Glyoxal is a superior fixative to formaldehyde in promoting antigenicity and structural integrity in murine cardiac tissues
Bibliographic record
Abstract
Background: Immunofluorescence (IF) is an essential technique for evaluating histological and biochemical changes in tissue specimens. A critical step in IF is sample fixation, typically achieved using formaldehyde-based fixatives, such as 4 % paraformaldehyde (PFA) or 10 % formalin. However, these fixatives are prone to over-fixation, which can alter antigenicity and promote artifacts. This study investigated glyoxal, a two‑carbon dialdehyde, as a potential alternative fixative for murine cardiac tissues for IF and crosslinking immunoprecipitation-mass spectrometry (xIP-MS) applications. Methods: Various concentrations and fixation durations of glyoxal were compared with 4 % PFA. Tissue structural integrity was assessed using Hematoxylin and Eosin (H&E) staining, while antigen preservation in cardiomyocytes was evaluated through fluorescent microscopy. Immunofluorescence of cardiac resident cells, including cardiac fibroblasts, smooth muscle cells, and endothelial cells were also investigated. xIP-MS assays were carried by phospholamban (PLN) immunoprecipitation in glyoxal-fixed mouse hearts, followed by mass spectrometry analysis. Results: Glyoxal showed comparable preservation of cardiac tissue architecture and myofiber integrity to PFA, but with superior antigen retention and protein detection. Fluorescent imaging was performed for sarcoplasmic reticulum markers (SERCA2 and PLN), intercalated disc proteins (N-Cadherin and Cx43), and contractile proteins (F-Actin and MyHC). Quantitative image analysis confirmed that glyoxal enhanced antibody penetration in thicker tissues (30 μm) and maintained the antigenicity of various cardiac resident cell markers. Glyoxal fixation allowed for xIP-MS by lightly crosslinking PLN with its associated protein complexes, enabling the identification of novel PLN-interacting proteins in mouse hearts. Conclusion: Our findings underscore the utility of glyoxal as a superior alternative to PFA in cardiac biochemistry research, offering improvements in the preservation of tissue morphology, antigen detection, and protein complex conservation in murine cardiac tissues.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| 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) | 0.002 | 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".