Autophagy Archives - Laboratory Notes

Leucine

admin — Thu, 17 Sep 2026 21:06:17 +0000

Leucine is an essential branched-chain amino acid that supports protein synthesis and muscle metabolism while also acting as a nutrient signal. Explore its roles in mTORC1 signaling, BCAA metabolism, energy metabolism, autophagy, exercise, aging, and metabolic health.

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Branched-Chain Amino Acid

admin — Wed, 02 Sep 2026 19:24:40 +0000

Branched-chain amino acids (BCAAs) are the essential amino acids leucine, isoleucine, and valine. They play important roles in protein synthesis, muscle metabolism, energy production, nutrient sensing, mTOR signaling, nitrogen metabolism, exercise physiology, and metabolic health.

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Protein Ubiquitination

admin — Sun, 30 Aug 2026 10:34:07 +0000

Protein ubiquitination is a fundamental post-translational modification that regulates protein degradation, cellular signaling, DNA repair, autophagy, protein trafficking and cellular homeostasis.

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Programmed Cell Death

admin — Sat, 29 Aug 2026 09:14:14 +0000

Programmed cell death (PCD) is a regulated biological process that eliminates damaged or unnecessary cells through apoptosis, autophagic cell death and regulated necrosis. By maintaining tissue homeostasis and supporting stress adaptation, PCD is essential for development and long‑term organismal health.

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Protein Misfolding

admin — Thu, 27 Aug 2026 18:20:27 +0000

Protein misfolding occurs when proteins fail to achieve or maintain their correct three-dimensional structures. Explore its causes, cellular consequences, quality-control mechanisms, and connection to disease.

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Protein Synthesis and Degradation

admin — Thu, 27 Aug 2026 15:52:23 +0000

Protein homeostasis is the process by which cells maintain a balance between protein synthesis and degradation. This balance is essential for protein quality, cellular function, growth, adaptation, and survival.

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Autophagy

admin — Thu, 27 Aug 2026 14:41:02 +0000

Autophagy is the cell’s built‑in recycling system, removing damaged proteins and organelles to maintain health and survive stress. This article explains how autophagy works, its role in immunity, aging, and disease, and why it is essential for cellular balance.

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Proteostasis Network

admin — Wed, 26 Aug 2026 23:35:50 +0000

The proteostasis network is an integrated system of chaperones, degradation pathways and organelle‑specific quality‑control mechanisms that maintains protein folding, stability and function. By coordinating refolding, repair and degradation, cells prevent proteotoxic stress and preserve homeostasis.

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Cellular Stress Response

admin — Wed, 26 Aug 2026 22:19:52 +0000

Cellular stress responses are adaptive defence mechanisms that protect cells from environmental, metabolic and proteotoxic stress. By activating heat‑shock proteins, unfolded protein responses, antioxidant pathways and autophagy, cells restore homeostasis and maintain functional integrity under adverse conditions.

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Protein Quality Control

admin — Wed, 26 Aug 2026 00:02:22 +0000

Protein quality control (PQC) is a cellular surveillance system that preserves proteome integrity by monitoring protein folding, repairing misfolded proteins and eliminating damaged or aggregated species. Through coordinated action of chaperones, the ubiquitin–proteasome system and autophagy, PQC protects cells from proteotoxic stress and maintains homeostasis.

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TRIM Family

admin — Sun, 23 Aug 2026 20:20:49 +0000

The TRIM family is a large group of single‑chain RING finger ubiquitin ligases that regulate innate immunity, antiviral defence, autophagy, transcription and protein quality control. Defined by their tripartite motif—RING, B‑box and coiled‑coil domains—TRIM proteins use diverse C‑terminal regions to achieve precise substrate specificity. Their roles in immunity, development and cancer make them key regulators of cellular homeostasis.

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K63‑Linked Ubiquitination

admin — Sat, 22 Aug 2026 15:03:04 +0000

K63‑linked ubiquitination is a non‑degradative signalling modification that assembles scaffold‑like ubiquitin chains regulating DNA repair, NF‑κB activation, receptor endocytosis and autophagy. Built by UBE2N/UBE2V1 and specialised E3 ligases, K63 chains coordinate dynamic cellular responses without targeting proteins for proteasomal degradation.

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Premature Ageing

admin — Thu, 20 Aug 2026 19:46:08 +0000

Premature ageing describes the accelerated decline of cellular and physiological functions caused by genomic instability, telomere attrition, mitochondrial dysfunction and chronic inflammation. These processes activate ageing pathways earlier than expected, leading to early onset of tissue deterioration, reduced homeostasis and increased vulnerability to age‑related diseases.

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Ageing

admin — Thu, 20 Aug 2026 19:20:48 +0000

Ageing is a gradual biological process driven by genomic instability, telomere shortening, mitochondrial dysfunction and cellular senescence. These changes reduce physiological resilience, impair tissue repair and increase susceptibility to chronic disease. Understanding the mechanisms of ageing provides insight into longevity, healthspan and the development of age‑related disorders.

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Cellular Responses to Metabolic Stress During Nutrient Deprivation

admin — Thu, 20 Aug 2026 16:00:39 +0000

Nutrient deprivation creates metabolic stress that suppresses mTOR, activates AMPK and induces autophagy. These pathways help cells conserve energy, recycle intracellular components and maintain homeostasis during starvation or limited nutrient availability. Prolonged nutrient deprivation influences gene expression, stress signalling and survival mechanisms across diverse cell types.

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Hydrolytic Enzymes in Cellular Homeostasis and Macromolecule Degradation

admin — Thu, 20 Aug 2026 13:09:47 +0000

Hydrolytic enzymes catalyse the breakdown of macromolecules by adding water to chemical bonds. Found in lysosomes, digestive organs and immune cells, they degrade proteins, nucleic acids, lipids and carbohydrates. Their activity maintains cellular homeostasis, supports nutrient acquisition and protects against pathogens, while dysregulation contributes to metabolic and degenerative diseases.

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Autophagosome

admin — Thu, 20 Aug 2026 12:49:39 +0000

Autophagosomes are double‑membrane vesicles that capture cytoplasmic material for lysosomal degradation. Formed from expanding phagophores and marked by LC3 lipidation, autophagosomes are central to autophagy, enabling cells to recycle nutrients, remove damaged organelles and maintain homeostasis. Their dysfunction contributes to neurodegenerative, metabolic and cancerous diseases.

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Autophagy-Lysosome Pathway

admin — Thu, 13 Aug 2026 13:56:25 +0000

The autophagy-lysosome pathway is the cell's primary degradation and recycling system, responsible for clearing damaged proteins, dysfunctional organelles, and intracellular pathogens. Dysfunction in this pathway has been linked to neurodegenerative disorders, cancer, and metabolic syndromes. This article explores how the process works, its role in disease prevention, and emerging therapeutic strategies targeting this vital cellular mechanism.

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Protein Degradation

admin — Sun, 02 Aug 2026 16:57:52 +0000

Protein degradation is a vital cellular process that removes damaged or unnecessary proteins to maintain homeostasis. This article explains the ubiquitin–proteasome system, autophagy, and their roles in cellular regulation and disease.

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Picric Acid [C6H3N3O7] Molecular Weight Calculation

admin — Wed, 11 Jan 2023 01:20:36 +0000

Picric acid (C6H3N3O7) is an organic compound of four elements: Carbon, Hydrogen, Nitrogen, and Oxygen. The molecular weight of Picric acid is 229.10422 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

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