Effect of lysosomotropic molecules on cellular homeostasis

Omer Kuzu, Mesut Toprak, M. Anwar Noory, Gavin P. Robertson

Research output: Contribution to journalReview article

12 Citations (Scopus)

Abstract

Weak bases that readily penetrate through the lipid bilayer and accumulate inside the acidic organelles are known as lysosomotropic molecules. Many lysosomotropic compounds exhibit therapeutic activity and are commonly used as antidepressant, antipsychotic, antihistamine, or antimalarial agents. Interestingly, studies also have shown increased sensitivity of cancer cells to certain lysosomotropic agents and suggested their mechanism of action as a promising approach for selective destruction of cancer cells. However, their chemotherapeutic utility may be limited due to various side effects. Hence, understanding the homeostatic alterations mediated by lysosomotropic compounds has significant importance for revealing their true therapeutic potential as well as toxicity. In this review, after briefly introducing the concept of lysosomotropism and classifying the lysosomotropic compounds into two major groups according to their cytotoxicity on cancer cells, we focused on the subcellular alterations mediated by class-II lysosomotropic compounds. Briefly, their effect on intracellular cholesterol homeostasis, autophagy and lysosomal sphingolipid metabolism was discussed. Accordingly, class-II lysosomotropic molecules inhibit intracellular cholesterol transport, leading to the accumulation of cholesterol inside the late endosomal-lysosomal cell compartments. However, the accumulated lysosomal cholesterol is invisible to the cellular homeostatic circuits, hence class-II lysosomotropic molecules also upregulate cholesterol synthesis pathway as a downstream event. Considering the fact that Niemann-Pick disease, a lysosomal cholesterol storage disorder, also triggers similar pathologic abnormalities, this review combines the knowledge obtained from the Niemann-Pick studies and lysosomotropic compounds. Taken together, this review is aimed at allowing readers a better understanding of subcellular alterations mediated by lysosomotropic drugs, as well as their potential therapeutic and/or toxic activities.

Original languageEnglish
Pages (from-to)177-184
Number of pages8
JournalPharmacological Research
Volume117
DOIs
Publication statusPublished - 1 Mar 2017
Externally publishedYes

Fingerprint

Homeostasis
Cholesterol
Niemann-Pick Diseases
Neoplasms
Sphingolipids
Poisons
Histamine Antagonists
Autophagy
Antimalarials
Lipid Bilayers
Organelles
Antidepressive Agents
Antipsychotic Agents
Up-Regulation
Therapeutics
Pharmaceutical Preparations

Keywords

  • Antipsychotics
  • Functional inhibitors of acid sphingomyelinase
  • Inhibition of intracellular cholesterol transport
  • Lysosomotropic compounds
  • Lysosomotropism
  • Tricyclic antidepressants

ASJC Scopus subject areas

  • Pharmacology

Cite this

Effect of lysosomotropic molecules on cellular homeostasis. / Kuzu, Omer; Toprak, Mesut; Noory, M. Anwar; Robertson, Gavin P.

In: Pharmacological Research, Vol. 117, 01.03.2017, p. 177-184.

Research output: Contribution to journalReview article

Kuzu, Omer ; Toprak, Mesut ; Noory, M. Anwar ; Robertson, Gavin P. / Effect of lysosomotropic molecules on cellular homeostasis. In: Pharmacological Research. 2017 ; Vol. 117. pp. 177-184.
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