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Role of sodium nitroprusside in regulating retinal ganglion cell damage through mitochondrial transcription factor A

Xiao Liu1, Luosheng Tang1, Baihua Chen1

  • 1Department of Ophthalmology, The Second Xiangya hospital of Central South University, No. 139, Ren Min Zhong Road, Changsha 410008, China.

Neuroscience Letters
|October 30, 2016
PubMed

Insights

Nitric oxide (NO) damages mitochondrial DNA and affects retinal ganglion cell (RGC) viability. Mitochondrial transcription factor A (TFAM) plays a key role in regulating these NO-induced effects.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Nitric oxide (NO) is implicated in cellular toxicity, apoptosis, and genotoxicity, particularly damaging mitochondrial DNA (mtDNA).
  • Sodium Nitroprusside (SNP) is a nitric oxide donor used to study NO-related cellular effects.
  • Mitochondrial transcription factor A (TFAM) is crucial for mtDNA maintenance and mitochondrial homeostasis.

Purpose of the Study:

  • To investigate the role of TFAM in regulating retinal ganglion cell (RGC) viability and mtDNA copy numbers under Sodium Nitroprusside (SNP) treatment.
  • To elucidate the mechanism by which TFAM influences SNP-induced cellular changes, focusing on apoptosis-related proteins.

Main Methods:

  • Treatment of RGCs with varying doses of SNP.
  • Assessment of RGC viability and mtDNA copy numbers.
  • Analysis of TFAM expression levels.
  • Manipulation of TFAM expression (overexpression and inhibition).
  • Measurement of apoptosis-related proteins (Bcl-2, Bax) in mitochondria.

Main Results:

  • Low-dose SNP up-regulated TFAM expression, while high-dose SNP down-regulated it.
  • TFAM overexpression mitigated SNP's effects on RGC viability and mtDNA copy number.
  • TFAM inhibition exacerbated SNP's effects on RGC viability and mtDNA copy number.
  • SNP treatment altered the expression of mitochondrial apoptosis regulators Bcl-2 and Bax.

Conclusions:

  • TFAM modulates SNP-induced alterations in RGC viability and mtDNA copy number.
  • The mechanism involves the mitochondria-dependent pathway, mediated by Bcl-2 and Bax subfamily proteins.
  • TFAM is a critical factor in the cellular response to nitric oxide-induced stress.
Keywords:
ApoptosisMitochondrial DNAMitochondrial transcription factor ANitric oxideRetinal ganglion cells

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