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NIDA

Basic Science

Animal Study Suggests Marijuana May Affect Future Offspring’s Susceptibility to Heroin

Can marijuana use put offspring at heightened risk for opiate addiction, even if the use stops before the offspring are conceived? Results from a recent NIDA-funded study are consistent with other studies suggesting that a parent’s history of drug use, even preconception, may affect a child’s brain function and behavior.

Study Assesses Functional Deficits Due to HIV and Methamphetamine Use

Methamphetamine use and HIV infection raise the risk for functional dependence, or the need for assistance with everyday tasks. People who use methamphetamine and are HIV positive showed the highest levels of functional dependence in most domains of daily life.

Animation: The Rise and Fall of the Cocaine High

This animation shows the rapid passage of cocaine through the brain. It demonstrates that the intensity of the cocaine “high” parallels the trajectory of cocaine levels in the brain.

A Genetic Nexus of Obesity and Smoking

Research shows that some gene variants that influence body mass index also shape smoking behaviors.

Dr. Antonello Bonci Q & A: Lighting Up the Brain To Shut Down Cocaine Seeking

The Scientific Director of NIDA’s Intramural Research Program talks about switching off animals’ compulsive cocaine seeking by optogenetically activating the prefrontal cortex, and the implications of this work for people. In an accompanying podcast, Dr. Bonci walks viewers through experiments that showed that prefrontal cortex activity levels may constitute a simple switch controlling whether or not animals compulsively seek cocaine.

Gene Variants Reduce Opioid Risks

Two recent studies suggest that genotyping may enable clinicians to base therapies on individual patients’ potential responsiveness to opioid drugs’ therapeutic effects and vulnerability to their harmful effects.

New Insight Into How Cues Cause Relapse to Cocaine

A brain response occurs in the nucleus accumbens when rats encounter a cue that they associate with previous cocaine self-administration, but not a cue associated with a pleasurable non-drug experience. Moreover, the response correlates in time and intensity with the animals’ cue-induced relapse to cocaine-seeking.

Methamphetamine Alters Brain Structures, Impairs Mental Flexibility

Methamphetamine alters brain structures involved in decision-making and impairs the ability to suppress habitual behaviors that have become useless or counterproductive. The two effects were correlated, indicating that the structural change underlies the decline in mental flexibility.

Stress-Induced Enzyme Compounds Methamphetamine Neurotoxicity

Ketoprofen, an anti-inflammatory agent commonly prescribed to treat arthritis, reduces neuronal damage in rats that have been exposed to chronic stress and methamphetamine. If this finding of a recent NIDA-supported study extrapolates to humans, anti-inflammatory medications may gain a place in the treatment of methamphetamine addiction.

Study Finds Genetic Influence on African Americans’ Smoking

A meta-analysis of 13 genome-wide association studies of African Americans’ smoking patterns confirms the significance of genetic variation in region 15q25.1. The analysis also tentatively implicates several genome locations that have not previously been associated with smoking behaviors.

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