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Lysosomal Hydrolases

Lysosomal Hydrolases

Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...

Lysosomes

Lysosomes

Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...

Lysosomes

Lysosomes

Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...

Delivery Pathways to the Lysosome

Delivery Pathways to the Lysosome

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...

Maturation of Endosomes

Maturation of Endosomes

The early endosome containing internalized molecules matures through transformations in its location, morphology, intraluminal pH, and membrane protein composition. Together, these changes result in a more acidic late endosome that contains multiple intraluminal vesicles; therefore, the late endosome is also called a multivesicular body (MVB).
Changes in location
The maturing endosome moves along microtubules from the periphery of the cell towards the perinuclear region. This movement of the...

Autophagy

Autophagy

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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Related Experiment Video

Updated: Jul 17, 2026

Assessing Lysosomal Alkalinization in the Intestine of Live Caenorhabditis elegans

Assessing Lysosomal Alkalinization in the Intestine of Live Caenorhabditis elegans

Published on: April 13, 2018

Lysosomes and lysosomal dysfunction in ageing biology.

Matthew L Steinhauser^1,2,3, Yuan Liu^4,5, Stacey J Sukoff Rizzo^6,7

¹Aging Institute, University of Pittsburgh School of Medicine and University of Pittsburgh Medical Center, Pittsburgh, PA, USA. msteinhauser@pitt.edu.

Nature Cell Biology

|July 15, 2026

Summary

Lysosomes, crucial for cell balance, become dysfunctional during aging, impairing cellular cleanup and driving age-related diseases. Targeting lysosomes offers a promising strategy for healthy aging and disease prevention.

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Dual-color Correlative Light and Electron Microscopy for the Visualization of Interactions between Mitochondria and Lysosomes

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Measurement of Protein Turnover Rates in Senescent and Non-Dividing Cultured Cells with Metabolic Labeling and Mass Spectrometry

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Dual-color Correlative Light and Electron Microscopy for the Visualization of Interactions between Mitochondria and Lysosomes

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Published on: September 27, 2024

Area of Science:

Cell Biology
Aging Research
Molecular Biology

Background:

Lysosomes maintain cellular homeostasis.
Lysosomes are implicated as both targets and drivers of aging.
Lysosomal dysfunction is a hallmark of aging.

Purpose of the Study:

Review recent advances in lysosomal biogenesis and quality control.
Discuss the intersection of lysosomal function with aging mechanisms.
Evaluate therapeutic strategies targeting lysosomes for healthy aging.

Main Methods:

Literature review of lysosomal function in aging.
Analysis of molecular mechanisms linking lysosomal defects to aging.
Evaluation of therapeutic interventions targeting lysosomal pathways.

Main Results:

Aging impairs lysosome function (biogenesis, acidification, activity, integrity).
Lysosomal defects lead to reduced clearance of cellular waste, promoting inflammaging and senescence.
Lysosomal dysfunction is linked to neurodegeneration, cardiometabolic disorders, and infections.

Conclusions:

Lysosomal dysfunction is a key driver of age-related pathologies.
Therapeutic strategies targeting lysosomes hold potential for promoting healthy aging.
Further research into lysosomal mechanisms can reveal new avenues for combating age-associated diseases.