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Methylphenidate causes cytotoxicity on photoreceptor cells via autophagy

N Kong1, Y Bao1, H Zhao2

  • 1Department of Ophthalmology, 477093Panyu Central Hospital, Guangzhou, China.

Human & Experimental Toxicology
|August 5, 2020
PubMed

Insights

Methylphenidate (MPH) may harm photoreceptor cells by increasing oxidative stress and inducing autophagy. This research explains the mechanisms behind MPH-induced retinal cell damage, crucial for understanding ADHD treatment side effects.

Area of Science:

  • Ophthalmology
  • Cell Biology
  • Pharmacology

Background:

  • Methylphenidate (MPH) is a primary treatment for attention-deficit hyperactivity disorder (ADHD).
  • Concerns exist regarding potential retinal damage associated with MPH treatment.

Purpose of the Study:

  • To investigate the cytotoxic effects of Methylphenidate (MPH) on photoreceptor cells.
  • To elucidate the underlying molecular mechanisms of MPH-induced retinal cell toxicity.

Main Methods:

  • Utilized 661 W cells to model photoreceptor cells.
  • Assessed cytotoxicity using MTT and lactate dehydrogenase assays.
  • Measured oxidative stress markers, gene expression (RT-PCR), and protein levels (Western Blot).

Main Results:

  • MPH significantly reduced 661 W cell viability and increased apoptosis markers (caspase-3/9).
  • MPH induced oxidative stress, evidenced by altered glutathione (GSH), reactive oxygen species (ROS), and malondialdehyde (MDA) levels.
  • MPH upregulated autophagy markers (Beclin-1 mRNA, LC3B protein) and JAK/STAT signaling pathways (p-JAK1/p-STAT1).

Conclusions:

  • Methylphenidate (MPH) causes photoreceptor cell toxicity through increased oxidative stress and autophagy induction.
  • The study provides a mechanistic basis for MPH-associated retinal damage.
  • Findings highlight potential risks of MPH in ADHD treatment concerning ocular health.
Keywords:
Methylphenidateautophagyoxidative stressphotoreceptor cell

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