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Alteration of brain catecholamines during growth of benzo(a)pyrene induced murine fibrosarcoma
1Department of Endocrinology, Chittaranjan National Cancer Institute (Research Centre), Calcutta, India.
Abstract:
Brain catecholamines (CA) were studied in discrete brain areas of benzo(a)pyrene (b(a)p) induced fibrosarcoma bearing mice. Dopamine (DA) and norepinephrine (NE) levels decreased significantly in different brain areas especially in corpus striatum and hypothalamus with the tumor progression, indicating an inverse relationship between brain DA and NE levels and tumor growth. Since impaired hormonal and immunological functions are manifestation of systemic alteration during tumor growth, it appears that during malignant growth an alteration of these brain CA may play an important role in the regulation of systemic alterations.
Insights
Brain catecholamines, including dopamine and norepinephrine, decrease as fibrosarcoma tumors grow in mice. This inverse relationship suggests a role for these neurotransmitters in regulating systemic changes during cancer progression.
Area of Science:
- Neuroscience
- Oncology
- Biochemistry
Background:
- Benzo(a)pyrene (BaP) is a known carcinogen that can induce fibrosarcoma in experimental models.
- Cancer progression is associated with systemic alterations, including potential neurochemical changes.
- Brain catecholamines (CA) play crucial roles in regulating various physiological functions.
Purpose of the Study:
- To investigate the changes in brain catecholamine levels in mice bearing benzo(a)pyrene-induced fibrosarcoma.
- To explore the relationship between tumor progression and catecholamine concentrations in specific brain regions.
Main Methods:
- Fibrosarcoma was induced in mice using benzo(a)pyrene.
- Catecholamine levels (dopamine and norepinephrine) were measured in discrete brain areas.
- Brain tissue analysis was performed at different stages of tumor progression.
Main Results:
- A significant decrease in dopamine (DA) and norepinephrine (NE) levels was observed in various brain areas.
- The most pronounced decreases in DA and NE were noted in the corpus striatum and hypothalamus.
- An inverse correlation was found between brain DA/NE levels and tumor growth, with levels declining as tumors progressed.
Conclusions:
- Tumor progression in fibrosarcoma-bearing mice is associated with significant alterations in brain catecholamine levels.
- The observed decrease in brain dopamine and norepinephrine suggests their potential involvement in regulating systemic changes during malignant growth.
- These findings highlight a possible link between neurochemical changes and the systemic manifestations of cancer.