Improper hydration induces global gene expression changes associated with renal development in infant mice

Area of Science:

• Developmental Biology
• Nephrology
• Physiology

Background:

• Renal development is crucial for kidney function, with prenatal processes extensively studied.
• Postnatal renal development from infancy to juvenile stages remains under-investigated.
• Understanding early-life kidney development is key to addressing pediatric health issues.

Purpose of the Study:

• To investigate ongoing structural and functional kidney development in infant and juvenile mice.
• To analyze the effects of dehydration on kidney development during early life.
• To elucidate the molecular mechanisms underlying dehydration's impact on pediatric renal development.

Main Methods:

• Infant mice (4 weeks old) were subjected to dehydration for 1 or 4 weeks.
• Control mice had ad libitum water access.
• Transcriptome analysis was performed on kidneys to identify physiological changes.

Main Results:

• Distinct functional gene networks were observed in infantile and juvenile kidneys.
• Infantile kidneys showed upregulated cell cycle and immature basement membrane genes.
• Juvenile kidneys exhibited heightened expression of ion transport and drug metabolism genes.
• Dehydration suppressed renal growth by interrupting the SHH signaling pathway and downregulating basement membrane integrity genes.

Conclusions:

• Transcriptional events in infant renal development were identified.
• Inadequate water intake in early life impairs normal renal development.
• Infants are more vulnerable to dehydration due to impaired renal development.
• Optimal nutritional interventions are crucial for pediatric renal development.