[Neonatal gastroenteritis triggers long-term cardiomyocyte atrophy, remodeling and irreversible...

Area of Science:

• Cardiovascular research
• Developmental biology
• Pediatric gastroenterology

Background:

• Early childhood growth issues, inflammation, and cardiac overload are linked to adult hypertension and infarction.
• This phenomenon is known as developmental programming, but its precise mechanisms and critical time frames remain unclear.

Purpose of the Study:

• To investigate the mechanisms and critical time frames of developmental programming in the heart.
• To model cryptosporidial gastroenteritis as a trigger for programming factors in neonatal rats.

Main Methods:

• A rat model of cryptosporidial gastroenteritis was used, varying infection timing from postnatal day 4 to 18.
• Flow cytometry, immunocytochemistry, and confocal microscopy assessed cardiomyocyte shape, protein content, and ploidy.
• Experiments were repeated 30 days post-infection to evaluate long-term effects.

Main Results:

• Gastroenteritis induced cardiomyocyte atrophy, increased cell length-to-width ratio, and premature polyploidization.
• Genome accumulation occurred specifically between postnatal days 6-14, coinciding with the shift from proliferation to hypertrophy.
• Somatic polyploidy was irreversible, while cell shape and protein content showed partial recovery.

Conclusions:

• Gastroenteritis can trigger developmental programming in the neonatal heart.
• Somatic polyploidy, induced by disease during critical developmental windows, is a key mechanism in developmental programming.
• This programming, initiated by early-life infections, may predispose individuals to adult cardiovascular diseases.