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The Colon-26 Carcinoma Tumor-bearing Mouse as a Model for the Study of Cancer Cachexia
Published on: November 30, 2016
A neuroimmune circuit mediates cancer cachexia-associated apathy
Xiaoyue Aelita Zhu1,2, Sarah Starosta1, Miriam Ferrer3
1Department of Neuroscience, Washington University School of Medicine, St. Louis, MO, USA.
Researchers identified a brain circuit linking inflammation to apathy in cachexia. This circuit detects interleukin-6 (IL-6), reducing dopamine and increasing effort sensitivity, offering new therapeutic targets for inflammation-associated depression.
Area of Science:
- Neuroscience
- Immunology
- Oncology
Background:
- Cachexia is a wasting syndrome linked to inflammation, causing multiorgan failure and death.
- Patients exhibit fatigue, apathy, and depression, with unclear biological mechanisms.
- The connection between chronic inflammation and depressive symptoms requires mechanistic understanding.
Purpose of the Study:
- To elucidate the neural mechanisms underlying apathy and effort-sensitivity in cachexia.
- To identify the role of inflammatory cytokines in mediating behavioral symptoms of cachexia.
- To explore therapeutic strategies targeting the identified neural circuit.
Main Methods:
- Utilized a mouse cancer model of cachexia.
- Investigated a brainstem-to-basal ganglia circuit involving cytokine sensing.
- Measured changes in mesolimbic dopamine levels.
- Employed anti-IL-6 antibody treatment, brainstem ablation, and optogenetic/pharmacological dopamine manipulation.
Main Results:
- Cachexia induced increased effort-sensitivity and apathy-like symptoms via a specific neural circuit.
- This circuit detects elevated interleukin-6 (IL-6) and reduces mesolimbic dopamine.
- Targeting circuit nodes (anti-IL-6, brainstem ablation, dopamine boosting) alleviated apathy-like symptoms.
Conclusions:
- A central neural circuit senses systemic inflammation and drives behavioral changes in cachexia.
- This circuit links inflammation to apathy by modulating mesolimbic dopamine.
- Findings provide mechanistic insights into inflammation-induced depressive symptoms and potential therapeutic avenues.
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