{
  "id": 662095,
  "title": "Optimized AAV to express the unfolded protein response transcription factor XBP1s ameliorates Alzheimer's disease features in mouse models",
  "url": "https://urgent.news/2026/08/12/optimized-aav-to-express-the-unfolded-protein-response-transcription",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-08-12T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.11.743979v1?rss=1"
  },
  "original_language": "en",
  "account": "Alzheimer's disease is often characterized by an impairment in proteostasis at the endoplasmic reticulum (ER) level. The unfolded protein response (UPR) is a crucial pathway that helps cope with this ER stress, with the transcription factor X-Box binding protein 1 (XBP1) playing a central role in initiating repair programs. Researchers have previously demonstrated that overexpressing active XBP1 in the brains of mice and aged animals using adeno-associated vectors (AAVs) can provide protective effects.\n\nIn this study, a new vector has been generated to enable clinical testing. This vector expresses codon-optimized human XBP1s without artificial tags, restricts expression to neurons using the synapsin promoter, and incorporates a novel variant of AAV2 (AAV-TT) with enhanced biodistribution, termed Proteostaser-1. When 5xFAD mice were treated with Proteostaser-1, they showed improvements in spatial learning, synaptic plasticity, and a reduction in amyloid plaque deposition. Furthermore, when this vector was administered to a sporadic AD model based on intracerebral amyloid injection and oligomers, cognition was also improved. These findings emphasize the potential of the UPR as a strategy to alleviate AD features and maintain synaptic function.",
  "summary": "Proteostasis impairment at the level of the endoplasmic reticulum (ER) is a salient feature of Alzheimer's disease (AD). The unfolded protein response (UPR) is the main pathway to cope with ER stress, where the expression of the transcription factor X-Box binding protein 1 (XBP1) is central to establish repair programs. To artificially enforce the adaptive capacity of the UPR in the AD brain, we…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}