Prolonged impairment of cellular immunity in children with intrauterine growth retardation

Area of Science:

• Immunology
• Pediatrics
• Neonatology

Background:

• Cellular immunity plays a crucial role in host defense against infections.
• Intrauterine growth retardation (IUGR) is associated with various health complications.
• The impact of IUGR on developing immune systems requires further investigation.

Purpose of the Study:

• To investigate cellular immunity in infants and children with IUGR.
• To assess T and B lymphocyte function and delayed cutaneous hypersensitivity in IUGR subjects.
• To determine the long-term implications of impaired immunity in IUGR.

Main Methods:

• Studied cellular immunity in 17 newborn infants and 8 children (1-5 years) with IUGR.
• Compared subjects with age-matched controls.
• Assessed peripheral blood lymphocyte counts (T and B cells).
• Evaluated delayed cutaneous hypersensitivity using phytohemagglutinin (PHA).
• Measured in vitro PHA-induced lymphocyte proliferation.

Main Results:

• At birth, IUGR infants showed decreased T and B lymphocytes and diminished PHA skin test responses.
• In vitro lymphocyte proliferation was comparable to controls but higher than adults.
• In later childhood, T lymphocyte numbers were normal, but proliferative capacity and skin test responses were significantly reduced.
• Cellular immunity impairment was prolonged in children with IUGR.

Conclusions:

• Infants with IUGR are born with impaired cellular immunity.
• This immune deficiency persists into childhood, with reduced lymphocyte function.
• Prolonged cellular immunodeficiency in IUGR may lead to increased infections, poor immunization response, and increased risk of allergies, autoimmunity, and cancer.