Lysosome as a Chemical Reactor.

Area of Science:

• Cell Biology
• Biochemistry
• Pharmacology

Background:

• Lysosomes are traditionally viewed as simple cellular degradative organelles.
• Emerging evidence highlights the lysosome's complex chemical environment, including its acidic pH, redox activity, and enzyme repertoire.
• This unique environment significantly impacts the disposition and activation of anticancer drugs.

Purpose of the Study:

• To review the chemical features of the lysosome and their influence on anticancer drug fate and activity.
• To explore how lysosomal chemistry can be exploited for novel therapeutic strategies.
• To provide design principles for next-generation anticancer drugs.

Main Methods:

• Literature review of lysosomal chemistry and its role in drug disposition.
• Analysis of lysosomal features such as pH, redox gradients, enzymes, and transporters.
• Examination of emerging therapeutic strategies targeting lysosomal function.

Main Results:

• Lysosomal acidity can trap weak-base drugs or facilitate pH-responsive release.
• Lysosomal redox chemistry, particularly involving metals, generates reactive oxygen species (ROS) contributing to oxidative damage and ferroptosis.
• Lysosomal enzymes and transporters (e.g., P-glycoprotein) modulate drug activation and resistance.

Conclusions:

• The lysosome functions as a chemical microreactor, not just a degradative organelle.
• Targeting lysosomal chemical properties offers opportunities to improve anticancer drug efficacy and overcome resistance.
• Design principles based on lysosomal chemistry can guide the development of more selective and effective cancer therapies.