[Action of 5-iodo-2'-desoxyuridine (IDU) on several DNA viruses in cell cultures].
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DNA Viruses↗
Biomedical subjects
D Olive
Publications and source records attributed to D Olive.
[A comparative study of some biological properties of measles virus in human thyroid cell culture].
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In Vitro Techniques↗
[Myofibromatosis in children. Histopathologic and ultrastructural study of a localized form with a spontaneously regressive course].
Report of a case of the localized form of infantile myofibromatosis, in a three-month-old boy with a brachial mass and osteolytic lesion of the adjacent humerus at radiographic examination. Diagnosis is made on the histopathological features of the lesion at biopsy. Ultrastructurally, the tumor cells have myofibroblastic differentiations. Evolution is regressive without any treatment. The anatomical, clinical, pathological, ultrastructural and evolutive features are discussed.
Arm↗
Differential immuno-suppressive effects of metabolic inhibitors on T-lymphocyte activation.
An important challenge in the field of auto-immune diseases, bone marrow and organ transplantation is the control of T-lymphocyte activation. To gain more insight into the in vitro correlation of immunosuppression, we investigated the effects of cyclosporin A (CSA) and two other metabolic inhibitors on cytokine secretion and T-cell proliferation. Secretion of TNF-alpha and GM-CSF was much more resistant to metabolic inhibitors than proliferation or synthesis of IL-1 alpha or IL-2. Moreover, our data suggested that the regulation of IL-1 alpha production in T-cells was CSA and protein kinase C (PKC)-dependent, as opposed to monocytes regulation. The receptivity to the epithelial cell-derived cytokine IL-7, associated either with antigen-dependent or independent triggering, was almost similarly inhibited by cyclosporin A, forskolin or PKC inhibitor, in sharp contrast to IL-2 receptivity. In this latter case, CD28+ IL-2 stimulation was more sensitive to both forskolin and PKC inhibition than that of CD2 or CD3+ IL-2. With regard to CSA effects, limiting dilution analysis provided evidence for some heterogeneity at the clonal level. This strongly suggested that T-cell functional monitoring at the population level does not truly reflect the actual immunosuppression. Additional experiments are required to evaluate the sensitivity to metabolic inhibitors of T-lymphocyte activation via the natural ligands of CD2 and CD28.
Antigens, CD↗
Interleukin-7, a major T-lymphocyte cytokine.
IL-7 is a single-chain 25 kDa protein first identified in bone marrow cultures through its pre-B cell growth factor properties, then also described as a potent T-lymphocyte growth factor. This review relates to the molecular and functional aspects of interleukin-7 (IL-7) and its receptor (IL-7R). We focused on the role of IL-7 in T-cell activation, cytotoxicity generation, leukemic cell growth and immunotherapy.
Amino Acid Sequence↗
Tolerance and feasibility of perioperative treatment with interferon-alpha 2a in advanced cancers.
BACKGROUND: Major surgery impairs the cellular immune response. In order to stimulate the immunological system during the perioperative period, we have studied the clinical and biological tolerance, and the immunological and histological effects of a perioperative treatment using progressive doses of Interferon-alpha 2a, from the third preoperative day (D-3) until the tenth postoperative day (D10). MATERIALS AND METHODS: Twenty-three patients undergoing a major surgical procedure for advanced cancer were included. The clinical and biological parameters evaluated were the body temperature and the blood cell counts. Immunological effects were evaluated by counting the total number of lymphocytes, lymphocyte subsets, natural killer cells (NK), and by analysis of the NK activity, and lymphokine-activated killer cell (LAK) assay. RESULTS: Hyperthermia was the most toxic effect of Interferon-alpha but the overall toxicity was minor, even at the highest dose level. In the early postoperative period there was a significant decrease in total lymphocytes, and in most lymphocyte subset counts when compared with D-3. Overall NK and LAK activities significantly increased from D-3 to D-1 (p < 0.02). A postoperative decrease in NK activity was noted that was not significant when compared to pretherapeutic values, whereas a significant decrease in LAK activity did occur on D4 despite the interferon treatment (p < 0.03). Since we found a dose-dependent effect on some lymphocyte subsets, there was not a clear dose-dependent effect on NK and LAK activities. CONCLUSIONS: Perioperative alpha 2a administration is a safe treatment in advanced cancer patients that may allow a postoperative preservation of NK activity and a destruction of potential circulating metastatic cells. Further studies are ongoing on perioperative immunotherapy in advanced cancer patients.
Adolescent↗
[Evolution of methods of chemotherapy in solid tumors in the children].
First, chemotherapy was used to reduce metastatic tumours. Then, instead of a limited number of antimitotic agents, it permited to increase both the number of complete remissions and the survival ratio, mostly in embryonal tumours and lymphomas. The essential purpose of chemotherapy is to kill occult metastases. Combination chemotherapy using many agents with differing modes of action took place of monochemotherapy. In sophisticated schedules, drugs are given intermittently, to synchronizing treatment with the tumour doubling time and the recovery of normal rapidly dividing tissues. Unhappily, its use remains empiric, according to uncertainty about tumoral cell kinetic and modes of drugs action. Immediate toxicity of aggressive schedules prescribe to realize them in specialized pediatric centres. At last, in the future, it will not be enough to cure infantile cancer, but to allow children to live with less sequelae than to day.
Antineoplastic Agents↗