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Thyroid cell survival in coculture with autologous peripheral or intrathyroidal lymphocytes
Author(s) -
Massart C.,
Glbassler J.,
Gall F.,
Raoul M. L.,
Beurtin F.,
Genetet N.,
Genetet B.,
Lucas C.
Publication year - 1995
Publication title -
clinical endocrinology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 147
eISSN - 1365-2265
pISSN - 0300-0664
DOI - 10.1111/j.1365-2265.1995.tb02646.x
Subject(s) - cytotoxicity , lymphocyte , endocrinology , medicine , tumor necrosis factor alpha , lactate dehydrogenase , cytokine , immunology , biology , in vitro , biochemistry , enzyme
Summary OBJECTIVE We have studied lymphocyte Induced cytotoxicity and the production of interferon gamma (IFN‐α) and tumour necrosis factor alpha (TNF‐α) during coculture of thyrocytes and autologous lymphocytes from patients with Graves' disease and from normal subjects. PATIENTS Thyroid tissues and lymphocytes were obtained from 28 patients with Graves' disease and from 9 control subjects. MEASUREMENTS Lymphocyte induced cytotoxicity was evaluated on autologous thyrocytes using 5 metabolic tests: the MTT assay, the neutral red uptake, lactate dehydrogenase measurement and glutathione assay. IFN‐γ and TNF‐α measurements were performed after 1, 5 or 7 days' coculture. RESULTS The lymphocytes Isolated from peripheral blood (PB lymphocytes) altered the morphology and the metabolism of autologous thyrocytes. The Intrathyroidal lymphocytes Isolated after Dispase digestion were not toxic whereas mechanically Isolated lymphocytes exerted a little toxicity. No difference was seen between Graves' disease and normal cells.The supernatants from cocultures had higher IFN‐γ levels than those from lymphocyte cultures, in coculture, PB lymphocytes secreted more IFN‐γ and TNF‐α than Intrathyroidal lymphocytes. The PB lymphocyte Induced cytotoxicity was not due to IFN‐γ and TNF‐α alone. CONCLUSION Peripheral blood lymphocytes are cytotoxic in vitro to autologous thyrocytes whereas Intrathyroidal lymphocytes exert little or no cytotoxicity according to their isolation method. The mechanisms of lymphocyte Induced toxicity remain to be explained.