Localization of Heat Shock Proteins HSPA6 (HSP70B') and HSPA1A (HSP70-1) in Cultured Differentiated Human Neuronal Cells Following Thermal Stress
Bibliographic record
Abstract
Heat shock proteins (Hsps) are a set of highly conserved proteins that are involved in cellular repair and protective mechanisms. In order to identify stress-sensitive sites in differentiated human neuronal cells, cytoplasmic and nuclear localization of two inducible members of the HSPA (HSP70) family was investigated, namely HSPA6 (HSP70B') and HSPA1A (HSP70-1). Stably transfected SH-SY5Y neuronal cell lines were generated that express YFP-HSPA6 and YFP-HSPA1A proteins. Following differentiation, transfected SH-SY5Y cells were exposed to mild heat shock at 43째C for 20 min. Immediately following heat shock, YFP-tagged HSPA6 and HSPA1A proteins localized to centrioles in the cytoplasm and nuclear speckles that are enriched in RNA splicing factors. Subsequently, both stress proteins associated with the granular component of the nucleolus which is the site of ribosomal subunit assembly and ribosomal RNA processing. Later in the recovery period, YFP-HSPA6 protein, but not YFP-HSPA1A, localized to the periphery of nuclear speckles that are sites of RNA transcription and RNA splicing. The present results identify centrioles, nuclear speckles, and the GC component of the nucleolus as potential stress-sensitive sites in differentiated human neuronal cells. The inducible HSPA6 and HSPA1A proteins exhibit similar localization to these sites. The unique association of the HSPA6 protein with the periphery of nuclear speckles identifies this nuclear site as being stress sensitive, and suggests that the little studied HSPA6 protein may be involved in the recovery of RNA transcription and/or splicing. HSPA6 is a strictly inducible protein, whose gene is present in the human genome but not in rat and mouse. Hence current animal models of neurodegenerative diseases are lacking a potentially protective member of the HSPA family. Sequence and structural analysis revealed that HSPA6 has three additional cysteine amino acids compared to HSPA1A. One of these cysteine amino acids, located in the linker domain, is not found in any other member of the human HSPA family. Identification of stress-sensitive sites in differentiated human neuronal cells could aid the design of therapeutic approaches to protect neurons from the progression of neurodegenerative diseases.
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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) | 0.001 | 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".