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Systemic inflammation enhances stimulant-induced striatal dopamine elevation.

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  • 1Department of Biomedical Engineering, Yale University, New Haven, CT, USA.

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|March 29, 2017
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Summary
This summary is machine-generated.

Systemic inflammation, induced by lipopolysaccharide (LPS), amplifies dopamine (DA) signaling in the human brain. This immune activation significantly increased methylphenidate-induced DA elevation in the striatum, suggesting a link between inflammation and DA dysfunction in neuropsychiatric disorders.

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Area of Science:

  • Neuroscience
  • Neuroimmunology
  • Psychiatry

Background:

  • Mesolimbic dopamine (DA) system alterations are linked to neuropsychiatric disorders like addiction, depression, and schizophrenia.
  • Neuroimmune system dysfunction frequently co-occurs with these conditions and impacts overlapping brain regions.

Purpose of the Study:

  • To investigate the impact of acute immune activation on striatal DA levels using positron emission tomography (PET).
  • To explore how systemic inflammation affects DA transmission modulation by methylphenidate (MP).

Main Methods:

  • Eight healthy subjects underwent PET scans using the DA D2 antagonist tracer, 11C-raclopride.
  • Subjects received either lipopolysaccharide (LPS) or placebo (PBO) pre-treatment in a cross-over design.
  • DA elevation was assessed via changes in 11C-raclopride binding potential after an oral methylphenidate (MP) challenge.

Main Results:

  • MP-induced DA elevation in the striatum was significantly greater following LPS pre-treatment compared to PBO (P<0.01).
  • This effect was observed in the caudate and putamen but not the ventral striatum.
  • Immune activation was confirmed by elevated plasma levels of TNFα, IL-6, and IL-8.

Conclusions:

  • Acute systemic inflammation significantly amplifies stimulant-induced DA signaling in the human striatum.
  • This finding highlights the critical role of neuroimmune interactions in DA system function.
  • Results have implications for understanding addiction and other DA-related neuropsychiatric disorders.