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2018 ; 9
(ä): 339
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Influence of Inflammation in the Process of T Lymphocyte Differentiation:
Proliferative, Metabolic, and Oxidative Changes
#MMPMID29545794
Moro-García MA
; Mayo JC
; Sainz RM
; Alonso-Arias R
Front Immunol
2018[]; 9
(ä): 339
PMID29545794
show ga
T lymphocytes, from their first encounter with their specific antigen as naïve
cell until the last stages of their differentiation, in a replicative state of
senescence, go through a series of phases. In several of these stages, T
lymphocytes are subjected to exponential growth in successive encounters with the
same antigen. This entire process occurs throughout the life of a human
individual and, earlier, in patients with chronic infections/pathologies through
inflammatory mediators, first acutely and later in a chronic form. This process
plays a fundamental role in amplifying the activating signals on T lymphocytes
and directing their clonal proliferation. The mechanisms that control cell growth
are high levels of telomerase activity and maintenance of telomeric length that
are far superior to other cell types, as well as metabolic adaptation and redox
control. Large numbers of highly differentiated memory cells are accumulated in
the immunological niches where they will contribute in a significant way to
increase the levels of inflammatory mediators that will perpetuate the new state
at the systemic level. These levels of inflammation greatly influence the process
of T lymphocyte differentiation from naïve T lymphocyte, even before, until the
arrival of exhaustion or cell death. The changes observed during lymphocyte
differentiation are correlated with changes in cellular metabolism and these in
turn are influenced by the inflammatory state of the environment where the cell
is located. Reactive oxygen species (ROS) exert a dual action in the population
of T lymphocytes. Exposure to high levels of ROS decreases the capacity of
activation and T lymphocyte proliferation; however, intermediate levels of
oxidation are necessary for the lymphocyte activation, differentiation, and
effector functions. In conclusion, we can affirm that the inflammatory levels in
the environment greatly influence the differentiation and activity of T
lymphocyte populations. However, little is known about the mechanisms involved in
these processes. The elucidation of these mechanisms would be of great help in
the advance of improvements in pathologies with a large inflammatory base such as
rheumatoid arthritis, intestinal inflammatory diseases, several infectious
diseases and even, cancerous processes.