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Sensitization to Amphetamine

Implication of Inter-individual Differences

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Handbook of Substance Misuse and Addictions
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Abstract

Repeated, intermittent administration of amphetamine or amphetamine derivatives leads to sensitization to the effects of the drug, expressed as heightened locomotor response or operant responding, but also higher self-administration of the drug and emission of 50-kHz ultrasonic vocalizations (USVs). Sensitization appears after a drug-free period and is persistent. The development of sensitization is associated with increased response of the dopamine neurons of the ventral tegmental area; expression of sensitization depends on enhanced dopamine release in the nucleus accumbens. During sensitization, further alterations occur in extended neural circuits involving medial prefrontal cortex, amygdala, pallidum, and hippocampus and contribute to the expression of enhanced response. Sensitization is context-dependent: Previously neutral stimuli, while associated with the pharmacological drug effect, acquire incentive salience and guide future behavior, including self-administration of the drug. Cross-sensitization occurs between amphetamine and other addictive substances and between amphetamine and stress. Sensitization to amphetamine has direct relevance to understanding of the neurobiology of such psychiatric conditions as schizophrenia and addiction.

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Abbreviations

AMPA:

α-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid

BDNF:

Brain-derived neurotrophic factor

BOLD:

Blood oxygen level dependent

CREB:

cAMP response element-binding protein

DSP-4:

N-(2-chloroethyl)-N-ethyl-2-bromobenzylamine

fMRI:

Functional magnetic resonance imaging

GABA:

Gamma-aminobutyric acid

GAD67:

The major isoform of glutamate decarboxylase

HE:

High-exploring rats

HR:

High-responding rats

LE:

Low-exploring rats

LR:

Low-responding rats

PET:

Positron emission tomography

STAT3:

Signal transducer and activator of transcription 3

trkB:

Tropomyosin/tyrosine receptor kinase B

USV:

Ultrasonic vocalization

VTA:

Ventral tegmental area

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Acknowledgments

Relevant research of the authors was supported by the Estonian Research Council (PRG1213).

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Correspondence to Jaanus Harro .

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Harro, J., O’Leary, A. (2022). Sensitization to Amphetamine. In: Patel, V.B., Preedy, V.R. (eds) Handbook of Substance Misuse and Addictions. Springer, Cham. https://doi.org/10.1007/978-3-030-92392-1_108

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