Mitochondria in the Brain’s Reward Hub Drive Nicotine Dependence – Neuroscience News

UCF neuroscientists study how nicotine alters brain mitochondria in the nucleus accumbens to discover more effective addiction therapies.. Mitochondria in the Brain’s Reward Hub Drive Nicotine Dependence – Neuroscience News Researchers at the University of Central Florida are exploring how mitochondrial alterations in nucleus accumbens neurons drive compulsive drug-seeking behavior. Credit: Neuroscience NewsMitochondria in the Brain’s Reward Hub Drive Nicotine Dependence FeaturedNeurosciencePsychology·September 26, 2026Summary: Supported by a $943,000 NIH grant, neuroscientists at the University of Central Florida are investigating how nicotine alters neuronal mitochondria within the nucleus accumbens.

By examining the subcellular mechanisms that drive drug-seeking behavior, researchers aim to identify new molecular targets to treat nicotine use disorder and other addictions. Key Facts: Focus on the Brain’s Reward “Computer”: The investigation targets the nucleus accumbens, a key forebrain structure that integrates reward learning signals from across the brain to guide decision-making and compulsive behavior. Mitochondria Beyond Cellular Energy: Rather than viewing mitochondria solely as cellular power plants, the research explores how they regulate inter-neuronal communication, gene transcription, and steroid hormone production during drug exposure.

Surging Nicotine Pouch Consumption: The project addresses an evolving nicotine landscape; FDA/CDC National Youth Tobacco Survey data shows that youth use of oral nicotine pouches nearly quadrupled between 2022 and 2025. Source: University of Central Florida (UCF) Even as conventional cigarette smoking drops to historic lows, public health faces an evolving spectrum of nicotine delivery systems. The rapid proliferation of electronic cigarettes and oral nicotine pouches, the latter nearly quadrupling in popularity among U.S. youth and young adults between 2022 and 2025, demonstrates how addiction adapts to new commercial formats.

Yet despite decades of behavioral research, therapeutic interventions for nicotine use disorder remain limited in efficacy, offering lasting relief to only a subset of patients while frequently carrying adverse side effects. To uncover more precise therapeutic pathways, Dr. Cali Calarco, an assistant professor at the University of Central Florida’s Burnett School of Biomedical Sciences, is investigating the precise molecular and subcellular mechanisms that govern drug-seeking actions.

Backed by a five-year, $943,000-plus K01 grant from the National Institute on Drug Abuse (NIDA), her laboratory is analyzing how neurons reshape their internal architecture in response to prolonged drug exposure. “We want to understand what’s really influencing the neuron,” said Dr. “Which component is critical for the neuron function that leads to drug-seeking behavior?” The Nucleus Accumbens and Mitochondrial Dynamics Calarco’s research centers on the nucleus accumbens, a primary node within the mesolimbic dopamine pathway that governs reinforcement learning, incentive salience, and behavioral choice.

“I call it a little computer that integrates a lot of signals that come in relationship to reward learning from a lot of other parts of the brain to guide behavioral choices,” Calarco explained. Rather than treating the nucleus accumbens as a homogeneous structure, the lab investigates how distinct subpopulations of neurons react when exposed to nicotine. Central to this inquiry is an organelle often sidelined in classic neurocircuitry studies: the mitochondrion.

While long recognized as essential energy providers in metabolically demanding brain cells, mitochondria also fulfill vital signaling roles that dictate neuronal plasticity. “Mitochondria have been underappreciated in neurons previously,” Calarco said. “Neurons are incredibly complex cells that do incredibly complex tasks, both electrically and chemically that require a ton of energy, so we knew they were really important.

But mitochondria also influence how neurons communicate with each other. They’re super important for gene transcription and translation and for steroid hormone production.” From Cellular Bioenergetics to Targeted Therapies Building on earlier postdoctoral investigations at the University of Maryland, Baltimore—where she studied mitochondrial alterations underlying cocaine-seeking behavior—Calarco’s current models track how nicotine modifies mitochondrial morphology, trafficking, and metabolic signaling in real time. By pinpointing which molecular signaling pathways become dysregulated during chronic substance use, researchers hope to design pharmacotherapies that target neural pathology directly, avoiding the blunt systemic effects common to traditional treatments.

“There aren’t that many substance use disorder treatments, and the ones available only work for a subset of people,” Calarco noted. “There is room for improvement in nicotine use disorder therapies, and new pathway targets may provide more effective treatments with fewer side effects.” Furthermore, because reward-learning circuitry in the nucleus accumbens relies on conserved molecular pathways, discovering how mitochondria shape reinforcement could yield broader clinical applications—informing treatments for other substance use disorders as well as compulsive behavioral dependencies. Editorial Notes: This article was edited by a Neuroscience News editor.

Journal paper will be reviewed in full upon release.

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