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Pàgina 1 des de 21 resultats
Immunotherapy with low-dose interleukin-2 in association with melatonin as salvage therapy for metastatic soft tissue sarcomas.
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Polychemotherapy represents the only standard medical therapy of metastatic soft tissue sarcomas (STS), whereas the recent biotherapies with cytokines, such as interleukin-2 (IL-2), seem not to have a relevant therapeutic role. The pineal hormone melatonin (MLT), whose immunomodulating activity is
Synergistic antitumor effect of melatonin with several chemotherapeutic drugs on human Ewing sarcoma cancer cells: potentiation of the extrinsic apoptotic pathway.
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Ewing sarcoma, the second most frequent bone cancer type, affects mainly adolescents, who have a survival of 50% 5 yr after diagnosis. Current treatments include a combination of surgery, radiotherapy and chemotherapy, which present potential serious side effects. Melatonin, a natural molecule
New insights into antimetastatic signaling pathways of melatonin in skeletomuscular sarcoma of childhood and adolescence.
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Melatonin is an indole produced by the pineal gland at night under normal light or dark conditions, and its levels, which are higher in children than in adults, begin to decrease prior to the onset of puberty and continue to decline thereafter. Apart from circadian regulatory actions, melatonin has
Melatonin Cytotoxicity Is Associated to Warburg Effect Inhibition in Ewing Sarcoma Cells.
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Melatonin kills or inhibits the proliferation of different cancer cell types, and this is associated with an increase or a decrease in reactive oxygen species, respectively. Intracellular oxidants originate mainly from oxidative metabolism, and cancer cells frequently show alterations in this
Fas/Fas ligand regulation mediates cell death in human Ewing's sarcoma cells treated with melatonin.
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BACKGROUND
Despite recent advances in cancer therapy, the 5-year survival rate for Ewing's sarcoma is still very low, and new therapeutic approaches are necessary. It was found previously that melatonin induces cell death in the Ewing's sarcoma cell line, SK-N-MC, by activating the extrinsic
Regulation of the expression of death receptors and their ligands by melatonin in haematological cancer cell lines and in leukaemia cells from patients.
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Incorporation of new therapeutic agents remains as a major challenge for treatment of patients with malignant haematological disorders. Melatonin is an indolamine without relevant side effects. It has been shown previously to exhibit synergism with several chemotherapeutic drugs in Ewing sarcoma
Melatonin in cancer patients and in tumor-bearing animals.
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A review of findings is given which relate to the levels of circulating melatonin as well as the urinary excretion of its main peripheral metabolite 6-sulphatoxymelatonin (aMT6s) in patients with different types of cancer as well as in tumor-bearing animals. Clinical results show that circulating
Serial transplants of DMBA-induced mammary tumors in Fischer rats as a model system for human breast cancer. VI. The role of different forms of tumor-associated stress for the regulation of pineal melatonin secretion.
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Previous studies on human breast cancer patients showed a decline in circulating melatonin levels corresponding to primary tumor growth and an increase when relapse occurred. The aim of the current investigation was to study in an experimental model possible mechanisms involved. Inbred female F344
Effects of growing tumours on pineal melatonin levels in male rats.
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The effect of transplantable tumours (Yoshida Sarcoma) on pineal melatonin content was studied in Wistar rats. A negative correlation between pineal melatonin content and size of growing tumours was observed. Effects of chronic treatment with drugs interfering with n=melatonin or serotonin
Characterization of chemically induced ovarian carcinomas in an ethanol-preferring rat model: influence of long-term melatonin treatment.
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Ovarian cancer is the fourth most common cause of cancer deaths among women, and chronic alcoholism may exert co-carcinogenic effects. Because melatonin (mel) has oncostatic properties, we aimed to investigate and characterize the chemical induction of ovarian tumors in a model of ethanol-preferring
Melatonin action in tumor skeletal muscle cells: an ultrastructural study.
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Melatonin (Mel), or N-acetyl-5-methoxytryptamine, is a circadian hormone that can diffuse through all the biological membranes thanks to its amphiphilic structure, also overcoming the blood-brain barrier and placenta. Although Mel has been reported to exhibit strong antioxidant properties in healthy
Serial transplants of DMBA-induced mammary tumors in Fischer rats as model system for human breast cancer. IV. Parallel changes of biopterin and melatonin indicate interactions between the pineal gland and cellular immunity in malignancy.
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Nocturnal (23.00-07.00 h) urinary melatonin and total biopterin (tBI; after acidic oxidation of reduced biopterins) were analyzed during the growth of two passages of a mammary tumor line in female F344 Fischer rats. In addition, nocturnal (02.00-03.00 h) peak concentrations of pineal melatonin in
Influences of light-dark shifting on the immune system, tumor growth and life span of rats, mice and fruit flies as well as on the counteraction of melatonin.
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Animal models were designed to study the changes in immune function, oncogenicity and life span of rats, mice and fruit flies following light-dark (LD) shift manipulations. Alternating the photoperiod of LD 14:10 and DL 10:14 every 3 days in rats disrupted the circadian immune rhythm pattern,
Melatonin decreases cell proliferation, impairs myogenic differentiation and triggers apoptotic cell death in rhabdomyosarcoma cell lines.
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Melatonin is a small indole produced by the pineal gland and other tissues, and has numerous functions that aid in the maintenance of the whole body homeostasis, ranging from the regulation of circadian rhythms and sleep to protection from oxidative stress. Melatonin has also been reported to
Antineoplastic effects of melatonin on a rare malignancy of mesenchymal origin: melatonin receptor-mediated inhibition of signal transduction, linoleic acid metabolism and growth in tissue-isolated human leiomyosarcoma xenografts.
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Melatonin provides a circadian signal that regulates linoleic acid (LA)-dependent tumor growth. In rodent and human cancer xenografts of epithelial origin in vivo, melatonin suppresses the growth-stimulatory effects of linoleic acid (LA) by blocking its uptake and metabolism to the mitogenic agent,
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