COMPARATIVE STUDY
JOURNAL ARTICLE
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Studies on T cells in newborns. Higher reactivity of umbilical cord blood lymphocytes to PHA as measured by whole blood microtechnique.

The capacity of human foetal lymphocytes to respond to PHA and to form E-rosettes have been compared with data from adult individuals. For this purpose a microculture system that uses whole blood and avoids the problems of lymphocyte separation, has been developed. Foetal lymphocytes reached optimal stimulation with lower dosis of PHA (31,2 microgram/ml) as compared with adult cells (125-252 microgram/ml). However their quantitative response (measured by 14C-thymidine uptake) was equal in both groups. In addition, peripheral T cells (E-rosetting cells) reached values of 36.47 +/- 9% in newborn and 49.6 +/- 10% in normal adult controls. These results are discussed as to the status and development of cellular inmunity in human foetus.

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