THC Vaping During Pregnancy Induces Changes in Structural and Functional Connectivity in Offspring

Why It Matters

The study signals that prenatal THC vaping can cause lasting brain and behavioral deficits, prompting urgent public‑health guidance and research into protective interventions.

Key Takeaways

• Cannabis is most used substance during U.S. pregnancy, rising use
• Vaped THC crosses placenta, reaches fetal brain, unknown long‑term effects
• Prenatal THC exposure caused permanent hyperactivity, motor deficits in adult mice
• Imaging showed disrupted white matter and widespread brain hyperconnectivity
• Neuroimmune shift observed: higher inflammation, fewer regulatory brain cells

Summary

The presentation by Dr. Natra Madurai of Johns Hopkins Children’s Center outlines a new study on how vaping THC during pregnancy permanently alters brain structure and function in offspring. The work, slated for the International Hershey Conference on Developmental Brain Injury, addresses the growing clinical concern that cannabis is now the most commonly used substance among pregnant people in the United States.

Using a rodent model that mimics real‑world vaporized THC exposure from gestation through early post‑natal life, the investigators tracked animals into adulthood. They observed persistent hyperactive behavior and motor impairments that did not resolve over time. Advanced MRI revealed disrupted white‑matter development and widespread hyperconnectivity across networks governing attention and cognitive flexibility.

Molecular analyses showed a pro‑inflammatory shift: elevated cytokines, reduced protective factors, and fewer regulatory immune cells in the brain. Dr. Madurai emphasized that these neuroimmune changes may underlie the observed behavioral and imaging phenotypes, highlighting a mechanistic link between prenatal THC exposure and lasting neurodevelopmental injury.

The findings suggest that prenatal THC exposure carries long‑term neurodevelopmental risks, underscoring the need for human studies, public‑health education, and potential therapeutic strategies targeting neuroimmune pathways. As cannabis legalization expands, the research provides critical evidence for clinicians and policymakers to reassess safety assumptions about cannabis use in pregnancy.

Original Description

Nethra Madurai, neonatologist at Johns Hopkins Children’s Center, discusses her research, In Need of Neuromodulation: THC Vaping During Pregnancy Induces Permanent Changes in Structural and Functional Connectivity in Offspring, presented during the 15th annual Hershey Conference on Developmental Brain Injury. In this study, Madurai and team researched the effects of vaporized THC throughout development during pregnancy and into the early postnatal period. Learn more at https://www.hopkinsmedicine.org/hershey #researchsaveschildren