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

155 citations , May 2016 in “Nature communications”

Memory T cells in the skin balance staying put and moving into the blood, clustering around hair follicles, and increasing in number after infection.

research Cutting Edge: Memory Regulatory T Cells Require IL-7 and Not IL-2 for Their Maintenance in Peripheral Tissues

140 citations , March 2013 in “The journal of immunology/The Journal of immunology”

Memory regulatory T cells need IL-7, not IL-2, to stay in peripheral tissues.

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”

IL-17 is more important than IFN-γ in causing severe hair loss in chronic alopecia areata.

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”

IL-17 and certain immune cells are linked to more severe alopecia areata.

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”

IL-17 plays a key role in severe hair loss in chronic alopecia areata.

research Hair follicle–derived IL-7 and IL-15 mediate skin-resident memory T cell homeostasis and lymphoma

245 citations , October 2015 in “Nature medicine”

Hair follicle-derived IL-7 and IL-15 are crucial for maintaining skin-resident memory T cells and could be targeted for treating skin diseases and lymphoma.

research Resident Memory T Cells in Autoimmune Skin Diseases

50 citations , May 2021 in “Frontiers in immunology”

Certain immune cells contribute to skin autoimmune diseases, and some treatments can reverse hair loss in these conditions.

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 0960 Evidence for resident memory T cells and necroptosis as drivers of fibrosis in eosinophilic fasciitis and morphea

July 2025 in “Journal of Investigative Dermatology”

Resident memory T cells and necroptosis may drive fibrosis in eosinophilic fasciitis and morphea.

research 036 Expanded T cells under lymphopenic condition exhibit memory phenotype and infiltrate around hair follicle

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

T cells with memory features grow in number and gather around hair follicles when there are not enough immune cells.

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

January 2026 in “Experimental Dermatology”

Skin-resident memory T cells may contribute to chronic alopecia areata and baricitinib could be a potential treatment.

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 Local heroes or villains: tissue-resident memory T cells in human health and disease

67 citations , January 2020 in “Cellular & Molecular Immunology/Cellular & molecular immunology”

Tissue-resident memory T cells can protect against infections and cancer but may also contribute to autoimmune diseases.

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

January 2012 in “heiDOK (Heidelberg University)”

Dormant melanoma cells in mice interact minimally with memory T cells due to a suppressive tumor environment.

research 499 Possible involvement of skin resident memory T cells in refractory alopecia areata

November 2024 in “Journal of Investigative Dermatology”

research Gamma/delta T cells and human skin reactivity to heavy metals

13 citations , February 1995 in “Archives of Dermatological Research”

Gamma/delta T cells help defend skin against heavy metals.

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

May 2023 in “The Journal of Immunology”

Alopecia areata involves unique activation of certain immune cells.

research Low-Dose IL-2 for Treating Moderate to Severe Alopecia Areata: A 52-Week Multicenter Prospective Placebo-Controlled Study Assessing its Impact on T Regulatory Cell and NK Cell Populations

22 citations , September 2020 in “The journal of investigative dermatology/Journal of investigative dermatology”

The study's results on the effectiveness of low-dose IL-2 for alopecia areata and its impact on immune cells were not provided.

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

16 citations , March 2017 in “Oncotarget”

SOCS3 treatment can prevent hair loss by stopping harmful immune responses.

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

64 citations , July 2016 in “Journal of Immunology”

Blocking the CXCR3 receptor reduces T cell accumulation in the skin and prevents hair loss in mice.

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”

Frontal fibrosing alopecia is linked to increased immune system activity and reduced stem cells, suggesting early treatment targeting this pathway might prevent hair follicle damage.

research Developing Human Skin Contains Lymphocytes Demonstrating a Memory Signature

25 citations , November 2020 in “Cell Reports Medicine”

Developing human skin has immune cells with memory-like features.

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

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

The study suggests that a specific type of immune cell, memory-like NK cells, may increase during active hair loss in Alopecia areata.

research Skin-infiltrating CD4+ lymphoma cells depend on hair follicle-derived IL-7

September 2016 in “Journal of Dermatological Science”

Hair follicles produce IL-7, which is essential for certain skin lymphoma cells to survive.

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 83 Transcriptomic meta-analysis and deconvolution approaches unveil cellular dynamics in scarring and non-scarring primary lymphocytic alopecias

November 2023 in “Journal of Investigative Dermatology”

Different types of hair loss have unique cellular changes, suggesting new treatment targets.

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Related Terms

Research

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

research Cutting Edge: Memory Regulatory T Cells Require IL-7 and Not IL-2 for Their Maintenance in Peripheral Tissues

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

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

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

research Hair follicle–derived IL-7 and IL-15 mediate skin-resident memory T cell homeostasis and lymphoma

research Resident Memory T Cells in Autoimmune Skin Diseases

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

research 0960 Evidence for resident memory T cells and necroptosis as drivers of fibrosis in eosinophilic fasciitis and morphea

research 036 Expanded T cells under lymphopenic condition exhibit memory phenotype and infiltrate around hair follicle

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

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

research Local heroes or villains: tissue-resident memory T cells in human health and disease

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

research 499 Possible involvement of skin resident memory T cells in refractory alopecia areata

research Gamma/delta T cells and human skin reactivity to heavy metals

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

research Low-Dose IL-2 for Treating Moderate to Severe Alopecia Areata: A 52-Week Multicenter Prospective Placebo-Controlled Study Assessing its Impact on T Regulatory Cell and NK Cell Populations

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

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

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

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

research Developing Human Skin Contains Lymphocytes Demonstrating a Memory Signature

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

research Skin-infiltrating CD4+ lymphoma cells depend on hair follicle-derived IL-7

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

research Virtual memory is a big hairy deal

research Developing human fetal skin demonstrates a unique lymphocyte signature

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

research 83 Transcriptomic meta-analysis and deconvolution approaches unveil cellular dynamics in scarring and non-scarring primary lymphocytic alopecias