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J Nadkarni

Publications and source records attributed to J Nadkarni.

11 recordsLinked to original sources
PubMed2000

Intra-tumoral cytolytic cells: pattern of distribution in B-cell non Hodgkin s lymphoma.

Non-Hodgkin s lymphomas (NHLs) constitute a heterogeneous group of lymphoid neoplasms and a majority of them in India are of B-cell phenotype. Varying numbers of T lymphocytes and natural killer (NK) cells are consistently present within the lymph nodes (LNs). The role of these reactive cells is becoming understood. TIA-1 is a cytotoxic granule associated RNA binding protein, the expression of which is restricted to cytotoxic T lymphocytes (CTLs) and NK cells. Snap frozen lymph node biopsies obtained from 41 B-cell NHLs were localized for intra-tumoral TIA-1 + cytolytic cells by immunohistochemistry. Distribution of T cell subsets and NK cells were also quantified. Cells expressing TIA-1 antigen was observed in all the cases, seen as a strong granular cytoplasmic signal. Results indicate significantly higher number of TIA-1 cytolytic cells outside (periphery of the follicle and interfollicular areas) than within the neoplastic follicle in follicular lymphomas (p<0.001). In small lymphocytic lymphomas, cytolytic cells were mainly seen as uniformly scattered single cells, distributed throughout the tumor environment. In mantle cell and diffuse large B-cell lymphomas these were most often seen as small clusters and less frequently as singly scattered cells. Higher numbers of CD4 + than the CD8 + T cells were observed in most cases. Contrary to the follicles in follicular hyperplasia, CD57 + NK cells were predominantly observed outside the neoplastic follicle in follicular lymphomas (FLs). These results outline specific interactions between the potential anti-tumoral cytolytic and the malignant cells of B-cell NHLs.

Adult↗
PubMed1997

Non-Hodgkin's lymphoma: cytotoxic T lymphocyte mediated activity correlated with histopathological classification and staging.

Non-Hodgkin's lymphomas (NHLs) constitute a heterogeneous group of lymphoid tumors and a majority of them in India are of B-cell phenotype. It has been postulated that immunoregulatory dysfunctions may be involved in the pathogenesis of NHL. Hence, peripheral blood mononuclear cells obtained from twenty six untreated patients were assessed for cytotoxic T lymphocyte mediated (CTL) activity in 51Cr release assay. Patients were classified according to Revised European American Lymphoma classification. B-cell small lymphocytic lymphoma patients showed lower CTL activity than NHL patients of other histopathological subtypes and healthy individuals. Diffuse large B cell lymphomas showed CTL activity comparable to healthy individuals. However, within the same histopathological subgroup, the CTL activity did not correlate with the stage of the patients.

Adult↗
PubMed1997

Auto-tumor reactive cytotoxic T-cell responses in B-cell non-Hodgkin's lymphoma.

We have generated cytotoxic T-lymphocytes (CTLs) from the peripheral blood (PB) of eight B-cell non-Hodgkin's lymphoma (NHL) patients by in vitro coculture with autologous fresh tumor cells. Their functional activity was assessed in 51Cr release assay and was found to be MHC class I restricted. Our results indicate the presence of T-cells cytotoxic for autologous tumor cells in the PB of these patients but these were relatively small numbers in small lymphocytic lymphomas (SLLs). Treatment of fresh tumor cells with rIFN-gamma and rTNF-alpha alone, or in combination significantly increased their susceptibility in 4/5 cases of SLLs, and a case of diffuse large cell lymphoma and Burkitt lymphoma (BL), while, B-cell lymphoma, rich in T-cells, did not show any appreciable increase. Fresh tumor cells were also analysed for MHC class I and ICAM-1 antigens by flow cytometry, in 5/8 cases before and after cytokine treatment. Significant upregulation of MHC class I antigens but with no detectable change in ICAM-1 observed in a case of SLL and BL, correlated with enhanced susceptibility. These findings suggest the possible role of MHC class I antigens in the cytotoxic susceptibility of autologous tumor cells in B-cell NHL.

Cytotoxicity, Immunologic↗
PubMed1993

Pyknodysostosis.

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Asthma↗
PubMed1991

Production of interleukin-1 and tumour necrosis factor in non-Hodgkin's lymphoma patients.

Peripheral blood monocytes from non-Hodgkin's lymphoma (NHL) patients were assessed for the monocyte functions with respect to their ability to secrete interleukin-1 and tumour necrosis factor (TNF) and their cytotoxic potential to tumour target WEHI 164 clone 13. Our results indicate comparable levels of interleukin-1 and TNF production by NHL patients. The cytotoxic potential by monocytes was also not depressed in these patients. The data obtained suggest normal monocyte functions in NHL patients.

Adult↗
PubMed1989

Non-Hodgkin's lymphoma: natural cell-mediated cytotoxicity correlated with histological classification and prognosis.

Non-Hodgkin's lymphoma (NHL) patients classified according to the Rappaport classification system had depressed natural killer (NK) and NK cytotoxic factor activities, antibody-dependent cellular cytotoxicity, active killing potential as well as recycling capacity. The suppression of these activities was not related to the favorable or unfavorable prognosis of the patients. Paramaters of the NK cytotoxic status of the NHL patients did not correlate with the histology or prognosis of the disease.

Antibody-Dependent Cell Cytotoxicity↗