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Published on: February 4, 2015
The CXCL12 (SDF-1)/CXCR4 axis is essential for the development of renal vasculature
Yoshitsugu Takabatake1, Tatsuki Sugiyama, Hiroshi Kohara
1Department of Geriatric Medicine and Nephrology, Osaka University Graduate School of Medicine (B6), Suita, Japan. takaba@kid.med.osaka-u.ac.jp
Insights
CXC chemokine ligand 12 (CXCL12) and its receptor CXCR4 are crucial for kidney blood vessel formation. Deficiencies in CXCL12 or CXCR4 lead to defective renal vasculature, highlighting their role in kidney development.
Area of Science:
- Renal physiology and developmental biology
- Molecular signaling in organogenesis
- Vascular development and regeneration
Background:
- CXC chemokine ligand 12 (CXCL12) and its receptor CXCR4 mediate essential signaling pathways.
- While vital for gastrointestinal vascularization, CXCL12/CXCR4's role in kidney development is not well understood.
- Stromal cells and podocytes are identified as sources of CXCL12 in the embryonic kidney.
Purpose of the Study:
- To investigate the role of CXCL12/CXCR4 signaling in embryonic kidney development.
- To determine the specific cellular contributions of CXCL12 and CXCR4 to renal vascularization.
- To identify potential therapeutic targets for kidney injury and regeneration.
Main Methods:
- Analysis of CXCL12- and CXCR4-deficient mouse models.
- Generation of endothelial cell-specific CXCR4-deficient mice.
- Histological examination of kidney development, nephrogenesis, and vascular patterning.
- Immunohistochemical localization of CXCL12 and CXCR4 in embryonic kidneys.
Main Results:
- CXCL12-secreting stromal cells and podocytes were found near CXCR4-positive epithelial and endothelial cells in embryonic kidneys.
- CXCL12- and CXCR4-deficient kidneys showed normal nephrogenesis and podocyte/tubule differentiation but defective vascular development.
- Endothelial cell-specific CXCR4 deficiency phenocopied the vascular defects observed in global knockout mice.
- Ballooning of glomerular tufts and disorganized renal vasculature were prominent features.
Conclusions:
- CXCL12, secreted by stromal cells or podocytes, acts on endothelial cells via CXCR4 to regulate kidney vascular development.
- The CXCL12/CXCR4 axis is critical for proper renal vascular patterning.
- Targeting the CXCL12/CXCR4 pathway may offer therapeutic strategies for kidney repair and regeneration.
Abstract:
CXC chemokine ligand 12 (CXCL12; stromal cell-derived factor 1) is a unique homeostatic chemokine that signals through its cognate receptor, CXCR4. CXCL12/CXCR4 signaling is essential for the formation of blood vessels in the gastrointestinal tract during development, but its contribution to renal development remains unclear. Here, we found that CXCL12-secreting stromal cells surround CXCR4-positive epithelial components of early nephrons and blood vessels in the embryonic kidney. In glomeruli, we observed CXCL12-secreting podocytes in close proximity to CXCR4-positive endothelial cells. Both CXCL12- and CXCR4-deficient kidneys exhibited identical phenotypes; there were no apparent abnormalities in early nephrogenesis or in differentiation of podocytes and tubules, but there was defective formation of blood vessels, including ballooning of the developing glomerular tuft and disorganized patterning of the renal vasculature. To clarify the relative importance of different cellular defects resulting from ablation of CXCL12 and CXCR4, we established endothelial cell-specific CXCR4-deficient mice, which recapitulated the renal phenotypes of conventional CXCR4-deficient mice. We conclude that CXCL12 secreted from stromal cells or podocytes acts on endothelial cells to regulate vascular development in the kidney. These findings suggest new potential therapeutic targets for remodeling the injured kidney.
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