Receptor expression is essential for forward motility in the course of sperm cell maturation
Bibliographic record
Abstract
Forward motility stimulating factor (FMSF) is a glycoprotein previously purified from buffalo blood serum that promotes progressive motility of caprine caudal spermatozoa. We have prepared a functionally active covalent conjugate of this factor with horseradish-peroxidase (HRP) to obtain an idea of its binding efficacy on maturing spermatozoa. Receptor-assay was performed using FMSF-HRP conjugate in saturating conditions to bind with spermatozoa isolated from different epididymal segments. Activity and binding profile of the motility stimulating factor coincided, suggesting both these parameters come into play only partially when spermatozoa reach the maturation state in the distal-corpus region and largely in caudal part (around 24% and 80% binding and 10% and 79% forward motility, respectively). Spermatozoa from caput up to mid-corpus regions neither displayed any substantial binding with FMSF nor exhibited significant induction in forward motility. Study of cell surface-bound FMSF on maturing spermatozoa in physiological milieu demonstrated their presence on anterior spermhead and suggests a nearly similar pattern of occurrence. Flow-cytometric analysis also implies analogous presence of this receptor. The factor was also immunodetected in uterine fluids of cattle species. This study displays a maturation-dependent expression of FMSF-receptor and consequential stimulation of forward motility that may be crucial for its journey to meet the ovum.
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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 | 0.000 |
| Bibliometrics | 0.000 | 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 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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 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".