Spatio-temporal profile of small heat-shock protein Hsp27 induction in rat brain following fluid-percussion injury to the lateral parietotemporal cerebral cortex; involvement with beta actin
Bibliographic record
Abstract
Heat shock protein 27 (Hsp27) belongs to a group of small Hsps that perform a variety of functions including molecular chaperoning, regulation of actin dynamics and antioxidative activity, and inhibition of apoptosis. In adult rat brain, constitutive neuronal expression of Hsp27 is present in neurons and occasionally non-neuronal cells including astrocytes, ependymal cells and the choroid plexus. Since little is currently known of the involvement of Hsp27 in cerebral trauma, we have examined the effects of moderate fluid-percussion injury (FPI) on the spatio-temporal patterns of Hsp27 induction and potential interaction of Hsp27 with other structural proteins in rat brain. In the ipsilateral parieto-temporal cortex, Hsp27 protein levels were increased over 7-fold at 24 h following the insult compared to sham controls by immunoblotting (Figure 1A), and which persisted for up to 7 days post-trauma. Immunohistochemical assessment revealed a mainly astroglial pattern of staining for Hsp27 in the cortex, hippocampus, and thalamic nuclei ipsilateral to the injury with some immunoreactivity also extending into contralateral hippocampal structures. Immunoprecipitation studies using both injured and contralateral cortical brain tissue of 24 h post-injured rats showed that Hsp27 immunoprecipitated only from the injured, but not contralateral, cortex at 24 h post-injury (Figure 1B). In addition, Hsp27 immunoprecipitate from 24 h post-injured ipsilateral cortex coimmunoprecipitated with beta actin, and not GFAP (Figure 1C). Our results suggest that FPI produces a large, predominantly astroglial-specific induction of Hsp27 that is widespread in the injured hemisphere. Given its previously identified role as a chaperone protein, interaction of Hsp27 with actin may indicate an important function for this gene in stabilization of actin filaments in astroglia, a potentially valuable contributing factor to the known resistance of these cells to trauma-induced stress.
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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 | 0.001 | 0.001 |
| 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) | 0.001 | 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".