Differentiation of immature DCs into endothelial-like cells in human esophageal carcinoma tissue homogenates.

We previously reported endothelial-like differentiation (ELD) of immature dendritic cells (iDCs) in the microenvironment derived from EC9706 human esophageal squamous cell carcinoma conditioned medium (CM). However, the CM is far different from the esophageal carcinoma tissue of patients. In addition, the potential role of peri-esophageal carcinoma in the ELD of iDCs is also unknown.

VEGF-A-induced immature DCs not mature DCs differentiation into endothelial-like cells through ERK1/2-dependent pathway.

Dendritic cells (DCs) are professional antigen-presenting cells that play an important role in anti-tumour immunity. Endothelial-like differentiation of DCs is an interesting phenomenon. The specific role of vascular endothelial growth factor-A (VEGF-A) on the differentiation of immature DCs (iDCs) and mature DCs (mDCs) is worth further research.

VEGF-A not Ang2 mediates endothelial-like differentiation of immature DCs by ERK1/2 signaling in the microenvironment of human colon adenocarcinoma.

Endothelial-like differentiation of dendritic cells (DCs) is an interesting and significant phenomenon, which is worth further investigation. Here, we show that the tumor microenvironment derived from the supernatant of the SW620 human colon adenocarcinoma cell line and colon adenocarcinoma tissue homogenate can promote immature DCs (iDCs) to differentiate from the DC pathway toward endothelial cells, while the peri-carcinoma homogenate supernatant does not have this role. Inhibition of angiopoietin-2 (Ang2) in the supernatant by its antibody has no obvious influence on the endothelial-like differentiation.

MAPK/ERK1/2 signaling mediates endothelial-like differentiation of immature DCs in the microenvironment of esophageal squamous cell carcinoma.

Endothelial-like differentiation of dendritic cells (DCs) is a new phenomenon, and the mechanism is still elusive. Here, we show that the tumor microenvironment derived from the human esophageal squamous cell carcinoma (ESCC) cell line EC9706 can induce immature DCs (iDCs) differentiate toward endothelial cells, and become endothelial-like cells, but it has no obvious influence on mature DCs. During the course of endothelial-like differentiation of iDCs, a sustained activation of mitogen-activated protein kinase/extracelluar signal-regulated kinase1/2 (MAPK/ERK1/2) and cAMP response element-binding protein (CREB) was detected.

[Effect of the microenvironment of esophageal carcinoma on dendritic cells].

Aim: To study the effect of microenvironment simulated by esophageal carcinoma homogenate supernatant on the differentiation and development of human dendritic cells (DCs) and to investigate the mechanisms of tumor immune escape for the clinical application of DC vaccines.

Methods: Fresh esophageal carcinoma and peri-cancer tissues were collected to prepare homogenate supernatant and the content of VEGF-A was detected by ELISA. The peripheral blood monouclear cells were isolated by density gradient centrifugation and cultured with RPMI1640 medium including rhGM-CSF and rhIL-4 to induce to DCs.