Getting Lost in the Cell-Lysosomal Entrapment of Chemotherapeutics

Xingjian Zhai1, Yassine El Hiani1

  • 1Department of Physiology and Biophysics, Faculty of Medicine, Dalhousie University, Halifax, NS B3H 4R2, Canada.

Cancers
|December 10, 2020
PubMed

Insights

Lysosomes help cells adapt to chemotherapy stress, offering a new way to overcome drug resistance by controlling how cancer drugs are stored and removed. This research explores how lysosomes can be targeted to improve cancer treatment.

Area of Science:

  • Oncology
  • Cell Biology
  • Pharmacology

Background:

  • Chemotherapy resistance remains a significant challenge in cancer treatment.
  • Cellular adaptation mechanisms are crucial for understanding and overcoming drug resistance.
  • Lysosomes play a vital role in cellular stress response and adaptation.

Purpose of the Study:

  • To explore the role of lysosomes in cellular adaptation to chemotherapeutic stress.
  • To investigate how lysosomes mediate chemoresistance through drug handling.
  • To present insights into targeting lysosomal functions to circumvent chemotherapy resistance.

Main Methods:

  • Review of existing literature on chemotherapy mechanisms.
  • Analysis of lysosomal adaptive responses to cellular stress.
  • Examination of physiological and pharmacological roles of lysosomes in drug sequestration and clearance.

Main Results:

  • Lysosomes are essential mediators of cellular adaptation under chemotherapeutic challenges.
  • Lysosomal functions such as drug compartmentalization, sequestration, and extracellular clearance are key to chemoresistance.
  • Understanding these lysosomal mechanisms provides a basis for novel therapeutic strategies.

Conclusions:

  • Lysosomes represent a promising target for overcoming chemotherapy resistance.
  • Disrupting aberrant lysosomal processes in cancer cells could enhance treatment efficacy.
  • Further research into lysosome-targeted therapies is warranted for clinical oncology.

Related Concept Videos

Delivery Pathways to the Lysosome01:36

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...
8.5K
Lysosomes01:31

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,...
24.0K
Lysosomal Hydrolases01:22

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,...
4.2K
Mechanisms of Drug Absorption: Paracellular, Transcellular, and Vesicular Transport01:23

Mechanisms of Drug Absorption: Paracellular, Transcellular, and Vesicular Transport

Drugs need to permeate cell membranes to reach their target sites after administration. Orally administered drugs must transcend intestinal epithelial membrane barriers to infiltrate the systemic circulation. Drugs with a molecular weight of less than 500 Daltons diffuse through gaps between neighboring cells, called paracellular pathways.
However, most drugs use the transcellular route, traversing directly through the cell membranes via two mechanisms: passive and active transport. Passive...
1.3K
Treatment Resistant Cancers02:56

Treatment Resistant Cancers

Cancer is the second leading cause of death in the United States. A cancer cell is genetically unstable and hence can mutate faster. They can also modify their microenvironment and escape immune surveillance. The difficulties in treating cancer are further compounded by the emergence of rapid resistance to anticancer drugs. The most common ways to attain resistance in cancer cells include alteration in drug transport and metabolism, modification of drug target, elevated DNA damage response, or...
3.5K
Drug Distribution: Tissue Binding01:21

Drug Distribution: Tissue Binding

Upon entering the systemic circulation, drugs can distribute into the interstitial and intracellular fluid of various tissue cells. This distribution is facilitated by the binding of drugs to different cellular components within tissues, which may lead to drug accumulation in specific areas. Drugs bound to tissue components serve as reservoirs that release free drugs back into the system, prolonging the drug's overall action. However, this accumulation can also result in local toxicity.
For...
3.6K