Vγ9Vδ2-T lymphocytes have impaired antiviral function in small-for-gestational-age and preterm neonates

Area of Science:

• Immunology
• Neonatal Medicine
• Infectious Diseases

Background:

• Vγ9Vδ2-T cells are crucial for adult antiviral defense.
• Preterm and small-for-gestational-age (SGA) neonates are highly susceptible to infections.
• The role of Vγ9Vδ2-T cells in neonatal immunity is not well understood.

Purpose of the Study:

• To investigate the frequency and antiviral function of Vγ9Vδ2-T cells in neonates.
• To compare neonatal Vγ9Vδ2-T cell characteristics with those of adults.
• To explore the correlation between Vγ9Vδ2-T cell function and gestational age/birth weight.

Main Methods:

• Analysis of Vγ9Vδ2-T cell frequency in neonatal blood samples.
• Assessment of Vγ9Vδ2-T cell cytokine responses upon influenza virus stimulation.
• Evaluation of Vγ9Vδ2-T cell expansion using isopentenyl pyrophosphate (IPP).

Main Results:

• Neonates exhibit significantly lower Vγ9Vδ2-T cell percentages compared to adults.
• Neonatal Vγ9Vδ2-T cells, particularly in preterm and SGA infants, show diminished and delayed antiviral cytokine responses.
• Antiviral responses correlate positively with gestational age and birth weight, with weaker T cell expansion observed in neonates.

Conclusions:

• Depressed Vγ9Vδ2-T cell frequency and function contribute to increased microbial infection susceptibility in neonates, especially preterm and SGA infants.
• Targeting Vγ9Vδ2-T cell function may offer a novel approach for preventing viral infections in newborns.
• Further research into enhancing neonatal Vγ9Vδ2-T cell activity is warranted.