndrome de Sézary/metabolismo , Pele/citologia , Pele/imunologia , Pele/metabolismo , Neoplasias Cutâneas/metabolismo , Linfócitos T Citotóxicos/imunologia , Linfócitos T Citotóxicos/metabolismoRESUMO
BACKGROUND: Peripheral eosinophilia occurs in a small subpopulation of patients with cutaneous T-cell lymphoma (CTCL) and denotes a poor prognosis. Clinical studies have suggested that the Sézary cell is a T(H)2 type helper T cell that produces cytokines that enhance the differentiation and activation of eosinophils. Interferon alfa (IFN-alpha) and interleukin 12 are effective therapeutic agents for CTCL and other hematologic disorders. OBJECTIVE: Our purpose was to determine the inhibitory activity of IFN-alpha and IL-12 on IL-5 production in vitro by peripheral blood mononuclear cells (PBMCs) obtained from patients with CTCL and eosinophilia. METHODS: Suppression of IL-5 production by IFN-alpha and IL-12 was assessed by comparing IL-5 production by PBMCs from patients with Sézary syndrome and eosinophilia when cultured alone or in the presence of either IFN-alpha or IL-12. RESULTS: A marked increase in IL-5 production by PBMCs from patients with Sézary syndrome and eosinophilia was observed. IL-5 production was markedly reduced when PBMCs were exposed to IFN-alpha or IL-12. CONCLUSION: These results suggest that IFN-alpha and perhaps IL-12 may produce a therapeutic response in patients with CTCL and eosinophilia through direct suppression of IL-5 production by malignant Sézary cells.
Assuntos
Interferon Tipo I/farmacologia , Interleucina-12/farmacologia , Interleucina-5/biossíntese , Síndrome de Sézary/imunologia , Neoplasias Cutâneas/imunologia , Células Cultivadas , Eosinofilia/sangue , Eosinofilia/imunologia , Humanos , Leucócitos Mononucleares/imunologia , Leucócitos Mononucleares/metabolismo , Masculino , Pessoa de Meia-Idade , Proteínas RecombinantesRESUMO
Extracorporeal photopheresis (ECP) is an immunologic modality that has shown efficacy in the treatment of clonal T-cell diseases, including Sézary syndrome and allograft rejection. In this case report, we expand on this observation to include recalcitrant hepatic allograft rejection. A 14-year-old boy with hepatic allograft rejection refractory to high-dose corticosteroid and lymphocytolytic therapy was treated with 4 sessions of ECP over a 6-week period. After 2 sessions, a liver biopsy showed complete reversal of acute cell-mediated rejection. No opportunistic infections or other adverse events were noted. Photopheresis appears to be a safe and effective modality for the treatment of refractory hepatic allograft rejection.
Assuntos
Rejeição de Enxerto/terapia , Transplante de Fígado , Fotoferese , Adolescente , Rejeição de Enxerto/patologia , Humanos , Fígado/patologia , Masculino , Indução de RemissãoRESUMO
Chlamydia pneumoniae is a common cause of pulmonary infection, with serum positivity in at least 50% of the general population. In this study, we report that human PBMCs exposed to C. pneumoniae are resistant to apoptosis induced by the potent photoactivated chemotherapeutic agents 8-methoxypsoralen and hypericin. In contrast, PBMCs treated with a heat-inactivated inoculum exhibit normal susceptibility to apoptosis. We also observed that human PBMCs are responsive to C. pneumoniae infection by secretion of key immune regulatory cytokines, including IL-12 and IL-10. While IL-12 may play an important role in limiting C. pneumoniae proliferation within cells, IL-10 serves an anti-inflammatory function by down-regulating proinflammatory cytokines such as IL-12 and TNF-alpha. Depletion of endogenous IL-10, but not of IL-12, abolished the apoptosis resistance of C. pneumoniae-infected PBMCs. Furthermore, addition of exogenous IL-10, but not IL-12, significantly increased the resistance of control inoculum-treated PBMCs to photoactivated 8-methoxypsoralen- and hypericin-induced apoptosis. Therefore, we conclude that C. pneumoniae possesses an antiapoptotic mechanism. The resistance to apoptosis observed in PBMCs exposed to C. pneumoniae is due, at least partially, to the IL-10 induced during C. pneumoniae infection.
Assuntos
Apoptose/imunologia , Chlamydophila pneumoniae/imunologia , Interleucina-10/biossíntese , Leucócitos Mononucleares/imunologia , Leucócitos Mononucleares/microbiologia , Antracenos , Apoptose/efeitos dos fármacos , Relação Dose-Resposta Imunológica , Humanos , Imunidade Inata/efeitos dos fármacos , Interleucina-10/sangue , Interleucina-10/fisiologia , Interleucina-12/biossíntese , Interleucina-12/metabolismo , Interleucina-12/fisiologia , Leucócitos Mononucleares/citologia , Leucócitos Mononucleares/efeitos dos fármacos , Metoxaleno/farmacologia , Perileno/análogos & derivados , Perileno/farmacologia , Fator de Necrose Tumoral alfa/biossíntese , Fator de Necrose Tumoral alfa/metabolismoRESUMO
BACKGROUND: Extracorporeal photopheresis (ExP) is an effective therapy for several conditions including cutaneous T-cell lymphoma, scleroderma, and allograft rejection. Experimental animal models suggest that ExP may induce antigen-specific immunosuppression. OBJECTIVE: Our purpose was to determine the effect of photopheresis on humoral and cell-mediated immunity in human subjects. METHODS: Recall and primary immune responses of patients with scleroderma receiving monthly ExP treatments were assessed by delayed type hypersensitivity skin tests, T-cell proliferative responses after immunizations with tetanus toxoid and keyhole limpet hemocyanin, and serum antibody titers against common viral pathogens. RESULTS: After 6 months of ExP, viral antibody titers and delayed type hypersensitivity responses were not significantly different from baseline values in all 7 patients tested. T-cell responses to tetanus toxoid remained normal in 3 of 3 patients tested for a minimum of 6 months after booster immunization. Immunization with the protein antigen keyhole limpet hemocyanin after initiation of ExP therapy resulted in sustained T-cell proliferative responses up to 6 months in 3 of 3 patients. CONCLUSION: These results, along with the observation of no increased incidence of opportunistic infections or neoplasms, suggest that ExP is not broadly immunosuppressive and does not prevent primary responses to vaccination or other antigenic challenges.
Assuntos
Linfócitos B/imunologia , Fotoferese , Escleroderma Sistêmico/imunologia , Escleroderma Sistêmico/terapia , Linfócitos T/imunologia , Formação de Anticorpos , Humanos , Imunidade Celular , Testes CutâneosRESUMO
Photopheresis is a leukapheresis-based therapy that utilizes 8-methoxypsoralen and ultraviolet A irradiation. Photopheresis is currently available at approximately 150 medical centers worldwide. Recent evidence suggests that this therapy used as a single agent may significantly prolong life, as well as induce a 50%-75% response rate among individuals with advanced cutaneous T cell lymphoma (CTCL). Furthermore, a 20%-25% complete response rate with photopheresis alone, or in combination with other biologic response modifiers, has been obtained at our institution among patients with Sezary syndrome. These complete responses have been characterized by the complete disappearance of morphologically atypical cells from the skin and blood. The use of sensitive molecular techniques has also confirmed the sustained disappearance of the malignant T cell clone from the blood of patients with complete responses. In addition to the treatment of CTCL, numerous reports indicate that photopheresis is a potent agent in the therapy of acute allograft rejection among cardiac, lung, and renal transplant recipients. Chronic graft versus host disease also appears to be quite responsive to photopheresis therapy. Likewise, there may also be a potential role for photopheresis in the therapy of certain autoimmune diseases that are poorly responsive to conventional therapy. The immunologic basis for the responses of patients with these conditions is likely due to the induction of anticlonotypic immunity directed against pathogenic clones of T lymphocytes. Treatment-induced apoptotic death of pathogenic T cells and activation of antigen presenting cells are postulated to have important effects in this therapeutic process.
Assuntos
Fotoferese , Animais , Doenças Autoimunes/terapia , Rejeição de Enxerto/prevenção & controle , Humanos , Linfoma Cutâneo de Células T/terapia , Neoplasias Cutâneas/terapiaRESUMO
Sézary syndrome (SS) is the leukemic phase of cutaneous T cell lymphoma characterized by the proliferation of clonally derived CD4+ T cells that release cytokines of the Th2 T cell phenotype (IL-4, IL-5, IL-10), whereas Th1 T cell cytokines (IL-2, IFN-gamma) are markedly depressed as is expression of IL-12, a pivotal cytokine for Th1 cell differentiation. Normal Th1 cells express both the beta 1 and beta 2 chains of the IL-12 receptor (IL-12R) and tyrosine phosphorylate STAT4 in response to IL-12. Th2 T cells express only the IL-12R beta 1 and thus do not tyrosine phosphorylate STAT4 in response to IL-12. To determine whether SS cells are Th2-like at the level of IL-12 signal transduction, we analyzed RNA from seven patients for the presence of message for the IL-12R beta 1 and beta 2 genes using RNase protection assays and assessed whether IL-12 induced tyrosine-phosphorylation of STAT4 by immunoblotting. In PBL from six of seven SS patients tested, beta 2 message was expressed at low to undetectable levels and its expression could not be stimulated by either IFN-alpha or IFN- gamma, which stimulated beta 2 expression in control PBL. The absence of beta 2 expression is further supportive evidence for the Th2 lineage of SS cells. However, unlike normal Th2 cells, SS cells also showed severely reduced levels of STAT4, suggesting that they have a depressed response to any inducer of the STAT4 signal transduction pathway, including IFN-alpha. This is the first observation linking STAT4 gene expression with a human disease and suggests that dysregulation of STAT4 expression may be significant to the development and/or progression of SS.
Assuntos
Proteínas de Ligação a DNA/antagonistas & inibidores , Interleucina-12/antagonistas & inibidores , Interleucina-12/fisiologia , RNA Mensageiro/genética , Receptores de Interleucina/genética , Síndrome de Sézary/imunologia , Transdução de Sinais/imunologia , Linfócitos T/metabolismo , Transativadores/antagonistas & inibidores , Linfócitos T CD8-Positivos/imunologia , Linfócitos T CD8-Positivos/metabolismo , Linfócitos T CD8-Positivos/patologia , Proteínas de Ligação a DNA/metabolismo , Regulação Neoplásica da Expressão Gênica/imunologia , Humanos , Soros Imunes/farmacologia , Interferon-alfa/farmacologia , Interferon gama/farmacologia , Interleucina-12/metabolismo , Interleucina-4/antagonistas & inibidores , Interleucina-4/imunologia , Fosforilação , RNA Mensageiro/biossíntese , Receptores de Interleucina/biossíntese , Receptores de Interleucina/deficiência , Receptores de Interleucina-12 , Fator de Transcrição STAT4 , Síndrome de Sézary/metabolismo , Síndrome de Sézary/patologia , Linfócitos T/imunologia , Linfócitos T/patologia , Transativadores/metabolismoRESUMO
Progression of cutaneous T-cell lymphoma (CTCL) is associated with profound defects in cell-mediated immunity and depressed production of cytokines, which support cell-mediated immunity. Because we have observed marked defects in interleukin-12 (IL-12) production in CTCL and because IL-12 is critical for antitumor cytotoxic T-cell responses, we initiated a phase I dose escalation trial with recombinant human IL-12 (rhIL-12) where patients received either 50, 100, or 300 ng/kg rhIL-12 twice weekly subcutaneously or intralesionally for up to 24 weeks. Ten patients were entered: 5 with extensive plaque, 3 with Sezary syndrome, and 2 with extensive tumors with large cell transformation. One patient with Sezary syndrome dropped out after 1 week for personal reasons. Subcutaneous dosing resulted in complete responses (CR) in 2 of 5 plaque and partial responses (PR) in 2 of 5 plaque, and 1 of 2 Sezary syndrome (overall response rate CR+PR 5 of 9, 56%). A minor response also occurred in 1 of 5 plaque patients. Intralesional dosing resulted in individual tumor regression in 2 of 2 patients. Biopsy of regressing lesions showed a significant decrease in the density of the infiltrate in all cases and complete resolution of the infiltrate among those with clinical lesion resolution. An increase in numbers of CD8-positive and/or TIA-1-positive T cells were observed on immunohistochemical analysis of skin biopsy specimens obtained from regressing skin lesions. Adverse effects of rhIL-12 on this regimen were minor and limited and included low-grade fever and headache. One patient discontinued rhIL-12 at week 6 because of depression. These results suggest that rhIL-12 may augment antitumor cytotoxic T-cell responses and may represent a potent and well-tolerated therapeutic agent for CTCL.
Assuntos
Linfócitos T CD8-Positivos/imunologia , Citotoxicidade Imunológica , Interleucina-12/administração & dosagem , Linfoma Cutâneo de Células T/tratamento farmacológico , Neoplasias Cutâneas/tratamento farmacológico , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Injeções Intravenosas , Injeções Subcutâneas , Ativação Linfocitária/efeitos dos fármacos , Linfoma Cutâneo de Células T/imunologia , Linfoma Cutâneo de Células T/patologia , Masculino , Pessoa de Meia-Idade , Proteínas Recombinantes/administração & dosagem , Indução de Remissão , Neoplasias Cutâneas/imunologia , Neoplasias Cutâneas/patologiaRESUMO
We have demonstrated previously that cells from both the skin and peripheral blood from patients with cutaneous T cell lymphoma (CTCL) have elevated levels of protein and mRNA for Th2 cytokines, interleukin-4 (IL-4) and IL-5, and depressed levels of Thl cytokines, IL-2 and interferon-gamma (IFN-gamma). Furthermore, IL-12 in vitro can restore IFN-gamma production by these patients' cells to near normal levels. Because retinoids exert therapeutic activity in CTCL and are potent modulators of growth and differentiation of hematopoietic cells, we investigated the role of retinoids in modulating Thl cytokine production. Peripheral blood mononuclear cells (PBMC) from normal donors and patients with CTCL were cultured with medium, IL-2, 13-cis-retinoic acid, all-trans-retinoic acid, acetretin or etretinate alone, or IL-2 plus the retinoids for 24 h, and levels of IFN-gamma were determined using ELISA. IL-2 or retinoids alone could induce low but significant levels of IFN-gamma. However, when IL-2 was cultured with each retinoid, a synergistic augmentation of IFN-gamma levels (4-fold to 90-fold) was observed except in the case of etretinate. All-trans-retinoic acid (ATRA) was the most potent IFN-y inducer. Similar studies performed using PBMC from CTCL patients indicated the IFN-gamma augmentation occurred but in a blunted manner. The IFN-y-inducing effect of ATRA and 13-cis-retinoic acid could be abrogated by addition of anti-IL-12 antibodies, suggesting that IL-12 plays a role in the synergistic upregulation of IFN-gamma. Using an IL-12 p40-specific radioimmunoassay (RIA), we confirmed the presence of IL-12 in IL-2 plus retinoid-treated culture supernatants. Purified monocytes cultured with IL-2 plus ATRA did not secrete IL-12. Only when monocytes were cocultured with lymphocytes was there an increase in IL-12 production, suggesting the involvement of a paracrine feedback loop requiring both monocytes and lymphocytes. These data suggest that retinoids can induce Th1 cytokines from normal and CTCL PBMC and that this induction may be mediated through IL-12 production.