{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T16:59:32Z","timestamp":1790441972230,"version":"4.1.0"},"posted":{"date-parts":[[2026,9,23]]},"group-title":"Neuroscience","reference-count":70,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:00:00Z","timestamp":1790121600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.biorxiv.org\/about\/FAQ#license"}],"funder":[{"award":["DA054610"],"award-info":[{"award-number":["DA054610"]}],"id":[{"id":"https:\/\/ror.org\/01cwqze88","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2026,9,23]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                <jats:p>\n                  A growing body of evidence demonstrates that signaling pathways of endogenous lipids (endolipids) modulate the reinforcing properties of opioids including reward and withdrawal. Many of these studies are focused on the endocannabinoid (eCB) system, and its primary eCB ligands, Anandamide (AEA) and 2-arachidonoylglycerol (2-AG). The central hypothesis is that modulation of the eCB system through eCB receptors and enzymes may improve therapeutic outcomes for opioid use disorder (OUD). However, outcomes in preclinical and clinical studies using the low efficacy, CB1\/CB2 orthosteric agonist, THC, found limited to no effectiveness, suggesting that targeting this aspect of CB1\/CB2 is not a useful therapeutic tool for OUD. Previous studies finding that genetic deletion or pharmacological inhibition of endolipid-regulating enzymes (including eCBs) can alter behavioral sensitivity to opioids provide insight into an alternative approach. If opioid use dysregulates a wide range of endolipid biosynthesis and metabolism, then a clearer understanding of these changes, especially in signaling ligands, will provide a novel avenue to both understand the underlying physiological changes with opioid use as well as providing novel targets for therapeutic interventions. In this study, we tested the hypothesis that if morphine dysregulates multiple endolipid signaling systems in the brain and body, and this dysregulation evolves over time, then these differential effects will be measurable by changes in endolipid levels. Using an Acute (30 minutes post injection 20mg\/kg) and a Chronic paradigm (5 days, twice daily, 20mg to 100mg\/kg escalating dose) we measured 100 targeted endolipids in 8 brain regions, plasma, liver, and feces in male mice. In the Acute condition, we found that the most screened endolipids were changed in the striatum (42%), while the fewest were changed in the thalamus (19%) and 38% in the plasma. In the Chronic condition, 79% of plasma endolipids were changed. The highest level of change in the CNS was in the cortex (39%). Levels of AEA and 2-AG were largely unchanged; however, levels of the\n                  <jats:italic>N<\/jats:italic>\n                  -acyl GABAs,\n                  <jats:italic>N<\/jats:italic>\n                  -acyl valines,\n                  <jats:italic>N<\/jats:italic>\n                  -acyl taurines, and specific bile acids (\n                  <jats:italic>e.g.<\/jats:italic>\n                  DCA, TCA) showed the most dynamic changes by treatment group. These results provide information on novel endolipid signaling pathways that may contribute to the unwanted side effects of opioids, such as dependence and withdrawal, and provide novel avenues for the development of therapeutic strategies.\n                <\/jats:p>","DOI":"10.64898\/2026.09.17.752401","type":"posted-content","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T20:35:17Z","timestamp":1790195717000},"source":"Crossref","is-referenced-by-count":0,"title":["Morphine causes distinct changes in the lipidome throughout the brain and body after acute or chronic administration: implications for novel endogenous lipid signaling systems involved in opioid reward and withdrawal"],"prefix":"10.64898","author":[{"given":"Taylor J","family":"Woodward","sequence":"first","affiliation":[{"name":"Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, United States"},{"name":"Gill Institute for Neuroscience, Indiana University, Bloomington, IN, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elyse","family":"Chafee","sequence":"additional","affiliation":[{"name":"Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Evan","family":"Cannon","sequence":"additional","affiliation":[{"name":"Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clarissa","family":"Schmitt","sequence":"additional","affiliation":[{"name":"Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ken","family":"Mackie","sequence":"additional","affiliation":[{"name":"Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, United States"},{"name":"Gill Institute for Neuroscience, Indiana University, Bloomington, IN, United States"},{"name":"Program in Neuroscience, Indiana University, Bloomington, IN, United States"},{"name":"Center for Cannabis, Cannabinoids, and Addiction, Bloomington, IN, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7983-5729","authenticated-orcid":false,"given":"Heather B","family":"Bradshaw","sequence":"additional","affiliation":[{"name":"Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, United States"},{"name":"Program in Neuroscience, Indiana University, Bloomington, IN, United States"},{"name":"Center for Cannabis, Cannabinoids, and Addiction, Bloomington, IN, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"54368","reference":[{"issue":"1","key":"2026092609400654000_2026.09.17.752401v1.1","doi-asserted-by":"crossref","first-page":"52","DOI":"10.1186\/s12954-024-00964-5","article-title":"They make it too hard and too many hoops to jump\u201d: system and organizational barriers to drug treatment during epidemic rates of opioid overdose","volume":"21","year":"2024","journal-title":"Harm Reduct J"},{"key":"2026092609400654000_2026.09.17.752401v1.2","doi-asserted-by":"crossref","unstructured":"Ayoub, S.M. , et al., Spontaneous and Naloxone-Precipitated Withdrawal Behaviors From Chronic Opiates are Accompanied by Changes in N-Oleoylglycine and N-Oleoylalanine Levels in the Brain and Ameliorated by Treatment With These Mediators. 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