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Related Concept Videos

Autophagy01:27

Autophagy

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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
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Delivery Pathways to the Lysosome01:36

Delivery Pathways to the Lysosome

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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
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Autophagic Cell Death01:18

Autophagic Cell Death

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Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
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Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and...
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Abnormal Proliferation02:23

Abnormal Proliferation

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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...
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The Intrinsic Apoptotic Pathway01:31

The Intrinsic Apoptotic Pathway

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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

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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...
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Related Experiment Video

Updated: Mar 19, 2026

siRNA Electroporation to Modulate Autophagy in Herpes Simplex Virus Type 1-Infected Monocyte-Derived Dendritic Cells
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siRNA Electroporation to Modulate Autophagy in Herpes Simplex Virus Type 1-Infected Monocyte-Derived Dendritic Cells

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p32: A new player in autophagy.

Haifeng Jiao1, Han You1

  • 1State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University , Xiamen, Fujian, China.

Molecular & Cellular Oncology
|June 18, 2016
PubMed
Summary

p32 protein is vital for initiating autophagy and clearing damaged mitochondria by controlling Ulk1 activity. This highlights p32

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Autophagy Research

Background:

  • Unc-51 like kinase-1 (Ulk1) is a key regulator of autophagy induction.
  • Autophagy is crucial for cellular homeostasis and stress response.
  • Mitochondrial quality control is essential for cell survival.

Purpose of the Study:

  • To investigate the role of p32/C1QBP in autophagy induction and mitochondrial clearance.
  • To elucidate the mechanism by which p32 regulates Ulk1.
  • To understand p32's contribution to cellular stress response and mitochondrial homeostasis.

Main Methods:

  • Western blotting to assess protein levels and activity.
  • Immunoprecipitation to study protein interactions.
  • Autophagy assays to measure autophagic flux.
Keywords:
Autophagy; p32; ULK1

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  • Mitochondrial assays to evaluate mitochondrial health.

    • Main Results:

    • p32/C1QBP is crucial for inducing autophagic flux upon starvation.
    • p32 regulates Ulk1 stability and kinase activity.
    • p32 facilitates the clearance of damaged mitochondria.
    • p32 plays a significant role in fine-tuning the cellular stress response.

    Conclusions:

    • p32 is essential for efficient autophagy and mitochondrial clearance.
    • p32 acts by modulating Ulk1 activity and stability.
    • p32 is a critical factor in maintaining mitochondrial homeostasis during stress.