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Longitudinal MRI-visible perivascular space (PVS) changes with long-duration spaceflight
Humans are exposed to extreme environmental stressors during spaceflight and return with alterations in brain structure and shifts in intracranial fluids. To date, no studies have evaluated the effects of spaceflight on perivascular spaces (PVSs) within the brain, which are believed to facilitate fl...
Autores principales: | , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9072425/ https://www.ncbi.nlm.nih.gov/pubmed/35513698 http://dx.doi.org/10.1038/s41598-022-11593-y |
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author | Hupfeld, Kathleen E. Richmond, Sutton B. McGregor, Heather R. Schwartz, Daniel L. Luther, Madison N. Beltran, Nichole E. Kofman, Igor S. De Dios, Yiri E. Riascos, Roy F. Wood, Scott J. Bloomberg, Jacob J. Mulavara, Ajitkumar P. Silbert, Lisa C. Iliff, Jeffrey J. Seidler, Rachael D. Piantino, Juan |
author_facet | Hupfeld, Kathleen E. Richmond, Sutton B. McGregor, Heather R. Schwartz, Daniel L. Luther, Madison N. Beltran, Nichole E. Kofman, Igor S. De Dios, Yiri E. Riascos, Roy F. Wood, Scott J. Bloomberg, Jacob J. Mulavara, Ajitkumar P. Silbert, Lisa C. Iliff, Jeffrey J. Seidler, Rachael D. Piantino, Juan |
author_sort | Hupfeld, Kathleen E. |
collection | PubMed |
description | Humans are exposed to extreme environmental stressors during spaceflight and return with alterations in brain structure and shifts in intracranial fluids. To date, no studies have evaluated the effects of spaceflight on perivascular spaces (PVSs) within the brain, which are believed to facilitate fluid drainage and brain homeostasis. Here, we examined how the number and morphology of magnetic resonance imaging (MRI)-visible PVSs are affected by spaceflight, including prior spaceflight experience. Fifteen astronauts underwent six T(1)-weighted 3 T MRI scans, twice prior to launch and four times following their return to Earth after ~ 6-month missions to the International Space Station. White matter MRI-visible PVS number and morphology were calculated using an established, automated segmentation algorithm. We validated our automated segmentation algorithm by comparing algorithm PVS counts with those identified by two trained raters in 50 randomly selected slices from this cohort; the automated algorithm performed similarly to visual ratings (r(48) = 0.77, p < 0.001). In addition, we found high reliability for four of five PVS metrics across the two pre-flight time points and across the four control time points (ICC(3,k) > 0.50). Among the astronaut cohort, we found that novice astronauts showed an increase in total PVS volume from pre- to post-flight, whereas experienced crewmembers did not (p = 0.020), suggesting that experienced astronauts may exhibit holdover effects from prior spaceflight(s). Greater pre-flight PVS load was associated with more prior flight experience (r = 0.60–0.71), though these relationships did not reach statistical significance (p > 0.05). Pre- to post-flight changes in ventricular volume were not significantly associated with changes in PVS characteristics, and the presence of spaceflight associated neuro-ocular syndrome (SANS) was not associated with PVS number or morphology. Together, these findings demonstrate that PVSs can be consistently identified on T(1)-weighted MRI scans, and that spaceflight is associated with PVS changes. Specifically, prior spaceflight experience may be an important factor in determining PVS characteristics. |
format | Online Article Text |
id | pubmed-9072425 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-90724252022-05-07 Longitudinal MRI-visible perivascular space (PVS) changes with long-duration spaceflight Hupfeld, Kathleen E. Richmond, Sutton B. McGregor, Heather R. Schwartz, Daniel L. Luther, Madison N. Beltran, Nichole E. Kofman, Igor S. De Dios, Yiri E. Riascos, Roy F. Wood, Scott J. Bloomberg, Jacob J. Mulavara, Ajitkumar P. Silbert, Lisa C. Iliff, Jeffrey J. Seidler, Rachael D. Piantino, Juan Sci Rep Article Humans are exposed to extreme environmental stressors during spaceflight and return with alterations in brain structure and shifts in intracranial fluids. To date, no studies have evaluated the effects of spaceflight on perivascular spaces (PVSs) within the brain, which are believed to facilitate fluid drainage and brain homeostasis. Here, we examined how the number and morphology of magnetic resonance imaging (MRI)-visible PVSs are affected by spaceflight, including prior spaceflight experience. Fifteen astronauts underwent six T(1)-weighted 3 T MRI scans, twice prior to launch and four times following their return to Earth after ~ 6-month missions to the International Space Station. White matter MRI-visible PVS number and morphology were calculated using an established, automated segmentation algorithm. We validated our automated segmentation algorithm by comparing algorithm PVS counts with those identified by two trained raters in 50 randomly selected slices from this cohort; the automated algorithm performed similarly to visual ratings (r(48) = 0.77, p < 0.001). In addition, we found high reliability for four of five PVS metrics across the two pre-flight time points and across the four control time points (ICC(3,k) > 0.50). Among the astronaut cohort, we found that novice astronauts showed an increase in total PVS volume from pre- to post-flight, whereas experienced crewmembers did not (p = 0.020), suggesting that experienced astronauts may exhibit holdover effects from prior spaceflight(s). Greater pre-flight PVS load was associated with more prior flight experience (r = 0.60–0.71), though these relationships did not reach statistical significance (p > 0.05). Pre- to post-flight changes in ventricular volume were not significantly associated with changes in PVS characteristics, and the presence of spaceflight associated neuro-ocular syndrome (SANS) was not associated with PVS number or morphology. Together, these findings demonstrate that PVSs can be consistently identified on T(1)-weighted MRI scans, and that spaceflight is associated with PVS changes. Specifically, prior spaceflight experience may be an important factor in determining PVS characteristics. Nature Publishing Group UK 2022-05-05 /pmc/articles/PMC9072425/ /pubmed/35513698 http://dx.doi.org/10.1038/s41598-022-11593-y Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Hupfeld, Kathleen E. Richmond, Sutton B. McGregor, Heather R. Schwartz, Daniel L. Luther, Madison N. Beltran, Nichole E. Kofman, Igor S. De Dios, Yiri E. Riascos, Roy F. Wood, Scott J. Bloomberg, Jacob J. Mulavara, Ajitkumar P. Silbert, Lisa C. Iliff, Jeffrey J. Seidler, Rachael D. Piantino, Juan Longitudinal MRI-visible perivascular space (PVS) changes with long-duration spaceflight |
title | Longitudinal MRI-visible perivascular space (PVS) changes with long-duration spaceflight |
title_full | Longitudinal MRI-visible perivascular space (PVS) changes with long-duration spaceflight |
title_fullStr | Longitudinal MRI-visible perivascular space (PVS) changes with long-duration spaceflight |
title_full_unstemmed | Longitudinal MRI-visible perivascular space (PVS) changes with long-duration spaceflight |
title_short | Longitudinal MRI-visible perivascular space (PVS) changes with long-duration spaceflight |
title_sort | longitudinal mri-visible perivascular space (pvs) changes with long-duration spaceflight |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9072425/ https://www.ncbi.nlm.nih.gov/pubmed/35513698 http://dx.doi.org/10.1038/s41598-022-11593-y |
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