scholarly journals Reduction of Mevalonate Pyrophosphate Decarboxylase in Mouse Melanoma Cells Treated with δ-Tocotrienol Is Not Associated with Reduction of Cholesterol Content or Release of Lysosomes and Melanosomes

2010 ◽  
Vol 56 (3) ◽  
pp. 355-360 ◽  
Author(s):  
Akihiro Michihara ◽  
Mai Shimatani ◽  
Sachiyo Morita ◽  
Kenji Akasaki
Keyword(s):  
Cholesterol Content ◽  
Melanoma Cells ◽  
Mouse Melanoma

scholarly journals Delta-Tocotrienol Causes Decrease of Melanin Content in Mouse Melanoma Cells

2009 ◽  
Vol 55 (2) ◽  
pp. 314-318 ◽  
Author(s):  
Akihiro Michihara ◽  
Sachiyo Morita ◽  
Yae Hirokawa ◽  
Saya Ago ◽  
Kenji Akasaki ◽  
...  
Keyword(s):  
Melanoma Cells ◽  
Melanin Content ◽  
Mouse Melanoma

scholarly journals Novel Chemically Modified Curcumin (CMC) Derivatives Inhibit Tyrosinase Activity and Melanin Synthesis in B16F10 Mouse Melanoma Cells

Biomolecules ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 674
Author(s):  
Shilpi Goenka ◽  
Francis Johnson ◽  
Sanford R. Simon
Keyword(s):  
Enzyme Activity ◽  
Parent Compound ◽  
Radical Scavenging ◽  
Melanoma Cells ◽  
Tyrosinase Activity ◽  
Partial Recovery ◽  
Tyrosinase Inhibitor ◽  
Pyrocatechol Violet ◽  
Mouse Melanoma ◽  
Chemically Modified

Skin hyperpigmentation disorders arise due to excessive production of the macromolecular pigment melanin catalyzed by the enzyme tyrosinase. Recently, the therapeutic use of curcumin for inhibiting tyrosinase activity and production of melanin have been recognized, but poor stability and solubility have limited its use, which has inspired synthesis of curcumin analogs. Here, we investigated four novel chemically modified curcumin (CMC) derivatives (CMC2.14, CMC2.5, CMC2.23 and CMC2.24) and compared them to the parent compound curcumin (PC) for inhibition of in vitro tyrosinase activity using two substrates for monophenolase and diphenolase activities of the enzyme and for diminution of cellular melanogenesis. Enzyme kinetics were analyzed using Lineweaver-Burk and Dixon plots and nonlinear curve-fitting to determine the mechanism for tyrosinase inhibition. Copper chelating activity, using pyrocatechol violet dye indicator assay, and antioxidant activity, using a DPPH radical scavenging assay, were also conducted. Next, the capacity of these derivatives to inhibit tyrosinase-catalyzed melanogenesis was studied in B16F10 mouse melanoma cells and the mechanisms of inhibition were elucidated. Inhibition mechanisms were studied by measuring intracellular tyrosinase activity, cell-free and intracellular α-glucosidase enzyme activity, and effects on MITF protein level and cAMP maturation factor. Our results showed that CMC2.24 showed the greatest efficacy as a tyrosinase inhibitor of all the CMCs and was better than PC as well as a popular tyrosinase inhibitor-kojic acid. Both CMC2.24 and CMC2.23 inhibited tyrosinase enzyme activity by a mixed mode of inhibition with a predominant competitive mode. In addition, CMC2.24 as well as CMC2.23 showed a comparable robust efficacy in inhibiting melanogenesis in cultured melanocytes. Furthermore, after removal of CMC2.24 or CMC2.23 from the medium, we could demonstrate a partial recovery of the suppressed intracellular tyrosinase activity in the melanocytes. Our results provide a proof-of-principle for the novel use of the CMCs that shows them to be far superior to the parent compound, curcumin, for skin depigmentation.

scholarly journals Treatment with Uncaria tomentosa Promotes Apoptosis in B16-BL6 Mouse Melanoma Cells and Inhibits the Growth of B16-BL6 Tumours

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1066
Author(s):  
Ali Zari ◽  
Hajer Alfarteesh ◽  
Carly Buckner ◽  
Robert Lafrenie
Keyword(s):  
Tumour Size ◽  
Melanoma Cells ◽  
Tunel Staining ◽  
Aqueous Extracts ◽  
Ki 67 ◽  
Uncaria Tomentosa ◽  
Mouse Melanoma ◽  
Anti Cancer

Uncaria tomentosa is a medicinal plant native to Peru that has been traditionally used in the treatment of various inflammatory disorders. In this study, the effectiveness of U. tomentosa as an anti-cancer agent was assessed using the growth and survival of B16-BL6 mouse melanoma cells. B16-BL6 cell cultures treated with both ethanol and phosphate-buffered saline (PBS) extracts of U. tomentosa displayed up to 80% lower levels of growth and increased apoptosis compared to vehicle controls. Treatment with ethanolic extracts of Uncaria tomentosa were much more effective than treatment with aqueous extracts. U. tomentosa was also shown to inhibit B16-BL6 cell growth in C57/bl mice in vivo. Mice injected with both the ethanolic and aqueous extracts of U. tomentosa showed a 59 ± 13% decrease in B16-BL6 tumour weight and a 40 ± 9% decrease in tumour size. Histochemical analysis of the B16-BL6 tumours showed a strong reduction in the Ki-67 cell proliferation marker in U. tomentosa-treated mice and a small, but insignificant increase in terminal transferase dUTP nick labelling (TUNEL) staining. Furthermore, U. tomentosa extracts reduced angiogenic markers and reduced the infiltration of T cells into the tumours. Collectively, the results in this study concluded that U. tomentosa has potent anti-cancer activity that significantly inhibited cancer cells in vitro and in vivo.

Stimulation of melanin synthesis of B16-F10 mouse melanoma cells by bufalin

Life Sciences ◽  
1992 ◽  
Vol 51 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Lisha Zhang ◽  
Takemi Yoshida ◽  
Yukio Kuroiwa
Keyword(s):  
Melanoma Cells ◽  
Melanin Synthesis ◽  
Mouse Melanoma ◽  
Stimulation Of

Non-malignant migration of B16 mouse melanoma cells in the neural crest and invasive growth in the eye cup of the chick embryo

2007 ◽  
Vol 17 (1) ◽  
pp. 17-30 ◽  
Author(s):  
Matthias Oppitz ◽  
Christian Busch ◽  
Gernot Schriek ◽  
Marco Metzger ◽  
Lothar Just ◽  
...  
Keyword(s):  
Chick Embryo ◽  
Neural Crest ◽  
Melanoma Cells ◽  
Invasive Growth ◽  
Mouse Melanoma ◽  
B16 Mouse Melanoma

scholarly journals Polydopamine/Transferrin Hybrid Nanoparticles for Targeted Cell-Killing

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1065 ◽  
Author(s):  
Daniel Hauser ◽  
Manuela Estermann ◽  
Ana Milosevic ◽  
Lukas Steinmetz ◽  
Dimitri Vanhecke ◽  
...  
Keyword(s):  
Cell Death ◽  
Biological Function ◽  
Uv Light ◽  
Melanoma Cells ◽  
Hybrid Nanoparticles ◽  
Apoptosis Induction ◽  
Uv Laser ◽  
Lysosomal Membrane Permeabilization ◽  
Mouse Melanoma ◽  
3D Printed

Polydopamine can form biocompatible particles that convert light into heat. Recently, a protocol has been optimized to synthesize polydopamine/protein hybrid nanoparticles that retain the biological function of proteins, and combine it with the stimuli-induced heat generation of polydopamine. We have utilized this novel system to form polydopamine particles, containing transferrin (PDA/Tf). Mouse melanoma cells, which strongly express the transferrin receptor, were exposed to PDA/Tf nanoparticles (NPs) and, subsequently, were irradiated with a UV laser. The cell death rate was monitored in real-time. When irradiated, the melanoma cells exposed to PDA/Tf NPs underwent apoptosis, faster than the control cells, pointing towards the ability of PDA/Tf to mediate UV-light-induced cell death. The system was also validated in an organotypic, 3D-printed tumor spheroid model, comprising mouse melanoma cells, and the exposure and subsequent irradiation with UV-light, yielded similar results to the 2D cell culture. The process of apoptosis was found to be targeted and mediated by the lysosomal membrane permeabilization. Therefore, the herein presented polydopamine/protein NPs constitute a versatile and stable system for cancer cell-targeting and photothermal apoptosis induction.

The analysis of malignancy by cell fusion. VIII. Evidence for the intervention of an extra-chromosomal element

1977 ◽  
Vol 24 (1) ◽  
pp. 255-263
Author(s):  
J. Jonasson ◽  
H. Harris
Keyword(s):  
Human Chromosome ◽  
Gamma Radiation ◽  
Cell Fusion ◽  
Human Fibroblasts ◽  
Melanoma Cells ◽  
Human Chromosomes ◽  
Mouse Melanoma ◽  
Human Diploid Cells ◽  
Diploid Cells ◽  
Hybrid Clones

Diploid human fibroblasts and lymphocytes were fused with the cells of a malignant mouse melanoma and a range of hybrid clones selected for study. The ability of these clones to produce progressive tumours was assayed in nude mice. Although human chromosomes were preferentially eliminated in all the hybrid clones, the human diploid cells were as effective as mouse diploid cells in suppressing the malignancy of the mouse melanoma cells. The suppression produced by fibroblasts was again more profound than that produced by lymphocytes. Malignancy was also found to be suppressed in a hybrid clone in which a single X was the only human chromosome present; and this clone continued to give a very low take incidence even after the human X had been eliminated by back selection. Hybrids were made between the melanoma cells and diploid human fibroblasts that had been given 100 J kg-1 of gamma radiation before cell fusion. These hybrids contained no recognizable human chromosomes, but their ability to produce progressive tumours was greatly reduced compared to that of the melanoma parent cells. The take incidences given by the crosses between the melanoma cells and the irradiated human fibroblasts were, however, substantially higher than those given by the crosses between the melanoma cells and unirradiated fibroblasts. These findings suggest that the suppression of malignancy involves the activity of some extra-chromosomal element and that this element is radio-sensitive.

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