Wenn man bei Medline mit den zwei Suchbegriffen >melatonin glioblastoma< sucht, dann kommt man auch auf diesen Artikel. Hier wird darüber nachgedacht bzw. experimentiert, welche Schutzfunktion Melatonin auf die gesunden Zellen ausübt.
Chin Med Sci J. 2000 Mar;15(1):40-4. Protective effect of melatonin on neural cells against the cytotoxicity of oxyradicals.An Y, Liu E, Liu X, Yang F, Han F, Dai Q.
Department of Neurosurgery, First Affiliated Hospital of Harbin Medical University, Harbin 150001.
OBJECTIVE: To investigate the exact mechanism of melatonin to prohibit the apoptosis of neural cells induced by various kinds of cytotoxic agents. METHODS: We used the methods of phase contrast microscopy, MTT assay and hoechst dye staining to check this mechanism in SKNSH and U251 cell lines. RESULTS: Both 2 mmol/L H2O2 and 0.5 micromol/L amyloid beta-protein (Abeta) induce these two cell lines die via apoptosis. Either melatonin or glutathione can significantly protect both cell lines. The protective effect of 10 micromol/L melatonin is as same as that of 60 micromol/L glutathione. CONCLUSION: Melatonin can partly inhibit the cytotoxicity of H2O2 and Abeta through its role as a free radical scavenger.
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Am J Hosp Palliat Care. 2005 Jul-Aug;22(4):295-309
The therapeutic application of melatonin in supportive care and palliative medicine.
Mahmoud F, Sarhill N, Mazurczak MA.
Department of Internal Medicine, University of South Dakota, Sioux Falls, South Dakota, USA.
Melatonin is a hormone produced mainly in the pineal gland. Plasma levels exhibit a circadian variation with the highest concentration occurring at night. The human biologic effects of melatonin depend upon the time of day it is made available. One of these effects is the setting and resetting of circadian clocks (chronobiotic effect). Additionally, it may be a potent antioxidant and immunomodulator and has been shown to have antitumor, anticytokine, anti-insomnia, and anticachexia effects. Melatonin has also been shown to improve survival and performance status in patients with advanced cancer. Objective tumor response occurs with melatonin alone or when combined with interleukin-2 (IL-2). Further, melatonin reduces radiation- and chemotherapeutic-induced toxicity. Symptomatic and circadian disruption is linked to increased cancer risk. The chronobiotic capacity of melatonin to reset circadian clocks may provide a verifiable strategy to reduce cancer risk and enhance quality of life by diminishing cancer-induced circadian disruption.
Was das Tamoxifen anbetrifft, da sieht es nicht günstig aus. Tamoxifen scheint die Wahrscheinlichkeit eines Rezidivs zu erhöhen!
Anticancer Res. 2004 Nov-Dec;24(6):4195-203.High-dose tamoxifen treatment increases the incidence of multifocal tumor recurrences in glioblastoma patients.Puchner MJ, Giese A, Lohmann F, Cristante L.
Department of Neurosurgery, Gilead Hospital, Bielefeld, Germany.
Maximilian.Puchner@evkb.deBACKGROUND: Multifocal tumor recurrences in glioblastoma patients are described in 4% - 14% of cases. Two recent studies, treating newly diagnosed glioblastoma patients with continuous high-dose tamoxifen (TAM), reported an increased incidence of multifocal tumor recurrences in 45.5% and 33% of study patients. PATIENTS AND METHODS: Fifty newly diagnosed patients with glioblastoma were treated with 3 cycles of carboplatin, continuous high-dose TAM and radiotherapy. Tumor progression was determined on follow-up MRI studies at 3-month intervals and categorized as either local or multifocal. RESULTS: Multifocal tumor recurrence was found in 16 (33%) out of 49 study patients. Compared to tumors which remained local, multifocal tumor recurrences were characterized by a significantly longer median time to tumor progression (41 vs. 23 weeks, Breslow test: p = 0.0123). Multifocal tumor recurrences were mainly observed after an initial response to the study treatment (81%), whereas local regrowth was more often associated with initial treatment failure, i.e. progressive disease (64%). CONCLUSION: The association of the pattern of tumor recurrence with the type of response to TAM treatment suggests that acquired resistance to TAM might be an important contributing mechanism in the development of multifocal glioblastoma disease.