Adrenalectomy Does Not Prevent Exercise-Induced Intestinal Lymphocyte Depletion Following Treadmill Exercise In Mice
Bibliographic record
Abstract
0909 Lymphocytopenia is a common occurrence following strenuous exercise that may be responsible for the post-exercise immunosuppression observed in athletes and exercise participants. This increased lymphocyte loss may be due to increased apoptosis mediated by adrenal hormones, especially glucocorticoids (GC), produced during strenuous exercise. Purpose: To examine the role of adrenal hormones in intestinal lymphocyte (IL) loss following strenuous exercise in mice. Methods: Thirty-six female C57BL/6 mice were randomly assigned to receive bilateral adrenalectomy (ADX) or control (SHAM) surgery. One week following surgery mice were randomly assigned to (i) a control condition (nonexercised) in which mice were exposed to treadmill noise and vibration but not running, (ii) treadmill exercise (90min, 28m·min-1, 2° slope) and sacrificed immediately following exercise (immediate), or (iii) treadmill running and sacrificed 24h following running (24h Post). ILs were isolated and T and natural kill (NK) subpoulations were determined by flow cytometry. Plasma corticosterone (CORT) was determined by RIA. Results: Plasma CORT was virtually nil in ADX treated mice (mean ± SEM; 3.1 ± 0.6ng·ml−1). Total IL, CD3αβ+, CD3γδ+, CD8αα+, and NK+ cells recovered from the bowel were significantly higher in ADX (28.4 ± 2.8 × 106; 11.2 ± 1.1 × 106; 10.4 ± 1.6 × 106; 19.7 ± 2.4 × 106; 1.7 ± 0.3 × 106 cells) compared to SHAM mice (21.2 ± 2.2 × 106; 8.5 ± 0.8 × 106; 5.9 ± 0.7 × 106; 11.7 ± 1.1 × 106; 0.9 ± 0.2 × 106 cells; p < 0.05 in each case). Although ADX produced some sparing effect across exercise condition, ADX did not significantly inhibit exercise-induced cell loss. 24h after treadmill exercise there were significantly fewer ILs (16.3 ± 1.8 × 106), CD3αβ+ (7.2 ± 0.8 × 106), and CD8αα+ (8.2 ± 1.2 × 106) cells compared to nonexercised mice (28.4 ± 3.1 × 106; 11.1 ± 1.3 × 106; 18.8 ± 2.6 × 106, respectively; p < 0.05 in each case). Conclusion: Although ADX buffered some IL loss relative to SHAM, the absence of adrenal hormones (most notably GC) did not reverse the exercise-induced intestinal lymphocyte loss observed at 24h post exercise. These data suggest IL depletion observed after strenuous exercise in mice is not mediated by adrenal hormones, at least not directly, and that other mechanisms are likely involved. Research supported by a grant from NSERC Canada (LHG).
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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; a candidate call from one source (direct Gemma or distilled Codex), 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".