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| Author(s): |
Ana Lúcia Silveira Lessa
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Ciências Biomédicas (ICB/SDI) |
| Defense date: | 2014-11-26 |
| Examining board members: |
Patricia Palmeira;
Marcelo Urbano Ferreira;
Vera Lúcia Jornada Krebs;
Alessandra Pontillo;
Maria Notomi Sato
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| Advisor: | Patricia Palmeira |
| Abstract | |
The immaturity of the adaptive immune system at birth involves functional changes in antigen-presenting cells. The objective was to evaluate the activation via TLR-4 and response of monocytes from umbilical cord blood of preterm newborns (NB) < 34 weeks (Group 1), preterm NB <font face=\"Symbol\">³34 and < 37 weeks (Group 2) and term NB (Group 3). The results show high production of IL-8, TNF-a, IL-1b and IL-6 and a significantly lower production of IL-10 by neonatal monocytes. NF-kB factor presented similar activation among neonates and adults. p38, ERK-1/2 and IRAK-4 molecules were more activated in monocytes of newborns from Group 1 as compared to newborns from Group 3 and adults. The phagocytic ability of monocytes and neutrophils from newborns showed a reduced competence. The H2O2 production was reduced in monocytes and neutrophils only in preterm newborns. The results suggest a functionally distinct neonatal immune profile, revealing an imbalance of the innate immune response, with a lower efficiency in the control of this response, which could lead to a predisposition to sepsis. (AU) | |