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Glossary Memory T Cells

cells that remember past infections for faster future responses

Memory T Cells, also known as Memory T Lymphocytes, are a type of immune cell that "remembers" past infections. After an initial encounter with a pathogen, these cells persist in the body and can quickly mount a strong immune response if the same pathogen is encountered again, providing long-term immunity. This is crucial for the effectiveness of vaccines and the body's ability to fight off repeated infections.

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research 068 Pathogenic Th17 cells, CD8+CD69+CD49a- tissue-resident memory T cells and common γ chain receptor + natural killer cells express more IL-17, compared to IFN-γ, under the foxp3+ memory regulatory T cells-depleted microenvironment in patients with chronic alopecia areata

April 2023 in “Journal of Investigative Dermatology”

This research explored the roles of various T cell types in chronic alopecia areata, finding that increased severity of lesions and hair loss may be linked to decreased lesional Foxp3+ Tregs, with a notable role for IL-17 and Th17 lymphocytes in the pathological process.

research 060 Heterogeneity and lineage development of memory CD8+ T cells after viral infection of skin

July 2022 in “Journal of Investigative Dermatology”

research Generation of autoreactive CD8 T cell in a mouse model of alopecia areata

May 2023 in “The Journal of Immunology”

In this study of C3H/HeJ mice, researchers observed that alopecia areata is associated with the expansion of exhausted-memory CD8 T cells in multiple organs, with autoreactive activation not fully explained by known mechanisms, shedding light on the immunological dynamics underlying the condition.

research Predominant expression of interleukin (IL)‐17 in chronic alopecia areata compared to IFN‐γ in pathogenic Th17 cells, tissue‐resident memory T cells and natural killer cells

3 citations , January 2023 in “JEADV Clinical Practice”

This study suggests that IL-17 may play a more significant role than IFN-γ in the pathogenesis of chronic alopecia areata, with increasing severity linked to Th17 lymphocytes and cytotoxic T lymphocyte infiltration.

research 042 Characterization of Pathogenic CD8+ T Cells in an adoptive transfer Mouse Model of Alopecia Areata in C3H/HeJ mice

November 2025 in “Journal of Investigative Dermatology”

Certain CD8+ T cells attack hair follicles in alopecia areata, suggesting they could be targeted for treatment.

research 083 More Expression of IL-17 than IFN-γ from CD49a-negative Tissue-Resident Memory T (Trm) cells at the Hair Bulge and Hair Bulb Region in the Scalp of Chronic Alopecia Areata Patients according to the Foxp3+mTregs depletion

September 2019 in “Journal of Investigative Dermatology”

This study found that in chronic alopecia areata, increased IL-17 expression and CD8+CD49a-Trm cell infiltration in hair follicles were associated with more severe histopathologic gradings, while Foxp3+mTreg infiltration decreased.

research Skin CD4+ memory T cells exhibit combined cluster-mediated retention and equilibration with the circulation

155 citations , May 2016 in “Nature communications”

This study found that mouse skin CD4(+) memory T cells are in equilibrium with the circulation under steady state but increase in specific clusters in response to infection or inflammation.

research Possible Involvement of Skin‐Resident Memory T Cells in Refractory Chronic Alopecia Areata

January 2026 in “Experimental Dermatology”

The study suggests that refractory chronic alopecia areata cases have more infiltrating skin resident memory T cells, and using a JAK inhibitor may be an effective treatment option.

research 470 Exploring the possible involvement of skin-resident memory T cells in refractory chronic alopecia areata

November 2025 in “Journal of Investigative Dermatology”

Chronic refractory alopecia areata has more skin-resident memory T cells, and JAK inhibitors may help reduce them.

research SOCS3 treatment prevents the development of alopecia areata by inhibiting CD8+ T cell-mediated autoimmune destruction

16 citations , March 2017 in “Oncotarget”

This study suggests that SOCS3 treatment may effectively inhibit alopecia areata by suppressing CD8+ T cell activity and IFN-γ production.

research Human epidermal resident memory T cells: beyond the dermal perspective

July 2026 in “Frontiers in Immunology”

This review highlights the role of epidermal tissue-resident memory T (T RM) cells in human skin, showing their involvement in immune surveillance and regulation within the epidermis, and suggesting their importance in understanding skin diseases like HIV infection and vitiligo.

research Predominance of CD27-PD-1- Effector Memory T Cells Re-Expressing CD45RA Characterizes Treatment-Resistant Severe Alopecia Areata

2 citations , June 2025 in “Journal of Investigative Dermatology”

CD8+ T cells re-expressing CD45RA may predict treatment resistance in severe alopecia areata.

research CXCR3 Blockade Inhibits T Cell Migration into the Skin and Prevents Development of Alopecia Areata

64 citations , July 2016 in “Journal of Immunology”

In this study, blocking the CXCR3 receptor in mice prevented the development of alopecia areata by inhibiting the accumulation of specific T cells in the skin, suggesting a potential therapeutic approach for humans.

research Induction of T cell exhaustion by JAK1/3 inhibition in the treatment of alopecia areata

13 citations , September 2022 in “Frontiers in immunology”

This study found that Ifidancitinib, a JAK1/3 inhibitor, significantly promoted hair regrowth and reduced inflammation in a mouse model of alopecia areata by decreasing pathogenic T cell activity and inducing T cell exhaustion.

Distinctive T Cell Patterns Defining Lymphocytic Alopecia and Alternate Autoimmune and Stem Cell Pathways, Linked to Pleiotropic Functions of Regulatory T Cells Within iSALT

research Distinctive T Cell Patterns Defining Lymphocytic Alopecia and Alternate Autoimmune and Stem Cell Pathways, Linked to Pleiotropic Functions of Regulatory T Cells Within iSALT

June 2026 in “American Journal of Dermatopathology”

This review describes various T-cell-mediated alopecias characterized by distinct lymphocytic patterns and explores their pathophysiology. It highlights the role of CD8+ and regulatory T cells, the JAK/STAT pathway, and stem cell niches, contributing to understanding and potentially addressing these hair loss conditions.

research Dormant tumor cells in ret transgenic mouse melanoma model and their interaction with memory T cells

January 2012 in “heiDOK (Heidelberg University)”

In this study, researchers observed that dormant TRP-2+ melanoma cells in bone marrow can interact with CD8+ T cells in tumor-bearing ret transgenic mice, potentially influencing immune responses.

research Frontal fibrosing alopecia shows robust T helper 1 and Janus kinase 3 skewing

34 citations , June 2020 in “British journal of dermatology/British journal of dermatology, Supplement”

In this study, researchers observed that follicular damage and stem cell loss in frontal fibrosing alopecia may be mediated by immune attacks at the bulge region, suggesting potential for JAK/STAT-targeting treatments to prevent progression.

research 058 Subset analysis of NKG2D+ cells in peripheral blood mononuclear cells

April 2023 in “The journal of investigative dermatology/Journal of investigative dermatology”

This study analyzed blood samples from individuals with alopecia areata and found that NKG2D+ immune cells, particularly memory-like NK cells, may better correlate with disease activity compared to CD8+ cells, though significant variability among individuals complicates these findings.

research Virtual memory is a big hairy deal

July 2023 in “Nature Immunology”

CD8+ virtual memory T cells may cause hair loss in alopecia areata.

research Single-cell sequencing combined with spatial transcriptomics reveals the characteristics of follicle-targeted inflammation patterns in primary cicatricial alopecia

July 2025 in “Cell & Bioscience”

Specific immune cells and pathways contribute to hair follicle inflammation and hair loss, suggesting potential treatments for lichen planopilaris.

research Identification of Immune Microenvironment Changes, Immune-Related Pathways and Genes in Male Androgenetic Alopecia

March 2023 in “Research Square (Research Square)”

In this study, researchers found that changes in immune cell infiltration and immune-related gene expression may contribute to the immune microenvironment changes in male androgenetic alopecia.

research 046 Analysing the mechanistic basis of Ritlecitinib’s therapeutic effects in Alopecia Areata

November 2025 in “Journal of Investigative Dermatology”

Ritlecitinib effectively treats severe Alopecia Areata by reducing harmful immune activity in the skin.

research Vitiligo: An Autoimmune Skin Disease and its Immunomodulatory Therapeutic Intervention

61 citations , December 2021 in “Frontiers in Cell and Developmental Biology”

This review discusses progress in targeted therapies for vitiligo, focusing on Janus kinase inhibitors and the potential of mesenchymal stem cells, but reports no new clinical results.

research DataSheet1_Vitiligo: An Autoimmune Skin Disease and its Immunomodulatory Therapeutic Intervention.PDF

December 2021 in “Figshare”

This review discusses recent advancements in targeted therapies for vitiligo, including JAK inhibitors and mesenchymal stem cells, and highlights the need for further research.

research Developing human fetal skin demonstrates a unique lymphocyte signature

1 citations , June 2020 in “bioRxiv (Cold Spring Harbor Laboratory)”

In this study, researchers identified unique prenatal lymphocyte features in human fetal skin, including proliferative naive T cells and memory-like T cells, which may influence antigen and allergen responses in utero and infancy.

research SnapshotDx Quiz: March 2016

February 2016 in “The journal of investigative dermatology/Journal of investigative dermatology”

This quiz presents educational questions about alopecia areata, including its diagnosis and underlying mechanisms, but reports no new clinical outcomes.

research Inhibiting Janus kinases to treat alopecia areata

52 citations , September 2014 in “Nature medicine”

JAK inhibitors might help treat alopecia areata.

research Integrated single-cell chromatin and transcriptomic analyses of peripheral immune cells in patients with alopecia areata

4 citations , July 2025 in “Frontiers in Immunology”

This study explored peripheral blood immune dysregulation in alopecia areata through single-cell analyses, identifying systemic changes linked to disease severity and key signaling roles for monocytes, NK cells, and memory T cells, suggesting potential therapeutic targets.

Multimodal Profiling Reveals Site-Specific Adaptation and Tissue Residency Hallmarks of Gamma Delta T Cells Across Organs in Mice

research Multimodal profiling reveals site-specific adaptation and tissue residency hallmarks of γδ T cells across organs in mice

23 citations , January 2024 in “Nature Immunology”

This study, using multimodal profiling in mice, found that various tissues contain unique γδ T cell subsets adapted to their environment, revealing their functional diversity, lineage relationships, and similarities to CD8+ tissue-resident memory T cells.

research iNKT cells ameliorate human autoimmunity: Lessons from alopecia areata

27 citations , April 2018 in “Journal of autoimmunity”

In this study, iNKT10 cells were found to play a significant role in preventing and treating alopecia areata in a humanized mouse model, suggesting these cells could have potential in managing related autoimmune disorders.