The human liver microenvironment shapes the homing and function of CD4 <sup>+</sup> T-cell populations
Bibliographic record
Abstract
Objective Tissue-resident memory T cells (T RM ) are vital immune sentinels that provide protective immunity. While hepatic CD8 + T RM have been well described, little is known about the location, phenotype and function of CD4 + T RM . Design We used multiparametric flow cytometry, histological assessment and novel human tissue coculture systems to interrogate the ex vivo phenotype, function and generation of the intrahepatic CD4 + T-cell compartment. We also used leukocytes isolated from human leukocyte antigen (HLA)-disparate liver allografts to assess long-term retention. Results Hepatic CD4 + T cells were delineated into three distinct populations based on CD69 expression: CD69 − , CD69 INT and CD69 HI . CD69 HI CD4 + cells were identified as tissue-resident CD4 + T cells on the basis of their exclusion from the circulation, phenotypical profile (CXCR6 + CD49a + S1PR1 − PD-1 + ) and long-term persistence within the pool of donor-derived leukcoocytes in HLA-disparate liver allografts. CD69 HI CD4 + T cells produced robust type 1 polyfunctional cytokine responses on stimulation. Conversely, CD69 INT CD4 + T cells represented a more heterogenous population containing cells with a more activated phenotype, a distinct chemokine receptor profile (CX 3 CR1 + CXCR3 + CXCR1 + ) and a bias towards interleukin-4 production. While CD69 INT CD4 + T cells could be found in the circulation and lymph nodes, these cells also formed part of the long-term resident pool, persisting in HLA-mismatched allografts. Notably, frequencies of CD69 INT CD4 + T cells correlated with necroinflammatory scores in chronic hepatitis B infection. Finally, we demonstrated that interaction with hepatic epithelia was sufficient to generate CD69 INT CD4 + T cells, while additional signals from the liver microenvironment were required to generate liver-resident CD69 HI CD4 + T cells. Conclusions High and intermediate CD69 expressions mark human hepatic CD4 + T RM and a novel functionally distinct recirculating population, respectively, both shaped by the liver microenvironment to achieve diverse immunosurveillance.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".