---
title: "Macrophage CYP3A4 Expression and Cocaine-Induced Catalytic Activation"
id: "biorxiv-3-primary-human-macrophages-exhibit-functional-cyp3a4-activity-with-marked"
canonical_url: "https://medichelpline.com/clinical-feed/biorxiv-3-primary-human-macrophages-exhibit-functional-cyp3a4-activity-with-marked"
content_type: "clinical_feed_article"
specialty: "Pharmacology"
source_name: "bioRxiv (Biomedical Preprints)"
source_url: "https://www.biorxiv.org/content/10.64898/2026.10.21.760694v1?rss=1"
published_at: "2026-10-25T12:00:00.000Z"
evidence_level: "Verified Feed"
license: "CC-BY-NC-4.0 / Informational Use"
---
# Macrophage CYP3A4 Expression and Cocaine-Induced Catalytic Activation
## Provenance & Clinical Metadata
- **Canonical URL:** https://medichelpline.com/clinical-feed/biorxiv-3-primary-human-macrophages-exhibit-functional-cyp3a4-activity-with-marked
- **Specialty:** [Pharmacology](https://medichelpline.com/clinical-feed/pharmacology.md)
- **Primary Source:** bioRxiv (Biomedical Preprints)
- **Source URL:** [Original Journal Publication](https://www.biorxiv.org/content/10.64898/2026.10.21.760694v1?rss=1)
- **Published At:** 2026-10-25T12:00:00.000Z
- **Evidence Rating:** Verified Feed
## Executive GIST (TL;DR)
- Investigators used primary human monocyte-derived macrophages drawn from 100 independent donors to probe extrahepatic drug metabolism. - The cohort expressed **CYP3A4** and the transcriptional regulator Pregnane X Receptor (**PXR**); the source text also lists a truncated regulator name beginning “Constitutive An,” but the full name and details were not reported in the provided text. - Data indicated a discordance between enzyme expression and catalytic function; the authors described this as a marked expression–function mismatch rather than a one-to-one relationship. - The study team observed **cocaine-linked catalytic activation** of macrophage CYP3A4 activity; precise activation metrics, assay conditions, and dosing were not reported in the truncated source. - Authors framed primary macrophages as an understudied extrahepatic reservoir of CYP3A4-mediated metabolism, with possible implications for xenobiotic handling by immune cells. - The article is a preprint on bioRxiv and has not been peer-reviewed; methodological specifics beyond cell source and donor count (for example, assay methods, substrates used, quantitative results, and statistical analyses) were not available in the provided excerpt. - The source did not report full experimental parameters, including exact catalytic assays, time courses, or cocaine exposure regimens; these omissions limit immediate translational interpretation. - The study raises questions about intra-individual variation in macrophage metabolism and the potential for drug–drug or drug–substance interactions within immune compartments that merit follow-up work.
## Clinical Analysis & Structured Key Points
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Price, Stephen A. Knerler Jr., [ View ORCID Profile](http://orcid.org/0000-0002-3977-1019)Rodnie Colón Ortiz, Jareb J. Perez-Caraballo, [ View ORCID Profile](http://orcid.org/0000-0003-4419-6538)Alysha L. Ellison, [ View ORCID Profile](http://orcid.org/0000-0003-3350-2835)Cory J. White, [ View ORCID Profile](http://orcid.org/0000-0002-7394-0680)José Javier Rosado-Franco, [ View ORCID Profile](http://orcid.org/0000-0003-2682-4713)Hannah N. Wilkins, [ View ORCID Profile](http://orcid.org/0009-0007-3004-7407)Alicia Mercado, Kiara Mehta, [ View ORCID Profile](http://orcid.org/0009-0000-5060-4820)Oluwatofunmi Oteju, [ View ORCID Profile](http://orcid.org/0000-0002-4208-6426)Parker Stevenson-Li, [ View ORCID Profile](http://orcid.org/0000-0001-7014-0955)Kimberly S. Williams, [ View ORCID Profile](http://orcid.org/0000-0003-0095-5424)Peter J. Gaskill, [ View ORCID Profile](http://orcid.org/0000-0001-5029-2628)Dionna W. Williams doi: https://doi.org/10.64898/2026.10.21.760694 This article is a preprint and has not been certified by peer review [[what does this mean?](https://www.biorxiv.org/about/FAQ#unrefereed)]. Amira S. Price 1 Emory University School of Medicine; * [Find this author on Google Scholar](https://www.biorxiv.org/lookup/google-scholar?link_type=googlescholar&gs_type=author&author%5B0%5D=Amira%2BS.%2BPrice%2B "Open in new tab") * [Find this author on PubMed](https://www.biorxiv.org/lookup/external-ref?access_num=Price%20AS&link_type=AUTHORSEARCH "Open in new tab") * [Search for this author on this site](https://www.biorxiv.org/search/author1%3AAmira%2BS.%2BPrice%2B) * [ORCID record for Amira S. Price](http://orcid.org/0000-0003-4454-7270 "Open in new tab") Stephen A. 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Williams 1 Emory University School of Medicine; * [Find this author on Google Scholar](https://www.biorxiv.org/lookup/google-scholar?link_type=googlescholar&gs_type=author&author%5B0%5D=Dionna%2BW.%2BWilliams%2B "Open in new tab") * [Find this author on PubMed](https://www.biorxiv.org/lookup/external-ref?access_num=Williams%20DW&link_type=AUTHORSEARCH "Open in new tab") * [Search for this author on this site](https://www.biorxiv.org/search/author1%3ADionna%2BW.%2BWilliams%2B) * [ORCID record for Dionna W. Williams](http://orcid.org/0000-0001-5029-2628 "Open in new tab") * For correspondence: dionna.whitney.williams@emory.edu * [Abstract](https://www.biorxiv.org/content/10.64898/2026.10.21.760694v1)[](https://www.biorxiv.org/panels_ajax_tab/biorxiv_tab_art/node:5901374/1) * [Info/History](https://www.biorxiv.org/content/10.64898/2026.10.21.760694v1.article-info)[](https://www.biorxiv.org/panels_ajax_tab/biorxiv_tab_info/node:5901374/1) * [Metrics](https://www.biorxiv.org/content/10.64898/2026.10.21.760694v1.article-metrics)[](https://www.biorxiv.org/panels_ajax_tab/article_tab_metrics/node:5901374/1) * [Supplementary material](https://www.biorxiv.org/content/10.64898/2026.10.21.760694v1.supplementary-material)[](https://www.biorxiv.org/panels_ajax_tab/biorxiv_tab_data/node:5901374/1) * [ Preview PDF](https://www.biorxiv.org/content/10.64898/2026.10.21.760694v1.full.pdf+html)[](https://www.biorxiv.org/panels_ajax_tab/biorxiv_tab_pdf/node:5901374/1) ![Loading](https://www.biorxiv.org/sites/all/modules/contrib/panels_ajax_tab/images/loading.gif) ## Abstract CYP3A4 is a phase I drug-metabolizing enzyme responsible for transformation of ~50% of clinically relevant drugs. While extensively characterized in hepatocytes, its role in immune cells remains poorly understood. Here, using primary human monocyte-derived macrophages, we identify an understudied extrahepatic site of CYP3A4-mediated drug metabolism. Macrophages from 100 independent donors expressed CYP3A4 and its transcriptional regulators, Pregnane X Receptor (PXR) and Constitutive An
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