Targeting the Nav1.8 ion channel engenders sex-specific responses in lysophosphatidic acid–induced joint neuropathy
Bibliographic record
Abstract
Joint neuropathic pain occurs in a subset of arthritis patients, and lysophosphatidic acid (LPA) has been implicated as a mediator of joint neuropathy. The mechanism by which LPA promotes neuropathic pain is unknown but may be related to altered signalling of the voltage-gated sodium channel Nav1.8 located on nociceptors. Because arthritis and neuropathic pain are more prevalent in females, this study aimed to explore potential sex differences in the development of LPA-induced joint neuropathy and whether Nav1.8 played a role in the associated neuropathic pain. Joint neuropathy was induced in male and female Wistar rats (179-284 g) by intra-articular injection of 50-µg LPA. Pain behaviour was assessed over 21 days using von Frey hair algesiometry. On day 21, electrophysiological recordings of joint primary afferents were conducted to measure peripheral sensitisation. Saphenous nerve morphology and expression of the nerve-damage marker ATF3 and Nav1.8 in ipsilateral dorsal root ganglions were compared on the basis of sex. The analgesic properties of the selective Nav1.8 antagonist A-803467 was determined in pain behaviour and electrophysiology experiments. Females developed more severe mechanical allodynia than males after LPA treatment. Lysophosphatidic acid caused more pronounced demyelination of the saphenous nerve in females, but no sex differences were observed in the expression of ATF3 or Nav1.8 in dorsal root ganglion neurones. Blockade of Nav1.8 channels with A-803467 resulted in a decrease in joint mechanosensitivity and secondary allodynia with females exhibiting a greater response. These findings suggest that LPA has sex-specific effects on joint neuropathy and Nav1.8 gating, which should be considered when treating neuropathic arthritis patients.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.001 |
| 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) | 0.000 | 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 teacher head, 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".