Deciphering the Role of ARK5 and hnRNP A1 in Regulating the Osmotic Stress.
Bibliographic record
Abstract
Osmotic stress is a significant stressor influencing cellular responses, including the subcellular localization of the heterogeneous nuclear ribonucleoprotein (hnRNP A1), a nucleocytoplasmic-shuttling RNA-binding protein that plays a vital role in nucleic acid metabolism and gene expression regulation. The function of hnRNP A1 is determined partly by its specific location within the cell. Although some work has been done to elucidate the signalling pathways that regulate the cellular localization of hnRNP A1, the consequences and mechanisms of the altered hnRNP A1 localization still need to be fully understood. We have previously conducted an unbiased RNAi-based kinome-wide screen to identify kinases that regulate hnRNP A1 localization during osmotic stress. In this work we characterized one of the hits from this screen, AMPK-related protein kinase 5 (ARK5), as the kinase controlling hnRNP A1 subcellular localization in response to hypertonic stress. ARK5 directly phosphorylates hnRNP A1 on serine residues within the F-peptide region. In addition, the silencing of ARK5 increases the expression of the anti-apoptotic protein Bcl-xL and consequently delays caspase activation during hypertonic stress. Although ARK5 regulates cell survival through hnRNP A1, the downstream osmotic stress response genes are not known. Studies show osmotic stress activates different signaling pathways and induces expression of distinct genes. For example, hypertonic stress induces expression of the aldose reductase (AR), fibronectin 1 (FN1), and vimentin (VIM) in cells. Interestingly, ARK5 is upregulated in diabetics nephropathy (DN), which is triggered by hypertonic stress in the nephron during the early stages of DN. Therefore, we hypothesized that ARK5 might be the upstream regulatory molecule that controls the expression of the downstream osmotic stress-response genes through hnRNP A1. Our mRNA abundance and mRNA translation data suggest that the osmotic stress-response genes behave differently in different cell-types. Our data indicate that VIM, and partially FN1, are increased during the osmotic stress response; however, this regulation is not controlled by ARK5.
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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".