Nitrobenzoate-Derived Compound X8 Impairs Vascular Development in Zebrafish

Area of Science:

• Developmental Biology
• Vascular Biology
• Pharmacology

Background:

• Proper blood vessel formation is crucial for embryonic development.
• Chemicals can disrupt vascular growth, leading to birth defects.
• Nitrobenzoate derivatives show diverse biological activities.

Purpose of the Study:

• To investigate the effects of a novel nitrobenzoate compound, X8, on vascular development.
• To determine the potential of X8 as an antiangiogenic agent.

Main Methods:

• Zebrafish embryos were exposed to various concentrations of X8 to determine a sublethal dose.
• Transgenic zebrafish were used to assess vascular development, cell proliferation, migration, and apoptosis.
• Gene expression of vascular markers (ephrinb2, mrc1, stabilin) and angiogenesis assays were performed.
• VEGF/VEGFR2 signaling pathway involvement was examined using a VEGFR2 inhibitor.

Main Results:

• X8 treatment at a sublethal dose (3 μM) impaired intersegmental vessel and caudal vein plexus growth.
• Embryos exhibited pericardial edema and circulatory defects, linked to inhibited proliferation and migration.
• X8 decreased the expression of key vascular genes and disrupted angiogenesis.
• X8's vascular defects were exacerbated by a VEGFR2 inhibitor, implicating VEGF/VEGFR2 signaling disruption.

Conclusions:

• X8 significantly inhibits vascular development in zebrafish embryos.
• The mechanism involves reduced cell proliferation, migration, and altered gene expression, particularly via VEGF/VEGFR2 signaling.
• X8 shows promise as a novel antiangiogenic therapeutic agent.