THC Disrupts Placental Cell Development Through CB1 Receptor Signaling in Mouse Models
THC altered trophoblast differentiation in mouse placental stem cells through the CB1 receptor, reducing syncytiotrophoblast markers and shifting development toward other cell types, suggesting a mechanism for THC-induced placental pathology.
Quick Facts
What This Study Found
THC exposure at physiologically relevant levels significantly altered trophoblast stem cell differentiation in a CB1-dependent manner, reducing expression of syncytiotrophoblast (SynT) markers while driving differentiation toward junctional zone/trophoblast giant cell pathways. CB1 knockout cells showed no SynT marker expression. Higher non-physiological THC concentrations (15 microM) could induce SynT markers even without CB1.
Key Numbers
THC tested at physiologically relevant serum levels; CB1 expressed in all maternal blood-facing trophoblast cells; SynT markers reduced; junctional zone markers increased; 15 microM THC (non-physiological) overrode CB1 knockout.
How They Did This
In vitro study using mouse trophoblast stem cells, including CB1 knockout (Cnr1KO) cells. Assessed THC effects on differentiation markers at physiologically relevant and elevated concentrations. Examined CB1 expression across placental cell types.
Why This Research Matters
This study identifies a specific mechanism by which THC could harm placental development: diverting trophoblast differentiation away from the cell type that forms the maternal-fetal nutrient exchange interface. This could explain growth restriction observed in cannabis-exposed pregnancies.
The Bigger Picture
Cannabis use during pregnancy is increasing. This study provides mechanistic evidence for how THC might cause the placental pathology and growth restriction seen in epidemiological studies, strengthening the biological plausibility of those associations.
What This Study Doesn't Tell Us
Mouse model may not fully reflect human placental biology. In vitro differentiation does not capture the full complexity of placental development in vivo. Dose-response at physiological vs. non-physiological concentrations suggests threshold effects that need further characterization.
Questions This Raises
- ?Does this trophoblast differentiation shift occur in human placental tissue?
- ?At what THC exposure level does placental harm begin in human pregnancies?
Trust & Context
- Key Stat:
- THC shifted placental cells away from nutrient-exchange function via CB1
- Evidence Grade:
- Well-designed mechanistic mouse study with CB1 knockout controls, but in vitro and species-specific limitations.
- Study Age:
- 2025 publication
- Original Title:
- Delta 9-Tetrahydrocannabinol Signaling Through Cannabinoid Receptor 1 Alters Trophoblast Differentiation.
- Published In:
- Stem cells and development, 34(21-22), 441-455 (2025)
- Authors:
- Koven, Jessica L, Natale, Bryony V(2), Hardy, Daniel B(10), Natale, David R C
- Database ID:
- RTHC-06855
Evidence Hierarchy
Frequently Asked Questions
How does THC affect placental development?
This mouse study found THC diverts placental stem cells away from becoming syncytiotrophoblasts (the cells that handle nutrient exchange between mother and fetus) through the CB1 receptor. This could explain growth restriction in cannabis-exposed pregnancies.
Is it safe to use cannabis during pregnancy?
This study adds mechanistic evidence that THC disrupts placental cell development at physiologically relevant concentrations. Combined with epidemiological evidence of growth restriction, it supports caution about cannabis use during pregnancy.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-06855APA
Koven, Jessica L; Natale, Bryony V; Hardy, Daniel B; Natale, David R C. (2025). Delta 9-Tetrahydrocannabinol Signaling Through Cannabinoid Receptor 1 Alters Trophoblast Differentiation.. Stem cells and development, 34(21-22), 441-455. https://doi.org/10.1177/15473287251392544
MLA
Koven, Jessica L, et al. "Delta 9-Tetrahydrocannabinol Signaling Through Cannabinoid Receptor 1 Alters Trophoblast Differentiation.." Stem cells and development, 2025. https://doi.org/10.1177/15473287251392544
RethinkTHC
RethinkTHC Research Database. "Delta 9-Tetrahydrocannabinol Signaling Through Cannabinoid R..." RTHC-06855. Retrieved from https://rethinkthc.com/research/koven-2025-delta-9tetrahydrocannabinol-signaling-through
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.