CEACAM1/VEGF cross-talk during neuroblastic tumour differentiation.

Area of Science:

• Oncology
• Developmental Biology
• Cell Biology

Background:

• Angiogenesis, the formation of new blood vessels, is crucial in tumor progression and linked to poor outcomes in neuroblastomas.
• The role of angiogenesis during the maturation phase of neuroblastic tumors remains underexplored.
• Human carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) is a pro-angiogenic factor involved in vascular endothelial growth factor (VEGF)-induced angiogenesis.

Purpose of the Study:

• To investigate the role of CEACAM1/VEGF-mediated angiogenesis throughout the spectrum of neuroblastic tumor maturation.
• To compare angiogenic mechanisms in differentiating versus undifferentiated neuroblastic tumors.
• To elucidate the potential mimicry of physiological central nervous system vascular development by tumor maturation processes.

Main Methods:

• Examined CEACAM1 expression in microvessels across various neuroblastic tumor differentiation stages.
• Assessed VEGF expression in differentiating neuroblastic/ganglion cells and in vitro cell models (SH-SY5Y).
• Utilized conditioned media from differentiating SH-SY5Y cells to study CEACAM1 upregulation in human umbilical vein endothelial cells (HUVECs), employing a VEGF receptor-2 inhibitor (SU5416).

Main Results:

• CEACAM1 was specifically expressed in microvessels of actively maturing neuroblastic areas, but absent in undifferentiated or fully mature Schwannian-rich areas.
• VEGF expression was detected in differentiating neuroblastic/ganglion cells adjacent to CEACAM1-positive microvessels.
• In vitro, differentiating SH-SY5Y cells induced CEACAM1 expression in HUVECs, dependent on VEGF signaling, which was blocked by SU5416.

Conclusions:

• A CEACAM1/VEGF cross-talk is implicated in the maturation phase of neuroblastic tumors, potentially mirroring physiological vascular development in the CNS.
• In poorly differentiated tumors, VEGF-driven angiogenesis may involve different pathways associated with aggressiveness.
• Understanding these distinct angiogenic mechanisms could inform therapeutic strategies for neuroblastic tumors.