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Naïve T cells get activated upon encounter with their cognate antigen and differentiate into a specific subset of effector cells. These T cells are themselves plastic and are able to re-differentiate into another subset, changing both phenotype and function. Differentiation into a specific subset depends on the nature of the antigen and of the environmental milieu. Notably, certain nutrients, such as vitamins A and D, sodium chloride, have been shown to modulate T cell responses and influence T cell differentiation. Parasite infection can also skew Th differentiation. Similarly, the gut microbiota regulates the development of immune responses. Lastly, the key role of metabolism on T cells has also been demonstrated. This series of articles highlights some of the multiple links existing between environmental factors and T cell responses.

regulatory T cells --- Vitamin D --- helminth --- T cells --- Metabolism --- microbiome

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Medicine --- Immunology --- TNF --- TNFR2 --- CD4+Foxp3+ regulatory T cells --- myeloid-derived suppressive cells --- mesenchymal stem cells --- inflammation --- cancer --- autoimmune diseases --- TNF --- TNFR2 --- CD4+Foxp3+ regulatory T cells --- myeloid-derived suppressive cells --- mesenchymal stem cells --- inflammation --- cancer --- autoimmune diseases

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

TNF --- TNFR2 --- CD4+Foxp3+ regulatory T cells --- myeloid-derived suppressive cells --- mesenchymal stem cells --- inflammation --- cancer --- autoimmune diseases

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

haploidentical transplantation --- T-cell depleted grafts --- T-cell-replete grafts --- post-transplantation cyclophosphamide --- immune reconstitution --- adoptive cell therapy --- regulatory T cells --- immune evasion

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Oligonucleotides (ON) constitute a new group of molecular agents, the object of significant interest due to their potential value as drugs for diagnostic and therapeutic applications. Their special interest derives from the intrinsic characteristics of ONs: a) ONs are informative agents, a property that derives from the order in which the nucleotides of each particular ON are arranged; b) ONs can act as ligands (ASO, TFO, aptamers, G-quadruplex, etc.) of complementary nucleic acid sequences (DNA or RNA) due to their high capacity to hybridize (by means of Watson and Crick or Hoogsteen links) with other nucleotide sequences, resulting in specific gene modulatory effects. However, nonspecific sequences may also be of interest, as is the case with repetitive nucleotide sequences (CpG) with adjuvant effects of vaccines; c) ONs can also rapidly evolve to achieve specific advantages of utility (targeting, stability, efficacy, toxicity, etc.) or high-sensitivity diagnostic technology (markers, analyzes, biosensors, FISH, microarrays, etc.), by chemical modification of nucleotides in any of their atoms. These properties show that ONs are first-order molecules due to their potential usefulness in practice.In this collection of research articles and review papers, we aim to highlight their therapeutic, but also diagnostic and technological utility as drugs.

Medicine --- quantum dots (QDs) --- DNAzyme --- ROS --- Amplex Red --- light-induced activity --- DNA methylation --- histone code --- microRNA --- nanoparticles --- noncoding RNA --- pulmonary arterial hypertension --- aptamer --- aptasensor --- influenza --- SERS --- virus detection --- α-synuclein --- antisense oligonucleotide --- dopamine neurotransmission --- double mutant A30P*A53T* --- motor deficits --- Parkinson’s disease --- transgenic mouse model --- G-quadruplexes --- covalent dimer construct --- anti-proliferative activity --- primary cell culture of human glioma --- antisensense oligonucleotide --- Foxp3 --- regulatory T cells --- vaccine immunogenicity --- Sporothrix schenckii --- Marfan syndrome --- fibrillin-1 --- antisense oligonucleotides --- exon skipping --- splice-switching --- quantum dots (QDs) --- DNAzyme --- ROS --- Amplex Red --- light-induced activity --- DNA methylation --- histone code --- microRNA --- nanoparticles --- noncoding RNA --- pulmonary arterial hypertension --- aptamer --- aptasensor --- influenza --- SERS --- virus detection --- α-synuclein --- antisense oligonucleotide --- dopamine neurotransmission --- double mutant A30P*A53T* --- motor deficits --- Parkinson’s disease --- transgenic mouse model --- G-quadruplexes --- covalent dimer construct --- anti-proliferative activity --- primary cell culture of human glioma --- antisensense oligonucleotide --- Foxp3 --- regulatory T cells --- vaccine immunogenicity --- Sporothrix schenckii --- Marfan syndrome --- fibrillin-1 --- antisense oligonucleotides --- exon skipping --- splice-switching