Related Experiment Video
Updated: Feb 28, 2026
08:40
Visualization of Endogenous Mitophagy Complexes In Situ in Human Pancreatic Beta Cells Utilizing Proximity Ligation Assay
Published on: May 2, 2019
6.4K
BNIP3L/NIX-dependent mitophagy regulates cell differentiation via metabolic reprogramming.
Lorena Esteban-Martínez1, Patricia Boya1
1a Department of Cellular and Molecular Biology , Centro de Investigaciones Biológicas, CSIC , Madrid , Spain.
Autophagy
|June 15, 2017
Summary
Cellular mitophagy, or mitochondria removal, is crucial for retinal ganglion cell development. This process, driven by hypoxia and BNIP3L/NIX, shifts metabolism to glycolysis, regulating cell numbers and inflammation.
Area of Science:
- Cell Biology
- Neuroscience
- Metabolism
Background:
- Macroautophagy/autophagy degrades cellular components via lysosomes.
- Mitophagy selectively removes mitochondria, essential for cellular adaptation.
- Cell differentiation involves metabolic shifts, often increasing mitochondrial activity.
Purpose of the Study:
- Investigate the role of mitophagy in retinal ganglion cell (RGC) development.
- Determine the molecular mechanisms linking hypoxia, mitophagy, and metabolic reprogramming in RGCs.
- Explore the impact of mitophagy on macrophage polarization during inflammation.
Main Methods:
- Studied RGC development in vivo.
- Analyzed tissue hypoxia and HIF1A/HIF-1 stabilization.
- Assessed expression of the mitophagy receptor BNIP3L/NIX.
- Examined metabolic shifts towards glycolysis.
- Investigated macrophage polarization.
Main Results:
- Physiologic RGC development relies on mitophagy-dependent metabolic reprogramming toward glycolysis.
- Tissue hypoxia triggers HIF1A/HIF-1 stabilization and BNIP3L/NIX expression during retinal development.
- BNIP3L-dependent mitophagy drives a metabolic shift to glycolysis, essential for RGC neurogenesis.
- BNIP3L-dependent mitophagy regulates proinflammatory/M1 macrophage polarization.
Conclusions:
- Hypoxia, mitophagy, and metabolic reprogramming are interconnected in the differentiation of multiple cell types.
- Mitophagy plays a critical role in regulating RGC numbers during development.
- This pathway influences inflammatory responses via macrophage polarization.
- Findings suggest implications for neurodegenerative and metabolic diseases.
Related Concept Videos
01:28Biosynthesis of Nucleic Acids
1.3K
Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
1.3K
01:19Translocation of Proteins into the Mitochondria
13.5K
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,...
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,...
13.5K
01:29Somatic to iPS Cell Reprogramming
2.7K
Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
2.7K
01:32Chromatin Modification in iPS Cells
2.2K
Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
2.2K
01:22iPS Cell Differentiation
3.2K
The ability of induced pluripotent stem cells or iPSCs to differentiate into most body cell types has stimulated repair and regenerative medicine research over the past few decades. iPSC-derived blood cells, hepatocytes, beta islet cells, cardiomyocytes, neurons, and other cell types can repair injuries or regenerate damaged tissue in diseases such as diabetes and neurodegenerative disorders.
3.2K
02:36Cells Coordinate Growth and Proliferation
5.2K
Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
5.2K