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Heat stress (HS) is a common stressor that affects all biological systems. Mild to moderate HS is associated with intact baroreflex response which tries to cope up with the stress by maintaining mean arterial pressure (MAP). However, during severe HS, baroreflex response fails leading to fall in MAP which is a pathognomonic feature of heat stroke. Heat stroke can induce neuroinflammation, brain ischemia, oxidative stress and neuronal damage. Increase in ambient temperature led to activation of the thermoregulatory process in Hypothalamus (HTH) and was achieved by rise in nor-epinephrine and fall in serotonin, whereas neurotransmitter imbalance occurred during severe HS in HTH and was associated with expression of inflammatory mediators. Results of our preliminary study also suggested that neuroinflammation was associated with neurotransmitter (monoamines and glutamate) imbalance in HTH leading to thermoregulatory disruption during severe HS. Here, we also discussed that individuals predisposed to factors like chronic inflammation and other complications could decrease the threshold of heat tolerance since a short episode of even sub maximal heat exposure would precipitate the inflammatory cascade leading to thermoregulatory shutdown.

Commentary: Heat stress-induced neuroinflammation and aberration in monoamine levels in hypothalamus are associated with temperature dysregulation