Paternal cannabinoid exposure altered sperm epigenetics and impaired offspring growth in mice
Male mice exposed to a CB2 receptor agonist had reduced sperm counts, altered DNA methylation patterns in sperm, and produced offspring with impaired placental development and reduced growth, demonstrating paternal epigenetic transmission.
Quick Facts
What This Study Found
JWH-133 (CB2 agonist) exposure in male mice decreased sperm count, impaired placental development, and reduced offspring growth. These effects were associated with altered DNA methylation and hydroxymethylation at imprinted genes in sperm, with the changes conserved in placenta, demonstrating epigenetic transmission from father to offspring.
Key Numbers
JWH-133 (selective CB2 agonist) reduced sperm count. Altered DNA methylation/hydroxymethylation at imprinted genes in sperm. Changes conserved in placenta. Reduced offspring growth. Impaired placental development.
How They Did This
Male mice exposed to JWH-133 (selective CB2 agonist), then assessed for sperm quality, offspring growth, and placental development. Epigenetic analysis of DNA methylation/hydroxymethylation at imprinted genes in sperm and placental tissue.
Why This Research Matters
This is the first demonstration that CB2 receptor activation in male germ cells can cause epigenetic changes transmitted to the next generation through sperm. It shifts the cannabis-pregnancy conversation from maternal-only to include paternal exposure risks.
The Bigger Picture
The focus on cannabis pregnancy risks has been almost exclusively on maternal exposure. This study shows fathers' cannabis use may also affect offspring through epigenetic sperm changes, potentially doubling the window of reproductive concern.
What This Study Doesn't Tell Us
Mouse model using a synthetic CB2-selective agonist, not cannabis or THC. The specific compound (JWH-133) may not replicate the effects of recreational cannabinoids which primarily target CB1. Epigenetic changes at imprinted genes may be species-specific.
Questions This Raises
- ?Would THC exposure (primarily CB1-mediated) produce similar paternal epigenetic effects?
- ?How long do sperm epigenetic changes persist after cannabinoid exposure stops?
- ?Could paternal cannabis use before conception affect human offspring?
Trust & Context
- Key Stat:
- First evidence: paternal cannabinoid exposure altered sperm epigenetics and impaired offspring growth
- Evidence Grade:
- Preliminary: novel finding in mice with clear molecular mechanism, but used a synthetic CB2 agonist rather than cannabis.
- Study Age:
- Published in 2019.
- Original Title:
- Paternal activation of CB2 cannabinoid receptor impairs placental and embryonic growth via an epigenetic mechanism.
- Published In:
- Scientific reports, 9(1), 17034 (2019)
- Authors:
- Innocenzi, Elisa(2), De Domenico, Emanuela(2), Ciccarone, Fabio, Zampieri, Michele, Rossi, Gabriele, Cicconi, Rosella, Bernardini, Roberta, Mattei, Maurizio, Grimaldi, Paola
- Database ID:
- RTHC-02085
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Can a father's cannabis use affect his children?
This mouse study suggests yes. CB2 receptor activation in male mice altered DNA methylation in sperm, and these changes persisted in the offspring's placenta, leading to reduced growth. This is the first evidence of cannabinoid-induced paternal epigenetic transmission.
Should men stop using cannabis before having kids?
This animal study raises the question but can't answer it definitively for humans. The changes were seen with a specific synthetic compound targeting CB2 receptors. Whether recreational cannabis produces similar paternal effects needs human research.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-02085APA
Innocenzi, Elisa; De Domenico, Emanuela; Ciccarone, Fabio; Zampieri, Michele; Rossi, Gabriele; Cicconi, Rosella; Bernardini, Roberta; Mattei, Maurizio; Grimaldi, Paola. (2019). Paternal activation of CB2 cannabinoid receptor impairs placental and embryonic growth via an epigenetic mechanism.. Scientific reports, 9(1), 17034. https://doi.org/10.1038/s41598-019-53579-3
MLA
Innocenzi, Elisa, et al. "Paternal activation of CB2 cannabinoid receptor impairs placental and embryonic growth via an epigenetic mechanism.." Scientific reports, 2019. https://doi.org/10.1038/s41598-019-53579-3
RethinkTHC
RethinkTHC Research Database. "Paternal activation of CB2 cannabinoid receptor impairs plac..." RTHC-02085. Retrieved from https://rethinkthc.com/research/innocenzi-2019-paternal-activation-of-cb2
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.