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Related Experiment Video

Updated: Dec 21, 2025

Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease
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[Pargyline and р-Chlorophenylalanine Decrease Expression of Ptpn5 Encoding Striatal-Enriched Protein Tyrosine

E A Kulikova1,2, D V Fursenko1, E Yu Bazhenova1

  • 1Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia.

Molekuliarnaia Biologiia
|May 12, 2020
PubMed
Summary

Altering brain serotonin (5-HT) levels by inhibiting its synthesis or degradation reduced Ptpn5 gene expression in mouse striatum. This study reveals a novel link between the serotonergic system and Ptpn5 regulation.

Keywords:
Ptpn5STEPbrainenzymatic activitygene expressionmousep-chlorophenylalaninepargylineserotoninstriatal-enriched protein tyrosine phosphatase

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Striatal-enriched protein tyrosine phosphatase (STEP) is crucial for neuroplasticity, with abnormalities linked to neurodegenerative disorders.
  • The STEP inhibitor TC-2153 impacts the brain's serotonergic system, but the reverse influence remains unstudied.

Purpose of the Study:

  • To investigate how pharmacologically altered brain serotonin (5-HT) levels affect Ptpn5 gene expression and STEP activity in mice.

Main Methods:

  • Mice received 5-HT synthesis inhibitor (p-chlorophenylalanine) or degradation inhibitor (pargyline) for three days.
  • Serotonin levels were measured using HPLC; STEP activity was assayed spectrophotometrically.
  • Ptpn5 mRNA levels were quantified using RT-PCR.

Main Results:

  • Ptpn5 mRNA expression was significantly higher in the striatum compared to the cortex and hippocampus.
  • Both increased and decreased brain 5-HT levels led to a decrease in striatal Ptpn5 mRNA.
  • Neither p-chlorophenylalanine nor pargyline affected STEP activity in the tested brain regions.

Conclusions:

  • Pharmacological modulation of brain 5-HT levels decreases Ptpn5 mRNA expression in the mouse striatum.
  • A novel method for studying STEP activity in the brain was proposed.
  • The serotonergic system influences Ptpn5 expression, but not directly STEP activity.