Size of adipose cells in infancy

Area of Science:

• Pediatrics
• Developmental Biology
• Cell Biology

Background:

• Adipose tissue development is crucial for infant metabolic health.
• Understanding adipocyte growth patterns provides insights into early life physiology.

Purpose of the Study:

• To investigate the growth trajectory of adipose cells in infants from fetal life to 18 months.
• To compare adipose cell size based on anatomical location and gestational age.

Main Methods:

• Microscopic analysis of adipose tissue samples obtained from 59 infants (25 weeks gestation to 18 months).
• Measurement of mean adipose cell diameter across different age groups and anatomical sites (buttocks vs. abdominal wall).

Main Results:

• Mean adipose cell diameter increased from approximately 40 µm at 25 weeks gestation to 50-80 µm at term.
• Buttock adipose cells were larger than abdominal wall cells.
• By 3 months postpartum, mean cell diameter reached approximately 90 µm.
• Adipose cell growth rates were similar in preterm infants, whether developing in utero or ex utero.

Conclusions:

• Adipose cell size exhibits a consistent growth pattern throughout infancy, starting in fetal development.
• Adipose cell growth is site-specific, with larger cells found in the buttocks.
• The rate of adipocyte development is not significantly affected by the intrauterine or extrauterine environment post-preterm birth.