Details for: CL4033038

Cell ID: CL4033038

Cell Name: lung resident memory CD4-positive, alpha-beta T cell

Description: An alpha-beta CD4 T cell that resides in the lung.

Synonyms: lung CD4-positive TRM, lung resident memory CD4 T cell

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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Genes

Contexts:

Cell Significance Index (CSI) is uniquely calculated to reveal cell-specific gene markers. More info here

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for lung resident memory CD4-positive, alpha-beta T cell within the selected context(s).

Gene ID: A unique numerical identifier for this specific gene.
Symbol: Shortened abbreviation or name that represents this gene.
Ensembl Gene ID: A unique identifier assigned by Ensembl for genomic data mapping.
CSI Score: A combined effect size and statistical significance measure for lung resident memory CD4-positive, alpha-beta T cell. Higher scores indicate a stronger, more significant difference in expression.
(Previously described as "Fold Change", but now represents Cliff's Delta × –log10(p).)

Gene ID: A unique numerical identifier for this specific gene.
Symbol: Shortened abbreviation or name that represents this gene.
Ensembl Gene ID: A unique identifier assigned by Ensembl for genomic data mapping.
CSI Score: A combined effect size and statistical significance measure for lung resident memory CD4-positive, alpha-beta T cell. Higher scores indicate a stronger, more significant difference in expression.
Average CSI: csi sum / gene count
Cell network configuration

This network visualizes key genes for lung resident memory CD4-positive, alpha-beta T cell. It primarily includes:
1. Top genes highly significant for this cell (Num. Top Cell Genes - based on the 'Min. CSI' setting).
2. Any additional specific 'Context Genes' you add below.
The final network is a combined view. Choose an Interaction Source (pathways or protein interactions) and optionally compare CSI scores with a Baseline Cell Type.

Maximum number of selected genes.
Select a context for the baseline cell.
Select a context for the target cell.
Target Cell for CSI:  lung resident memory CD4-positive, alpha-beta T cell (CL4033038)

 Legend
Nodes (Genes):
 Query Gene
Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
 Very High
 High
 Medium
 Low
 Very Low
 N/A or Not Sig.
Edges (Interactions):
 STRING (Protein-Protein)
 ONTOLOGY (Shared Pathway)
 Colors vary by pathway category; default arrow applies.

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## Summary The [lung resident memory CD4-positive, alpha-beta T cell](/details-cell/CL4033038) is a specialized immune cell residing within the lung tissue, poised for rapid secondary immune responses. Gene significance profiling suggests this cell is characterized by a high state of metabolic readiness and robust protein synthesis, underscored by the prominence of markers like [B2M](/details-gene/567) and mitochondrial-related genes. Functionally, it appears to be a key orchestrator of local immunity, distinguished by its expression of potent chemokines and cytokines such as [CCL5](/details-gene/6352) and [IL32](/details-gene/9235), indicating a primary role in recruiting and activating other immune cells within the lung microenvironment. ## Key Characteristics and Function **Overall**, the molecular signature of the [lung resident memory CD4-positive, alpha-beta T cell](/details-cell/CL4033038) points to a cell that is both metabolically active and immunologically prepared for immediate action. The top markers can be grouped into several key functional clusters: * **Antigen Presentation and Immune Interaction:** The high significance score of [B2M](/details-gene/567), a fundamental component of MHC class I molecules, and [HLA E](/details-gene/3133), a non-classical MHC class I molecule, is noteworthy. While as a CD4+ T cell it primarily recognizes antigens via MHC class II, the strong expression of class I machinery suggests it actively engages in crosstalk with other immune cells, such as [natural killer cells](/details-cell/CL0000623) or [CD8-positive, alpha-beta T cells](/details-cell/CL0000625), which monitor MHC-I expression. * **Effector Cytokine and Chemokine Production:** This cell type is strongly marked by genes encoding secreted immune mediators. The high significance of [CCL5](/details-gene/6352) (RANTES), a powerful chemoattractant for [T-cells](/details-cell/CL0000084), [monocytes](/details-cell/CL0000576), and other leukocytes, positions this cell as a central hub for orchestrating inflammatory infiltrates ([Link](https://pubmed.ncbi.nlm.nih.gov/2456327/)). Similarly, the expression of [IL32](/details-gene/9235), a pro-inflammatory cytokine known to induce TNF-alpha production, suggests this cell directly contributes to amplifying local inflammation ([Link](https://doi.org/10.1016/j.immuni.2004.12.003)). The chemokine receptor [CXCR4](/details-gene/7852) further highlights its role in cellular trafficking and retention within the lung tissue. * **High Metabolic and Biosynthetic Activity:** A prominent feature of this cell is its apparent high metabolic rate, necessary to maintain a state of readiness. This is supported by the high significance of genes involved in mitochondrial respiration, such as [COX1](/details-gene/4512) and [ATP5F1E](/details-gene/514). Furthermore, markers associated with protein synthesis ([EEF1D](/details-gene/1936)), cytoskeletal arrangement ([CFL1](/details-gene/1072)), and glycolysis ([GAPDH](/details-gene/2597)) are all highly significant, painting a picture of a cell with robust housekeeping functions geared towards rapid effector molecule production. * **Complex Transcriptional and Epigenetic Regulation:** The cell's function appears to be under tight control, as indicated by the significance of several regulatory genes. These include the anti-proliferative gene [BTG1](/details-gene/694), the mRNA decay factor [ZFP36L2](/details-gene/678), the transcription factor [KLF6](/details-gene/1316), and the histone demethylase [KDM6B](/details-gene/23135). This suggests a sophisticated network that balances quiescence, survival, and rapid activation to prevent immunopathology while ensuring a swift response. The anti-marker profile provides crucial confirmatory evidence of the cell's identity. The absence of a significant signal for [CD8B](/details-gene/926) definitively confirms its lineage as a CD4+, and not a CD8+, T cell. ## Clinical Significance and Contextual Roles The gene signature of lung CD4+ TRM cells implicates them as critical players in both protective immunity and chronic inflammatory diseases of the lung. Their capacity to produce [CCL5](/details-gene/6352) and [IL32](/details-gene/9235) suggests a central role in the pathogenesis of conditions characterized by persistent leukocyte infiltration, such as chronic obstructive pulmonary disease (COPD), asthma, and pulmonary fibrosis. The high significance of [CXCR4](/details-gene/7852) is clinically relevant, as this receptor is not only crucial for immune cell homing but also serves as a co-receptor for HIV entry. This may indicate that lung CD4+ TRM cells could represent a long-lived viral reservoir in HIV-infected individuals. Furthermore, the expression of genes involved in transcriptional regulation and cell cycle control, such as [BTG1](/details-gene/694) and [KLF6](/details-gene/1316), highlights potential therapeutic targets for modulating the activity of these cells in autoimmune or inflammatory contexts. The presence of histone-modifying enzymes like [KDM6B](/details-gene/23135) suggests that epigenetic regulation is fundamental to maintaining their memory state and could be a target for therapeutic intervention to either boost their protective functions or dampen their pathogenic activity. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** Lung CD4+ TRM cells function as master regulators of local tissue inflammation, primarily through the secretion of chemokines and cytokines that recruit and activate a secondary wave of diverse immune effector cells. Their strategic location and pre-programmed effector capacity allow them to initiate a rapid and robust defense at mucosal surfaces. * **Surprising Findings:** It is notable that [B2M](/details-gene/567), a component of the MHC class I pathway, is a top specificity marker ([csi_z](/details-gene/9.59)) for a CD4+ T cell. This suggests its expression level is exceptionally high and stable in this cell type compared to others, potentially pointing to an underappreciated role in interacting with non-canonical immune partners in the lung. * **Testable Questions:** In a murine model of respiratory viral infection, does conditional ablation of the [Ccl5](/details-gene/6352) gene specifically in lung CD4+ TRM cells lead to a significant reduction in the recruitment of neutrophils and cytotoxic T lymphocytes to the airways and a corresponding decrease in immunopathology? 2. **Hypothesis:** The functional state of lung CD4+ TRM cells is maintained in a "poised" or "alert" condition, characterized by high metabolic activity but restrained by active transcriptional and epigenetic controls to prevent spurious activation and tissue damage. Genes like the anti-proliferative factor [BTG1](/details-gene/694) and the histone demethylase [KDM6B](/details-gene/23135) are key nodes in a regulatory network that balances readiness with quiescence. * **Surprising Findings:** The co-expression of potent pro-inflammatory molecules ([CCL5](/details-gene/6352), [IL32](/details-gene/9235)) alongside significant anti-proliferative ([BTG1](/details-gene/694)) and epigenetic regulators ([KDM6B](/details-gene/23135)) within the same cell type suggests a sophisticated internal rheostat governing its function. This indicates that the cell is not simply "on" or "off" but finely-tuned to its microenvironment. * **Testable Questions:** Does the targeted inhibition of [KDM6B](/details-gene/23135) in established lung CD4+ TRM cells alter their long-term survival or their ability to rapidly produce cytokines like IFN-gamma and IL-17 upon secondary antigen encounter?