Social stress, therapeutics and drug abuse: preclinical models of escalated and depressed intake.
The impact of ostensibly aversive social stresses on triggering, amplifying and prolonging intensely rewarding drug taking is an apparent contradiction in need of resolution. Social stress encompasses various types of significant life events ranging from maternal separation stress, brief episodes of social confrontations in adolescence and adulthood, to continuous subordination stress, each with its own behavioral and physiological profile. The neural circuit comprising the VTA-accumbens-PFC-amygdala is activated by brief episodes of social stress, which is critical for the DA-mediated behavioral sensitization and increased stimulant consumption. A second neural circuit comprising the raphe-PFC-hippocampus is activated by continuous subordination stress and other types of uncontrollable stress. In terms of the development of therapeutics, brief maternal separation stress has proven useful in characterizing compounds acting on subtypes of GABA, glutamate, serotonin and opioid receptors with anxiolytic potential. While large increases in alcohol and cocaine intake during adulthood have been seen after prolonged maternal separation experiences during the first two weeks of rodent life, these effects may be modulated by additional yet to be identified factors. Brief episodes of defeat stress can engender behavioral sensitization that is relevant to escalated and prolonged self-administration of stimulants and possibly opioids, whereas continuous subordination stress leads to anhedonia-like effects. Understanding the intracellular cascade of events for the transition from episodic to continuous social stress in infancy and adulthood may provide insight into the modulation of basic reward processes that are critical for addictive and affective disorders.
Miczek
Klaus A
KA
Departments of Psychology, Psychiatry, Pharmacology and Neuroscience, Tufts University, Medford and Boston, MA 02155, United States. klaus.miczek@tufts.edu
Yap
Jasmine J
JJ
Covington
Herbert E
HE
D000293:Adolescent; D000328:Adult; D000818:Animals; D004298:Dopamine / Q000378:metabolism; D006801:Humans; D008426:Maternal Deprivation; D023421:Models, Animal; D008954:Models, Biological; D012201:Reward; D012646:Self Administration; D013315:Stress, Psychological / Q000503:physiopathology*; D019966:Substance-Related Disorders / Q000523:psychology*
D004298:Dopamine
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