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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,...

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Lysosomal reduced thiols are essential for mouse embryonic development.

Charles H Adelmann, Avanthika Venkatachalam, Lingjuan Huang

Biorxiv : the Preprint Server for Biology

|January 7, 2025

Summary

Mice lacking the MFSD12 protein, essential for lysosomal cysteine import, die during organogenesis. Supplying reduced cysteine via cysteamine rescues these mice, revealing lysosomal thiol import as a critical metabolic pathway.

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Area of Science:

Cell Biology
Developmental Biology
Metabolic Biochemistry

Background:

Lysosomes are known to import cysteine, but its physiological importance remains unclear.
The transmembrane protein MFSD12 is recently identified as crucial for cysteine import into lysosomes and melanosomes.
Understanding lysosomal cysteine metabolism is vital for comprehending cellular and organismal health.

Purpose of the Study:

To investigate the essential role of MFSD12 in organismal physiology and development.
To elucidate the specific function of MFSD12 in lysosomal cysteine import.
To explore the therapeutic potential of modulating lysosomal thiol levels.

Main Methods:

Utilizing knockout mouse models lacking the Mfsd12 gene.
Analyzing embryonic lethality and developmental defects in Mfsd12-deficient mice.
Employing pharmacological interventions, such as cysteamine treatment, to rescue developmental phenotypes.

Main Results:

Mice lacking Mfsd12 exhibit embryonic lethality between days 10.5-12.5, indicating MFSD12's essential role in organogenesis.
Loss of CTNS (cystinosin), a lysosomal cystine exporter, does not cause lethality, suggesting MFSD12's function is not solely cystine export.
Cysteamine treatment rescues Mfsd12 knockout mice, enabling live births and highlighting the importance of reduced cysteine supply.

Conclusions:

MFSD12-mediated lysosomal thiol import is an essential metabolic pathway critical for embryonic development.
The primary role of MFSD12 is likely to supply reduced cysteine to the lysosomal lumen, not just to facilitate cystine storage.
This study provides novel insights into lysosomal metabolism and offers potential therapeutic strategies for related disorders.