Granulocyte colony-stimulating factor induces in vitro lymphangiogenesis

Area of Science:

• Vascular Biology
• Cell Signaling
• Regenerative Medicine

Background:

• Granulocyte-colony stimulating factor (G-CSF) is known to influence monocyte differentiation and angiogenesis.
• The role of G-CSF in lymphangiogenesis, the formation of lymphatic vessels, remains unclear.

Purpose of the Study:

• To investigate the effects of G-CSF on lymphangiogenesis in human lymphatic endothelial cells (hLECs).
• To elucidate the underlying molecular mechanisms of G-CSF-induced lymphangiogenesis.

Main Methods:

• In vitro studies using hLECs to assess capillary-like tube formation, migration, and proliferation in response to G-CSF.
• Analysis of signaling pathways, including Akt and ERK1/2 phosphorylation.
• In vivo studies involving G-CSF administration to mice to evaluate peritoneal lymphangiogenesis.

Main Results:

• G-CSF significantly induced capillary-like tube formation, migration, and proliferation of hLECs in a dose- and time-dependent manner.
• G-CSF enhanced thoracic duct sprouting and peritoneal lymphangiogenesis in mice.
• G-CSF treatment increased the phosphorylation of Akt and ERK1/2 signaling pathways in hLECs.
• Inhibition of phosphatidylinositol 3'-kinase and MAPK pathways suppressed G-CSF-induced lymphangiogenesis.

Conclusions:

• G-CSF acts as a potent lymphangiogenic factor.
• G-CSF-induced lymphangiogenesis is mediated through the activation of Akt and ERK1/2 signaling pathways.
• These findings highlight G-CSF as a potential therapeutic target for conditions involving lymphatic vessel formation.