R492X mutation in PTEN-induced putative kinase 1 induced cellular mitochondrial dysfunction and oxidative stress

Related Experiment Video

Updated: Jun 12, 2026

Assessment of Mitochondrial Functions and Cell Viability in Renal Cells Overexpressing Protein Kinase C Isozymes
15:43

Assessment of Mitochondrial Functions and Cell Viability in Renal Cells Overexpressing Protein Kinase C Isozymes

Published on: January 7, 2013

Xiang-Li Yuan1, Ji-Feng Guo2, Zhen-Hua Shi3

  • 1Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, PR China.

Brain Research
|June 16, 2010
PubMed

Insights

The R492X mutation in PTEN-induced putative kinase 1 (PINK1) causes mitochondrial dysfunction and oxidative stress, contributing to Parkinson's disease pathogenesis. This mutation exacerbates cellular damage, particularly when exposed to MPP(+).

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Rare monogenic forms of Parkinson's disease (PD) offer insights into molecular pathogenesis.
  • Mitochondrial dysfunction and oxidative stress are implicated in PD, but the role of specific mutations remains unclear.

Purpose of the Study:

  • To investigate the effects of the R492X mutation in PTEN-induced putative kinase 1 (PINK1) on cellular function.
  • To understand how this mutation contributes to the molecular mechanisms underlying Parkinson's disease.

Main Methods:

  • Utilized cell cultures to examine wild-type and R492X mutant PINK1.
  • Assessed cellular reactive oxidative species (ROS) generation, mitochondrial membrane potential, and cytochrome C release.
  • Measured mitochondrial complex I activity, and analyzed mitochondrial morphology and numbers, especially after MPP(+) treatment.

Main Results:

  • The R492X PINK1 mutation induced significant ROS generation and mitochondrial membrane potential degradation.
  • Observed cytochrome C release into the cytoplasm and attenuated mitochondrial complex I activity.
  • The mutation led to alterations in mitochondrial number and morphology, potentiated by MPP(+) exposure.

Conclusions:

  • The R492X mutation in PINK1 is a causative factor for mitochondrial dysfunction and oxidative stress.
  • This mutation may contribute to Parkinson's disease onset and progression by impairing mitochondrial function.
  • The combined effect of the R492X mutation and MPP(+) highlights a synergistic mechanism for inducing cellular damage in PD.

More Related Videos

Analyzing Mitochondrial Function in a Drosophila melanogaster PINK1B9-Null Mutant Using High-resolution Respirometry09:20

Analyzing Mitochondrial Function in a Drosophila melanogaster PINK1B9-Null Mutant Using High-resolution Respirometry

Published on: November 10, 2023

Related Concept Videos

Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a rapamycin-insensitive companion...
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
Protein Import into the Peroxisomes01:27

Protein Import into the Peroxisomes

Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...