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Central Circuits Inhibiting Skeletal Muscle Shivering
Author(s) -
Morrison Shaun F.,
Conceição Ellen Paula Santos
Publication year - 2019
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.2019.33.1_supplement.559.2
Subject(s) - shivering , hypothalamus , preoptic area , trpm8 , inhibitory postsynaptic potential , skeletal muscle , chemistry , medicine , endocrinology , anesthesia , receptor , transient receptor potential channel , trpv1
Background Skeletal muscle shivering is the most important source of thermogenesis in the human cold‐defensive maintenance of core body temperature (Tcore) and the elevated Tcore during fever. We have described the thermoregulatory reflex pathway through which skin and core cooling, or injection of prostaglandin E2 into the preoptic area of the hypothalamus, leads to activation of skeletal muscle shivering (J Physiol 589.14: 3641–3658, 2011). Here we describe brain regions containing neurons that can provide an inhibitory regulation of shivering. Results EMG activities in masseter, neck and gastrocnemius muscles were recorded in Inactin‐anesthetized rats during cold exposure or injection of PGE2 into the preoptic hypothalamus. Cold‐evoked and febrile shivering EMGs were eliminated by activation of neurons in the ventral part of the lateral preoptic nucleus (vLPO), or by increasing the discharge of neurons in the paraventricular hypothalamus, in the nucleus of the tractus solitarii, or in the ventrolateral medulla. Inhibiting neuronal discharge or blocking glutamate receptors in the vLPO elicited a sustained increase in shivering EMGs in warm rats. Conclusion These results indicate the strong, tonic inhibitory influence of neurons in the vLPO on skeletal muscle shivering, likely through a GABAergic input to shivering premotor neurons in the rostral raphe pallidus. The discovery of the vLPO and other neuronal populations capable of inhibiting shivering supports the potential for the therapeutic control of shivering in the settings of neurogenic fever, brain injury, or induction of hypothermia. Support or Funding Information Supported by NIH grants NS040987 and NS091066 This abstract is from the Experimental Biology 2019 Meeting. There is no full text article associated with this abstract published in The FASEB Journal .