Doxycycline influences microcirculation patterns in B16 melanoma.

Area of Science:

• Oncology
• Pharmacology
• Molecular Biology

Background:

• Melanoma is an aggressive skin cancer with a high potential for metastasis.
• Matrix metalloproteinases (MMPs) and vasculogenic mimicry (VM) are critical factors in melanoma invasion and angiogenesis.
• Doxycycline, a tetracycline antibiotic, has demonstrated anti-cancer properties.

Purpose of the Study:

• To investigate the effects of doxycycline on melanoma cell invasion, proliferation, and microcirculation.
• To analyze the impact of doxycycline on the expression and activity of key proteins involved in melanoma progression, including MMP-2, MMP-9, VEGF, and PCNA.

Main Methods:

• Murine melanoma B16 cells were injected into C57BL/6 mice, which were then treated with doxycycline or saline.
• Tumor growth, vascularization (VM and endothelium-dependent vessels), and protein expression (MMP-2, MMP-9, VEGF, PCNA) were assessed.
• Gelatin zymography and real-time PCR were used to evaluate MMP activity and mRNA levels.

Main Results:

• Doxycycline treatment inhibited B16 melanoma growth by 35.63%.
• Fewer VM and endothelium-dependent vessels were observed in the doxycycline-treated group.
• Doxycycline significantly reduced MMP-2 and MMP-9 expression and activity at both protein and mRNA levels.
• Vascular endothelial growth factor (VEGF) expression increased with doxycycline treatment.

Conclusions:

• Doxycycline effectively inhibits the growth of engrafted melanoma in mice.
• The anti-melanoma effects of doxycycline are associated with reduced expression and activity of MMP-2 and MMP-9, and decreased VM formation.
• Doxycycline represents a potential therapeutic agent for melanoma, warranting further investigation.