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Pmel17 Deficiency Affects Melanogenesis and Promotes Tumor Vascularization
Justyna Sopel1,2, Katarzyna Sarad2,3, Anna Kozinska1
1Department of Biophysics and Cancer Biology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Krakow, Poland.
Abstract:
Premelanosomal protein (Pmel, also known as Pmel17) is the major component of melanosomal fibrils and plays a key role in melanin polymerization, making it an important factor in melanogenesis. We investigated how the absence of Pmel affects the properties of B16F10 melanoma cells. Pmel-knockout B16F10 cells were generated using CRISPR/Cas9-mediated genome editing. A viability assay revealed no significant differences between wild-type (WT) and Pmel-knockout (KO) sublines; however, melanosome maturation was impaired. In Pmel KO cells, the cell cycle was disrupted, and higher levels of reactive oxygen species (ROS) were observed compared with WT cells. Moreover, the migration capacity and tube formation of melanoma cells were increased. Tumors derived from Pmel KO cells exhibited unchanged growth kinetics but reduced melanin content, along with enhanced vascularization and oxygenation. Thus, knockout of the Pmel17 gene in melanoma cells alters pigmentation, vascularization, and oxygenation of tumors. These parameters are crucial for both tumor progression and therapeutic response.
Insights
The absence of premelanosomal protein (Pmel) in melanoma cells impairs melanosome maturation and increases reactive oxygen species. Pmel knockout alters tumor pigmentation, vascularization, and oxygenation, impacting tumor progression and treatment response.
Area of Science:
- Biochemistry
- Cell Biology
- Oncology
Background:
- Premelanosomal protein (Pmel, also known as Pmel17) is essential for melanin production and melanosome structure.
- Melanogenesis is a complex process involving melanosome formation and melanin polymerization.
- Understanding Pmel's role is crucial for melanoma research and therapeutic development.
Purpose of the Study:
- To investigate the functional consequences of Pmel absence in B16F10 melanoma cells.
- To determine how Pmel knockout affects melanoma cell properties and tumor characteristics.
- To assess the impact of Pmel on tumor pigmentation, vascularization, and oxygenation.
Main Methods:
- CRISPR/Cas9 genome editing was used to generate Pmel-knockout (KO) B16F10 melanoma cells.
- Cell viability assays were performed to compare wild-type (WT) and KO cells.
- Analysis included melanosome maturation, cell cycle, reactive oxygen species (ROS) levels, migration, and tube formation.
Main Results:
- Pmel KO cells showed impaired melanosome maturation and disrupted cell cycle.
- Increased reactive oxygen species (ROS) levels were observed in Pmel KO cells.
- Pmel KO melanoma cells exhibited enhanced migration and tube formation, with tumors showing reduced melanin but increased vascularization and oxygenation.
Conclusions:
- Pmel knockout significantly alters melanoma cell behavior and tumor microenvironment.
- Loss of Pmel impacts pigmentation, vascularization, and oxygenation, which are critical for tumor progression.
- These findings highlight Pmel's multifaceted role in melanoma and its potential as a therapeutic target.
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