Injecting glial cell line-derived neurotrophic factor (GDNF) into the brains of cannabis-addicted rats reduced anxiety, reversed abnormal sperm morphology, decreased sperm DNA damage, and improved sperm viability.
Reproductive biology researchers, addiction neuroscientists, and fertility specialists.
GDNF reduced cannabis-induced sperm DNA damage (p=0.0242)
What the researchers found
Cannabis-addicted rats showed increased anxiety, reduced germ cells, smaller testes/epididymis, altered sperm morphology, and increased DNA damage. GDNF treatment improved anxiety (p<0.05), reversed abnormal sperm morphology, improved sperm grading (grade C, p=0.0295), reduced DNA damage (p=0.0242), and enhanced viability. GDNF had limited effect on testis/epididymis size or germ cell counts.
Why it matters
Cannabis use is linked to male fertility problems, and GDNF is a key factor in spermatogenesis. This study shows GDNF can partially reverse cannabis-induced reproductive damage while also improving addiction-related behavior, suggesting a dual therapeutic target.
The numbers in context
15 rats; cannabis reduced germ cells (p=0.0006) and organ size (p=0.003); GDNF reversed sperm morphology (p=0.0016), grade C sperm (p=0.0295), DNA damage (p=0.0242).
How the study worked
15 male Wistar rats in 3 groups: control, cannabis-addicted, and cannabis-addicted + GDNF. Cannabis addiction induced via smoking machine (0.25g per 5 rats). GDNF delivered by stereotaxic brain injection (0.5mg). Behavioral tests (elevated plus maze, open field, sucrose preference) and sperm analysis (morphology, DNA damage, viability).
What this study cannot tell us
Very small sample (5 per group). Stereotaxic brain injection is not clinically practical. Cannabis delivery via smoking machine may not replicate human use patterns. Short intervention period. Male rats only.
How to read the evidence
Novel finding with dual behavioral and reproductive outcomes, but very small sample and invasive delivery method limit translation.
When this study was published
2025 animal study exploring GDNF as a dual-target therapy for cannabis addiction and fertility.
The bigger picture
The connection between brain GDNF levels and both addiction behavior and fertility opens a novel research avenue. If these findings translate, GDNF-targeted therapies could address two consequences of cannabis addiction simultaneously.
Questions still open
- Could peripheral GDNF administration achieve similar effects?
- Are these findings relevant to human cannabis users with fertility concerns?
Common questions
Does cannabis affect male fertility?
Can the fertility damage from cannabis be reversed?
Read the original research
Assessment of addiction behavior and spermatogenesis in glial cell line-derived neurotrophic factor-treated cannabis-addicted rats: An experimental study.
International journal of reproductive biomedicine, 23(2), 153-170
Citation
Laleh, Rozhina; Nasrabadi, Mitra Heydari; Khodarahmi, Parvin; Soltani, Jamshid. (2025). Assessment of addiction behavior and spermatogenesis in glial cell line-derived neurotrophic factor-treated cannabis-addicted rats: An experimental study.. International journal of reproductive biomedicine, 23(2), 153-170. https://doi.org/10.18502/ijrm.v23i2.18487
Explore the wider topic
- Physical vs Psychological Cannabis Dependence: What Science Actually Shows
- The Gap Between Cannabis Perception and Science: Why What We Believe Outpaces What We Know
- Cannabis Use Disorder: Am I Addicted? Self-Assessment Guide
- Cross-Addiction After Quitting Weed: When One Habit Replaces Another
- Is Weed Addictive? What the Research Actually Shows
- Is Cannabis Addictive? What the DSM-5 and Brain Science Say
- Quitting Weed and Alcohol Together: What to Know About Dual Cessation
- Is Rehab Necessary for Weed? An Honest Assessment
- Signs You May Have Cannabis Use Disorder: An Honest Self-Assessment
- Weed Vape Pen Addiction: Why Vaping Makes It Harder to Quit