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McVey Neufeld KA, Mao YK, West CL, Ahn M, Hameed H, Iwashita E, Stanisz AM, Forsythe P, Barbut D, Zasloff M, Kunze WA. Squalamine reverses age-associated changes of firing patterns of myenteric sensory neurons and vagal fibres. Commun Biol 2024; 7:80. [PMID: 38200107 PMCID: PMC10781697 DOI: 10.1038/s42003-023-05623-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 11/21/2023] [Indexed: 01/12/2024] Open
Abstract
Vagus nerve signaling is a key component of the gut-brain axis and regulates diverse physiological processes that decline with age. Gut to brain vagus firing patterns are regulated by myenteric intrinsic primary afferent neuron (IPAN) to vagus neurotransmission. It remains unclear how IPANs or the afferent vagus age functionally. Here we identified a distinct ageing code in gut to brain neurotransmission defined by consistent differences in firing rates, burst durations, interburst and intraburst firing intervals of IPANs and the vagus, when comparing young and aged neurons. The aminosterol squalamine changed aged neurons firing patterns to a young phenotype. In contrast to young neurons, sertraline failed to increase firing rates in the aged vagus whereas squalamine was effective. These results may have implications for improved treatments involving pharmacological and electrical stimulation of the vagus for age-related mood and other disorders. For example, oral squalamine might be substituted for or added to sertraline for the aged.
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Affiliation(s)
| | - Yu-Kang Mao
- Brain-Body Institute, McMaster University, Hamilton, ON, Canada
| | - Christine L West
- Brain-Body Institute, McMaster University, Hamilton, ON, Canada
- Department of Biology, McMaster University, Hamilton, ON, Canada
| | - Matthew Ahn
- Brain-Body Institute, McMaster University, Hamilton, ON, Canada
| | - Hashim Hameed
- Brain-Body Institute, McMaster University, Hamilton, ON, Canada
| | - Eiko Iwashita
- Brain-Body Institute, McMaster University, Hamilton, ON, Canada
| | | | - Paul Forsythe
- Department of Medicine, 569 Heritage Medical Research Center, University of Alberta, Edmonton, AB, Canada
| | | | - Michael Zasloff
- Enterin, Inc., Philadelphia, PA, USA.
- MedStar-Georgetown Transplant Institute, Georgetown University School of Medicine, Washington, DC, USA.
| | - Wolfgang A Kunze
- Brain-Body Institute, McMaster University, Hamilton, ON, Canada.
- Department of Biology, McMaster University, Hamilton, ON, Canada.
- Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, ON, Canada.
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