Detection of cytotoxic T-lymphocytes in tumour bearing animals: procedures to isolate highly active populations.
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Animals↗
Biomedical subjects
T Vijayakumar
Publications and source records attributed to T Vijayakumar.
Sister chromatid exchange frequencies in carcinoma of the human oral cavity: effect of treatment.
Spontaneous and mitomycin-C-induced sister chromatid exchange frequencies were studied in the lymphocytes of 25 oral cancer patients. For these patients, the mean spontaneous SCE value was 8.31 (+/- SD), which was significantly higher than the value of 6.60 (+/- SD) obtained for the controls (p < 0.001). But there was no significant difference between the Mitomycin C induced mean SCE values of oral cancer patients and controls. Seven of these 25 oral cancer patients were selected for second sampling after surgical removal of the tumor. Six of these seven patients showed a decrease in mean SCE/cell value following surgery, which was almost equal to the SCE values obtained for the controls. This indicates that the increased spontaneous SCE rates in oral cancer patients might be due to the metabolic stress imposed by the tumor on the host body or by some clastogenic product of the malignant cells. Surgical removal of the tumour might have resulted in normalization of the lymphocytic SCE rates in postoperatively studied patients.
Case-Control Studies↗
Expression of lectin binding in oral submucous fibrosis.
Lectins are a group of specific glycoproteins present in cells, particularly cell membrane. Recently, lectin binding studies have been used as a diagnostic as well as prognostic indicator of neoplasm's. Oral submucous fibrosis (OSMF) is a potential premalignant condition predominantly seen in Indian subcontinent. A comparison of expression of lectin binding was studied in normal tissue, OSMF cases and oral squamous cell carcinoma. The OSMF cases were grouped into early and advanced conditions as per the histopathologic criteria. Patterns of lectin binding observed with advanced OSMF cases were comparable with that of Oral squamous cell carcinoma. The role of lectin binding studies in assessing the malignant potential of a pre-malignant condition is discussed.
Carcinoma, Squamous Cell↗
Molecular cytogenetics of human cancer.
Cancer may arise from the genetic transformation of a single precursor cell, which proliferates to form a clone. Chromosomal abnormalities are associated with many types of tumours. Some of the chromosomal rearrangements such as translocation, deletion and insertion involve breakage of chromosomes close to known oncogenes. The close linkage between the chromosomal changes, the gene modifications and consequently altered protein function seen in malignant cells suggest that cancer is a genetic disease. Analysis of chromosomal abnormalities and oncogene amplifications in malignant cells have been found to be related to their malignant potential and hence may be utilized in the clinical management of patients with cancer.
Chromosome Aberrations↗
Jack fruit lectin binding pattern in the exfoliative cytology of bronchopulmonary neoplasia.
N-acetyl D- galactosamine specific jack fruit lectin conjugate was used for the cyto-chemical study of benign and neoplastic lesions of the respiratory tract using diaminobenzidine as substrate on exfoliated cells and tissue sections. Sputum samples from patients with benign respiratory tract lesions (40), squamous cell Carcinoma (20), adenocarcinoma (16), small cell anaplastic carcinoma (12) and large cell anaplastic carcinoma (5) were used for the study. The lectin binding was strong in squamous cell carcinoma, large cell anaplastic carcinoma and adenocarcinoma, but variations in the binding pattern were observed in different carcinoma. Squamous metaplastic cells manifested slightly increased binding to lectin as compared to bronchial and native squamous epithelial cells. The nature of binding was eventually similar in cytology and histology. The ready availability and ease of preparation in purified from makes the jack fruit lectin a potential cytochemical reagent for sputum cytology.
3,3'-Diaminobenzidine↗
Immunology of chronic generalized periodontitis. 2. Estimation of total hemolytic complement (CH 50) and its fractions C3 and C4.
The total hemolytic complement activity (CH50) and its fractions C3 and C4 were determined in forty patients with chronic generalized periodontitis (CGP). The values were compared with an equal number of age and sex matched periodontally healthy controls. Total hemolytic complement activity was expressed as number of CH50 units per ml of blood, while C3 and C4 levels were assessed by radial immunodiffusion and expressed as mg%. The observations showed a significant increase in CH50, C3 and C4 levels in the sera of patients with CGP. The study reveals the role of complement system in the pathogenesis of chronic generalized periodontitis.
Adult↗
Plant lectins--histochemical and cytochemical applications in oncology.
Lectins are sugar binding proteins or glycoproteins of non-immune origin derived from various plants or animals with specific sugar binding capacity. This property of lectins can be used to identify structural differences between normal and malignant cells. Malignant transformation is accompanied by several changes in cell membrane. Studies have shown that the lectin binding pattern of these cells may indicate the invasive potential of tumours. Lectins can also be used as carriers. Lectins conjugated to chemotherapeutic agents has been found to be more useful in the treatment of tumours induced in animals.
Agglutination Tests↗
Jack fruit lectin binding pattern in benign and malignant lesions of the breast.
N-acetyl D-galactosamine specific lectin was isolated from Jack fruit (Artocarpus integrifolia) and conjugated to horse radish peroxidase type VI. The purified conjugate was used for the study of tissue binding properties on benign and malignant lesions of the breast using diaminobenzidine as substrate on dewaxed tissue sections. Forty mammary carcinomas, 10 cystic hyperplasias of the breast and 10 normal breast tissues were used for the study. Neoplastic cells showed increased affinity to the lectin. The lectin binding was focally strong in neoplastic cells compared to the normal as well as the hyperplastic tissues. The stroma of the cancer tissues showed an intense strong binding where elastosis was present. The use of the lectin as a histochemical reagent is discussed.
Acetylgalactosamine↗
Incidence of hepatitis B surface antigen (HBsAg) in oral cancer and carcinoma of uterine cervix.
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Female↗
Immunoglobulins in the saliva of diabetic patients with periodontitis.
The study was conducted to estimate the concentration of immunoglobulins in the saliva of diabetic and nondiabetic patients with periodontitis. The salivary immunoglobulins G, A and M (IgG, IgA, IgM) were determined in 50 patients with type II or noninsulin dependent diabetes mellitus (NIDDM) and 50 non diabetic patients with periodontitis. The values were compared with that of 50 age and sex matched controls. IgG, IgA were found to be significantly increased in diabetic patients with periodontitis, compared to nondiabetic patients and controls. Though an increase in IgM was found in diabetic patients it was not significant. The altered immune response observed may be due to the response to a greater antigenic challenge which in turn may be responsible for the increased incidence of periodontitis in diabetic patients. Further studies in this field may help to establish this association.
Adult↗