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Hypoglycemia-activated Hypothalamic Microglia Impairs Glucose Counterregulatory Responses
Zsuzsanna Winkler1,2, Dániel Kuti1,2, Ágnes Polyák1
1Laboratory of Molecular Neuroendocrinology, Institute of Experimental Medicine, Budapest, Hungary.
Scientific Reports
|April 19, 2019
Summary
Microglia activation in the hypothalamus disrupts the body's response to low blood sugar (hypoglycemia). Inhibiting microglia improves glucose regulation during this critical stressor.
Area of Science:
- Neuroscience
- Endocrinology
- Immunology
Background:
- Glucose is vital for the central nervous system.
- Hypoglycemia triggers counterregulatory responses initiated by hypothalamic neurons.
- The role of glia, particularly microglia, in these adaptive circuits was unknown.
Purpose of the Study:
- To investigate the involvement of microglia in the hypothalamic control of glucose homeostasis during hypoglycemia.
- To determine the mechanisms by which microglia influence counterregulatory responses.
Main Methods:
- Comparison of fed and fasted male mice, with and without insulin-induced hypoglycemia.
- Administration of minocycline to inhibit microglia.
- Utilizing CX3CR1 knockout mice to study fractalkine signaling.
- Analysis of gene expression (Npy, Agrp, Il-1b) and neuronal activation (IBA1+ microglia).
Main Results:
- Hypoglycemia activated microglia in the hypothalamus, particularly near NPY neurons.
- Microglial inhibition (minocycline) enhanced sympathetic response to hypoglycemia.
- Disruption of CX3CR1 signaling led to exaggerated neuropeptide responses and impaired glucose control.
- IL-1a/b knockout mice showed improved glycemic control during hypoglycemia.
Conclusions:
- Activated microglia in the arcuate nucleus interfere with central counterregulatory responses to hypoglycemia.
- Microglia play a significant role in hypothalamic regulation of glucose homeostasis.
- Targeting microglia may offer therapeutic strategies for managing hypoglycemia.
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