Bibliographic record
Abstract
PURPOSE OF REVIEW: The purpose of this study is to describe recent advances in our understanding of the role of interleukin-21 (IL-21) in B-cell maturation, and how defects in IL-21 receptor (IL-21R) signalling pathways (IL-21R/γc/JAK3/STAT3) are related to primary immune deficiencies. RECENT FINDINGS: Abnormal signalling through IL-21R/γc/JAK3/STAT3 pathway has been related to decreased specific antibody responses following vaccination, and to increased susceptibility to encapsulated bacterial infections. This is manifested in the hyper-IgE syndrome, X-linked and JAK3-related severe combined immunodeficiency (SCID) and loss-of-function mutations in the IL-21R gene. Common variable immunodeficiency is associated with impaired in-vitro development of peripheral blood mononuclear cells or purified B-cells into memory or CD38 B-cells following addition of IL-21. SUMMARY: IL-21 is a key cytokine in development of B-cells into immunoglobulin-secreting cells. Abnormal signalling through the IL-21R/γc/JAK3/STAT3 pathway leads to defective humoral immune responses to both T-dependent and T-independent antigens and impairs the establishment of long-lasting B-cell memory. Studies involving patients with hyper-IgE syndrome demonstrated the nonredundant role of STAT3 in B-cell production of high-affinity specific antibodies, while total serum immunoglobulins could be maintained through STAT3-independent activation of AID (activation-induced cytidine-deaminase). IL-21 related defects may also be associated with reduced natural killer (NK)-cell cytotoxicity and TH17 cytokine production, indicating that abnormalities in the IL-21-IL-21R pathway have profound effects on crucial immune responses.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.002 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.000 | 0.001 |
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; both teacher heads agree on what is shown here.
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".