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Heads of Laboratories

Head shot of Bruce McEwen
Bruce S. McEwen, Ph.D.
Alfred E. Mirsky Professor
Harold and Margaret Milliken Hatch Laboratory of Neuroendocrinology

Throughout life, hormones alter behavior and mood, regulate neuroendocrine activity, protect the brain from stress, and regulate brain aging and certain disease processes. Dr. McEwen’s laboratory takes an interdisciplinary approach to investigate how stress and sex hormones act on the brain. His work has wide-ranging implications for understanding how the brain changes, from development through adult life.

The neuroendocrine system links behavior and experience with hormone secretion. In turn, hormones regulate functions such as reproduction, fluid and mineral balance, metabolism, and immune activity. They also help shape the developing brain, affect mood and behavior, and contribute to aging and disease.

By studying the cellular and molecular mechanisms underlying the effects of stress and sex hormones on the hippocampus and other regions of the adult and developing brain, the McEwen laboratory has helped create a new understanding of how the brain changes in adult life and in development, with implications for understanding the impact of stress on the brain and sex differences in human brain function, as well as in Alzheimer’s disease, depression, posttraumatic stress disorder, and normal aging.

In relation to stress, the McEwen lab has found that hormone actions on structural plasticity are intertwined with the actions of excitatory amino acid transmitters, NMDA receptors, other neurotransmitters, and BDNF. Dr. McEwen has found that, in the dentate gyrus, chronic stress reduces neuron number. In the hippocampus, chronic stress causes neurons to undergo remodeling of dendrites. Excitatory amino acids are important regulators of neuronal remodeling, acting in concert with glucocorticoids. Stress-induced remodeling is largely reversed once the stress is removed, although gene expression patterns continually change with experience and resilience declines with aging.

The hippocampus is involved in the formation of episodic, spatial, and contextual memories and is one of the first brain structures to degenerate in Alzheimer’s disease. The McEwen lab has recently shown that age-related impairment of cognitive function can be reduced by treatment with riluzole, a drug that reduces glutamate overflow.

In relation to sex hormone action, the McEwen lab has identified sex hormone receptors in the hippocampus that regulate signaling pathways associated with synapse formation and maturation. These “nongenomic” forms of the classical sex hormone receptors work in concert with the more classical genomic actions of sex hormones on gene expression, and they increase excitatory synapse formation and exert neuroprotective effects in the hippocampus and other brain regions.

The McEwen lab has recently expanded its scope of study to investigate stress-induced structural remodeling in the amygdala, which is involved in fear and strong emotions, and the prefrontal cortex, which is involved in working memory, self-regulation, and extinction of fear learning. In animals, aging leads to loss of the ability to promptly extend dendrites of the prefrontal cortex after cessation of stress.

Work by the Neuroimmune-Physiology Program, headed by Karen Bulloch, discovered dendritic-like cells in the brain that are activated by interferon-γ to present antigens. These cells increase in number in the aging brain and are activated by viral infections and simulated stroke.


A.B. in chemistry, 1959
Oberlin College

Ph.D., 1964
The Rockefeller University


Institute of Neurobiology, Gothenburg, 1964–1965


Assistant Professor, 1966
University of Minnesota

Assistant Professor, 1966–1971
Associate Professor, 1971–1973
Associate Professor with Tenure, 1973–1981
Professor, 1981–
Associate Dean for Graduate and Postgraduate Studies, 1985–1991
Dean, Graduate and Postgraduate Studies, 1991–1993
The Rockefeller University


Dale Medal, British Endocrine Society, 2001

Pasarow Award, 2005

Goldman-Rakic Prize, National Alliance for Research for Schizophrenia and Depression, 2005

Karl Spencer Lashley Award, American Philosophical Society, 2005

Gold Medal, Society for Biological Psychiatry, 2009

Fondation IPSEN Prize in Neuronal Plasticity, 2010

Edward M. Scolnick Prize in Neuroscience, 2011


National Academy of Sciences
National Academy of Medicine
American Academy of Arts and Sciences
Fellow, American Association for the Advancement of Science


Waters, E.M. et al. G-protein-coupled estrogen receptor 1 is anatomically positioned to modulate synaptic plasticity in the mouse hippocampus. J. Neurosci. 35, 2384–2397 (2015).

Nasca, C. et al. Mind the gap: glucocorticoids modulate hippocampal glutamate tone underlying individual differences in stress susceptibility. Mol. Psychiatry 20, 755–763 (2015).

Pereira, A.C. et al. Glutamatergic regulation prevents hippocampal-dependent age-related cognitive decline through dendritic spine clustering. Proc. Natl. Acad. Sci. U.S.A. 111, 18733–18738 (2014).

Gray, J.D. et al. Hippocampal gene expression changes underlying stress sensitization and recovery. Mol. Psychiatry 19, 1171–1178 (2014).

D’Agostino, P.M. et al. Brain dendritic cells: biology and pathology. Acta Neuropathol. 124, 599–614 (2012).

Dr. McEwen is a faculty member in the David Rockefeller Graduate Program and the Tri-Institutional M.D.-Ph.D. Program.