Interstitial stromal progenitors during kidney development: here, there and everywhere.

Area of Science:

• Developmental Biology
• Renal Physiology
• Cell Biology

Background:

• The renal interstitium hosts diverse cell types crucial for kidney structure and function.
• Limited research exists on the embryonic development of renal interstitial cells.
• Understanding these cells is key to comprehending kidney organogenesis.

Purpose of the Study:

• To review the characteristics of renal interstitial stem/progenitor cells during intrauterine kidney development.
• To analyze key stromal/interstitial compartments in the developing human kidney.
• To synthesize current knowledge on the cellular origins and roles of these progenitors.

Main Methods:

• Literature review focusing on studies of renal interstitial cells during development.
• Analysis of existing data on progenitor cell markers (e.g., Six2, Foxd1).
• Examination of morphological and functional properties of interstitial cell populations.

Main Results:

• Foxd1-expressing cells represent an early non-nephrogenic progenitor population.
• These progenitors give rise to cortical and medullary interstitial cells.
• Developing human kidneys exhibit distinct interstitial cell types in different renal compartments (capsular, cortical, medullary, niche, hilar, ureteric).

Conclusions:

• The developing kidney's interstitial compartments are composed of diverse cell types specific to renal areas.
• The precise origin and heterogeneity of renal interstitial progenitor pools require further investigation.
• Clarifying these progenitors' roles is essential for understanding human nephrogenesis.