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  • 1.
    Qazi, Khaleda Rahman
    et al.
    Stockholm Univ, Sweden.
    Bach Jensen, Georg
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten.
    van der Heiden, Marieke
    Stockholm Univ, Sweden.
    Bjorkander, Sophia
    Stockholm Univ, Sweden.
    Holmlund, Ulrika
    Stockholm Univ, Sweden.
    Haileselassie, Yeneneh
    Stockholm Univ, Sweden.
    Kokkinou, Efthymia
    Stockholm Univ, Sweden.
    Marchini, Giovanna
    Karolinska Inst, Sweden.
    Jenmalm, Maria
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för neuro- och inflammationsvetenskap. Linköpings universitet, Medicinska fakulteten.
    Abrahamsson, Thomas
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Barn- och kvinnocentrum, H.K.H. Kronprinsessan Victorias barn- och ungdomssjukhus Linköping/Motala.
    Sverremark-Ekstrom, Eva
    Stockholm Univ, Sweden.
    Extremely Preterm Infants Have Significant Alterations in Their Conventional T Cell Compartment during the First Weeks of Life2020Inngår i: Journal of Immunology, ISSN 0022-1767, E-ISSN 1550-6606, Vol. 204, nr 1, s. 68-77Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Extremely preterm neonates are particularly susceptible to infections, likely because of severely impaired immune function. However, little is known on the composition of the T cell compartment in early life in this vulnerable population. We conducted a comprehensive phenotypic flow cytometry-based longitudinal analysis of the peripheral conventional T cell compartment of human extremely low gestational age neonates (ELGAN) with extremely low birth weight (ELBW; amp;lt;1000 g) participating in a randomized placebo-controlled study of probiotic supplementation. PBMCs from ELGAN/ELBW neonates were collected at day 14, day 28, and postmenstrual week 36. Comparisons were made with full-term 14-d-old neonates. Total CD4(+) and CD8(+) T cell frequencies were markedly lower in the preterm neonates. The reduction was more pronounced among the CD8(+) population, resulting in an increased CD4/CD8 ratio. The preterm infants were also more Th2 skewed than the full-term infants. Although the frequency of regulatory T cells seemed normal in the ELGAN/ELBW preterm neonates, their expression of the homing receptors alpha 4 beta 7, CCR4, and CCR9 was altered. Notably, ELGAN/ELBW infants developing necrotizing enterocolitis before day 14 had higher expression of CCR9 in CD4(+)T cells at day 14. Chorioamnionitis clearly associated with reduced T regulatory cell frequencies and functional characteristics within the preterm group. Finally, probiotic supplementation with Lactobacillus reuteri did not impose any phenotypic changes of the conventional T cell compartment. In conclusion, notable immaturities of the T cell compartment in ELGAN/ELBW neonates may at least partially explain their increased susceptibility to severe immune-mediated morbidities.

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