Mechanistic insights into how hunger hormone Ghrelin attenuates pain: Ghrelin, a peptide hormone that regulates appetite, food intake and others, increases the expression of PD-L1, attenuates acute and chronic pain, and suppresses mechanical and thermal hypersensitivity and inhibits nociceptive neuron excitability via up-regulation of its target gene, 14/May/2019, 11.55 pm