Note: based on a RGCC chemosensitivity analysis I have seen at a German clinic, Hydroxychloroquine has been effective in killing the cancer cells of 5 out 7 patients that were tested. It is one of very few available drugs that inhibits autophagy, a mechanism associated with its anticancer properties. Hydroxychloroquine and ldn Plaquenil urticaria schnitzler syndrome Freshly isolated embryonic chick tendon fibroblasts were incubated in suspension culture for six hrs in the presence or absence of ammonium chloride or chloroquine. Both agents caused a marked reduction in collagen production without inhibiting non-collagen protein synthesis. Such substances are referred to as lysosomotropic agents, and via this mechanism, trapped substances may accumulate to concentrations hundredfold that of the cytosolic concentration 22 Figure 1. Several well-known drugs used in the clinic have documented lysosomotropic abilities including the antimalarial drug chloroquine, several Lysosomotropic agents e.g. chloroquine, accumulate preferentially in the lysosomes of cells in the body. These agents tend to have both lipophilic or amphiphilic compounds with basic moieties. Once inside the acidic environment of the lysosome, the drug becomes protonated and trapped in the organelle 2. In cancer, authophagy is the process used by cancer cells to “self-eat” in order to survive. Specifically, if authophagy is prolonged this will become a lethal process to cancer. duing chemotheraphy, radiotheraphy, etc.) authophagy is used by cancer cells to survive. However, note that Chloroquine has other properties as well that may be very well related to anti cancer mechanism, such as zinc ionophore, and others (see below the section on mechanisms). Lysosomotropic agent chloroquine CST - Chloroquine, Lysosomotropic agents impact on lysosomal membrane. Plaquenil for autoimmune disordersLupus medications plaquenilPlaquenil excretion Furthermore, this report addresses a long-standing question regarding the mechanism of chloroquine, a lysosomotropic agent often used to interrogate effects of autophagy inhibition. Although chloroquine is antiproliferative and synergizes with targeted anticancer drugs, these effects are independent of macroautophagy. Macroautophagy is dispensable for growth of KRAS mutant.. Lysosomal Trapping Lysosomotropism Assay. Enhanced plasmid DNA transfection with lysosomotropic agents.. Haploid cells of opposite mating type of Saccharomyces cerevisiae conjugate to form zygote. During the conjugation process, the degradation or reorganization of the cell wall and the fusion of the two plasma membranes take place. Since chloroquine inhibits cellular events associated with the reorganization of the plasma membrane, the effect of the drug on conjugation was studied. Chloroquine. Dec 02, 2016 In this study, we aimed to investigate the influence of lysosomotropic agent, chloroquine, on the efficacy of obinutuzumab-mediated cytotoxicity. As PCD is dependent on lysosomal destabilization, we hypothesized that combination of obinutuzumab with lysosome-destabilizing agent would result in increased cell death. Treatment of cells with the macrolide antibiotic bafilomycin A1, an inhibitor of vacuolar V-ATPase, or with the lysosomotropic agent chloroquine, has been shown to pharmacologically inhibit autophagy as evidenced by an accumulation of autophagosomes, which in turn causes Bax-dependent apoptosis. However, bafilomycin A1 has also been reported to inhibit chloroquine-induced apoptosis.