B cells compartment in centenarian offspring and old people.

Abstract:

:Immunosenescence is considered a major contributory factor to the increased frequency of morbidity and mortality among elderly. On the other hand centenarians are considered the best example of successful ageing. To gain insight into mechanisms of immunosenescence and its clinical relevance, a possible model is represented by centenarians and/or their offspring. Nowadays centenarians are not more a curiosity, but in Europe are 1/8000 inhabitants and it has been demonstrated that the centenarian offspring, who are typically in their 70s and 80s, have a survival advantage when compared with age-matched controls whose parents died at an average life expectancy. Then again, studies on immunosenescence focus mainly on T cell impairment, although B cells are also affected. So, in the present preliminary report, we have studied B cell compartment in two classes of individuals, old people and centenarian offspring. B cell compartment was analysed using IgD and CD27 antibodies which characterize naïve B cells (IgD(+) CD27(-)), memory unswitched B cells (IgD(+)CD27(+)), memory switched B cells(IgD(-)CD27(+)) and double negative B cells (DN) (IgD(-)CD27(-)), i.e. exhausted memory cells. As expected, in both cohorts we observed a decreased B cell count. However, in centenarian offspring, naïve B cells are more abundant whereas exhausted memory cells (DN B cells, IgD(-)CD27(-)) do not show the increase that we have previously demonstrated in healthy elderly donors. These data are similar to that found in previously experiments on young subjects. So, our preliminary results show that centenarian offspring do not have the typical trend of memory/naive B cell subsets observed in elderly people and this is in agreement with the higher levels of IgM in the serum of centenarian offspring in comparison with data obtained in age-matched controls. This reservoir of naive B cell might be one of the causes that make centenarian offspring able to keep fighting off new infections, hence prolonging their life. So, B cell subset changes could represent a hallmark of successful or unsuccessful ageing and could be used as a biomarker of human life span, potentially useful for the evaluation of anti-ageing treatment.

journal_name

Curr Pharm Des

authors

Colonna-Romano G,Buffa S,Bulati M,Candore G,Lio D,Pellicanò M,Vasto S,Caruso C

doi

10.2174/138161210790883750

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

604-8

issue

6

eissn

1381-6128

issn

1873-4286

pii

Jirillo 14

journal_volume

16

pub_type

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