Health depends upon proper regulation of circadian rhythms of cell and organ functions. Disruption of circadian rhythms has detrimental consequences for brain function and resilience and abnormal circadian rhythms are a common feature of Alzheimer’s disease. In this episode neurology professor Erik Musiek talks about the roles of specific circadian clock proteins in neurons and glial cells in brain health and Alzheimer’s disease. His research is revealing the ways in which these circadian regulatory proteins affect brain cell functions and how disruption of circadian rhythms may contribute to the neuropathological features of Alzheimer’s disease (amyloid plaques and neurofibrillary tangles. We also talk about ways in which we can bolster our circadian rhythms by sleep, exercise, diet, light exposure, etc.

LINKS

Professor Musiek’s webpage: https://physicians.wustl.edu/people/erik-musiek-md-phd/

Articles discussed in this podcast:

https://pmc.ncbi.nlm.nih.gov/articles/PMC12352436/pdf/nihms-2097957.pdf

https://pmc.ncbi.nlm.nih.gov/articles/PMC11996435/pdf/nihpp-2025.03.31.645805v1.pdf

https://www.nature.com/articles/s43587-025-00950-x

https://pmc.ncbi.nlm.nih.gov/articles/PMC9008766/pdf/nihms-1794994.pdf

Chronic uncontrolled stress is a risk factor for many different diseases including mental and neurodegenerative disorders. The effects of such stress on the brain differ considerably between females and males. However, the vast majority of preclinical studies in animal models have included only males which in some cases has resulted in therapeutic interventions that are less effective in females compared to males. In this episode Georgia Hodes talks about sex differences in the effects of stress on the brain and neuroendocrine systems and how these differences can influence disease processes and treatments.

LINKS

Prof. Hodes webpage at VT:

https://neuroscience.vt.edu/our-people/research-faculty/hodes-georgia.html

Review articles:

https://pmc.ncbi.nlm.nih.gov/articles/PMC10845083/pdf/CN-22-475.pdf

https://pmc.ncbi.nlm.nih.gov/articles/PMC10189838/pdf/nihms-1896436.pdf

https://pmc.ncbi.nlm.nih.gov/articles/PMC8630768/pdf/nihms-1528739.pdf

In stressful situations the brain communicates with the adrenal glands stimulating them to release adrenaline and cortisol. This stress responsive neuroendocrine system plays important adaptive roles by regulating energy metabolism, attention, and learning and memory. However, without a recovery period chronic uncontrolled stress such as psychosocial stress can damage neural circuits in the brain and contribute to a range of mental disorders as well as Alzheimer’s disease. In this episode I have the pleasure of talking with two pioneers in the field of stress research – Professors Marian Joëls and Ron de Kloet. Their work which spans five decades has shown how two different cortisol receptors determine how the brain responds to physiological and pathological stress. They have revealed how a “cortisol switch” determines brain vulnerability or resilience.

Links

Marian Joëls’ webpage: https://www.rug.nl/staff/m.joels/cv

Ron de Kloet publications on Google Scholar: https://scholar.google.com/citations?user=Eao7yZIAAAAJ&hl=en&oi=ao

The “Cortisol Switch”

file:///Users/markmattson/Downloads/s41380-022-01934-8.pdf

https://www.sciencedirect.com/science/article/pii/S0091302218300116?via%3Dihub

Clearly demonstrated as being effective for cardiovascular disease, lifestyle medicine is becoming an important discipline for the prevention and treatment of age-related brain disorders including Alzheimer’s and Parkinson’s diseases. In this episode I talk with Dr. Josh Helman about his experience working with patients at lifestyle medicine centers. He provides his views on what people can do now to reduce their risk for these brain disorders, and what the future holds in terms of therapeutic interventions.

LINKS

Dr. Helman’s webpage: https://drjosh.com/

Lifestyle medicine approach: https://pmc.ncbi.nlm.nih.gov/articles/PMC10907160/pdf/main.pdf

The calcium ion controls neuronal network activity, synapse function and synaptic plasticity, and is a fundamental mediator of learning and memory. With aging and much more so in Alzheimer’s disease the ability of neurons to properly regulate their intracellular calcium levels becomes compromised. Evidence from human and laboratory animal studies have provided compelling evidence that excessive elevation of calcium levels in neurons results in their dysfunction and degeneration in Alzheimer’s disease, as well as in Parkinson’s disease, and stroke. In this episode, I talk with Professor Beth Stutzmann about her research which has advanced an understanding about how calcium regulation becomes disrupted in neurons in Alzheimer’s disease. Her findings point to excessive release of calcium from intracellular pools (in the endoplasmic reticulum) as being particularly important in Alzheimer’s. This research points to new therapeutic interventions for this devastating disease.

LINKS

Stutzmann laboratory: https://www.rosalindfranklin.edu/academics/faculty/grace-e-stutzmann/

Relevant articles:

https://pmc.ncbi.nlm.nih.gov/articles/PMC7763805/pdf/cells-09-02655.pdf

https://pmc.ncbi.nlm.nih.gov/articles/PMC9894236/pdf/pnas.202211999.pdf

https://pmc.ncbi.nlm.nih.gov/articles/PMC12305934/pdf/40478_2025_Article_2023.pdf

https://pmc.ncbi.nlm.nih.gov/articles/PMC3091392/pdf/nihms288394.pdf

Long believed to function only as the cell’s powerhouse research is revealing that mitochondria actively control a cell’s response to various types of stress. Even more amazingly mitochondria send stress-related signals between cells. In this episode UC Berkeley Professor Andy Dillin has made major advances in understanding basic mechanisms of aging, how cells and animals respond to stress, and how the aging process can be influenced by mitochondrial responses to stress. In this episode I talk with Andy about his work and its implications for optimizing health and longevity.

LINKS

Dillin Laboratory: https://mcb.berkeley.edu/labs/dillin/

Publications

https://pmc.ncbi.nlm.nih.gov/articles/PMC10399134/pdf/load001.pdf

https://pubmed.ncbi.nlm.nih.gov/32449292/

https://www.cell.com/action/showPdf?pii=S1097-2765%2817%2930395-7

https://pmc.ncbi.nlm.nih.gov/articles/PMC10575585/pdf/sciadv.adi1411.pdf

While neurons and the circuits the form have been the major focus of brain research the human brain contains at least as many cells that are not neurons of which astrocytes are by far the most abundant. During the past decade there have been numerous studies that reveal novel and very active roles for astrocytes in regulating the growth of neurons, the formation and modification of synapses, the activities of neural networks, and behaviors in laboratory animals. In this episode Marc Freeman talks about the fascinating world of astrocytes including their diversity, complex morphologies, and roles in neuroplasticity and disease processes.

LINKS:

Marc Freeman’s webpage at the Vollum Institute:

https://www.ohsu.edu/vollum-institute/marc-freeman-phd

Articles discussed in this podcast:

https://pmc.ncbi.nlm.nih.gov/articles/PMC11513168/pdf/nihms-2030570.pdf

https://pmc.ncbi.nlm.nih.gov/articles/PMC7897322/pdf/nihms-1657553.pdf

https://pmc.ncbi.nlm.nih.gov/articles/PMC5161596/pdf/nihms-822004.pdf

https://pubmed.ncbi.nlm.nih.gov/39386551/

Because neurons in the brain are electrically excitable and active 24/7 the brain consumes relatively large amounts of energy and must adapt to varying demands on its neural networks. The cellular and molecular complexity of the brain presents a major challenge for understanding not only its second-by-second function but also how neural networks are affected by aging and disease. In this episode Dr. Polina Schichkova talks about how large datasets on cellular energy metabolism gene expression are being used to elucidate how aging affects the brain as a whole. Her findings from analyses of data from brains of young adults and elder humans show that aging results in reduced flexibility of the brain’s bioenergetics and electrical activity. Computer modeling reveals how the brain is altered during aging as well as potential interventions to counteract age-related processes.

LINKS

Breakdown and repair of metabolism in the aging brain:

file:///Users/markmattson/Downloads/fsci-3-1441297%20(2).pdf

Multiscale electro-metabolic model of the brain:

https://pmc.ncbi.nlm.nih.gov/articles/PMC12112163/pdf/pcbi.1013070.pdf

Online modeling:

https://www.openbraininstitute.org/jupyterhub_metabolism/user/mpaulmattson@gmail.com/lab/tree/obi_platform_analysis_notebooks/Metabolism/analysis_notebook.ipynb