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Interferon modulates glucose-sensitive neurons in the hypothalamus
C Reyes-Vazquez1, V Mendoza-Fernandez, M Herrera-Ruiz
1Departmento de Farmacologia, Facultad de Medicina, Universidad Nacional Autónoma de Mexico, Mexico, D.F.
Experimental Brain Research
|February 12, 1998
Summary
Interferon-alpha (IFN) therapy suppresses feeding by altering glucose-sensitive neurons in the hypothalamus. IFN impacts both the lateral hypothalamus (LH) and ventromedial hypothalamus (VMH), leading to anorexia.
Area of Science:
- Neuroscience
- Endocrinology
- Pharmacology
Background:
- Interferon-alpha (IFN) therapy is known to induce feeding suppression, mimicking anorexia.
- Hypothalamic glucose-sensitive neurons play a critical role in regulating feeding behavior.
Purpose of the Study:
- To investigate the interaction between Interferon-alpha (IFN) and glucose-sensitive neurons in the lateral hypothalamus (LH) and ventromedial hypothalamus (VMH).
- To elucidate the neural mechanisms by which IFN therapy may lead to anorexia.
Main Methods:
- Coronal brain sections of rats, including the LH and VMH, were utilized.
- Single-cell recordings were performed to assess neuronal activity.
- The effects of IFN and changes in glucose concentration on neuronal firing were recorded.
Main Results:
- IFN suppressed 78% of LH neurons, while reduced glucose excited 85% of them.
- Conversely, IFN excited 61% of VMH neurons, and reduced glucose had opposite effects in 64%.
- Combined IFN and glucose reduction showed only IFN-specific effects, irrespective of glucose-induced excitation or suppression.
Conclusions:
- Interferon-alpha (IFN) modulates glucose-sensitive neurons in both the LH and VMH.
- These modulations in hypothalamic neuronal activity are a likely mechanism underlying IFN-induced anorexia.