New study reveals the effect of extended space flight on astronauts'
brains

Date:
May 5, 2022
Source:
Oregon Health & Science University
Summary:
Long-duration space flight alters fluid-filled spaces along veins
and arteries in the brain, according to new research.



FULL STORY ========================================================================== Long-duration space flight alters fluid-filled spaces along veins and
arteries in the brain, according to new research from Oregon Health &
Science University and scientists across the country.


========================================================================== "These findings have important implications as we continue space
exploration," said senior author Juan Piantino, M.D., assistant professor
of pediatrics (neurology) in the OHSU School of Medicine. "It also
forces you to think about some basic fundamental questions of science
and how life evolved here on Earth." The research involved imaging the
brains of 15 astronauts before and after extended tours of duty on the International Space Station.

Researchers used magnetic resonance imaging to measure perivascular space
-- or the space around blood vessels -- in the brains of astronauts
prior to their launch and again immediately after their return. They
also took MRI measurements again at one, three and six months after they
had returned.

Astronauts' images were compared with those taken of the same perivascular space in the brains of 16 Earth-bound control subjects.

Comparing before and after images, they found an increase in the
perivascular spaces within the brains of first-time astronauts, but
no difference among astronauts who previously served aboard the space
station orbiting earth.

"Experienced astronauts may have reached some kind of homeostasis,"
Piantino said.



==========================================================================
In all cases, scientists found no problems with balance or visual memories
that might suggest neurological deficits among astronauts, despite the differences measured in the perivascular spaces of their brains.

In comparing a large group of deidentified astronauts, the study is
the first to comparatively assess an important aspect of brain health
in space.

Brains in space Human physiology is based on the fact that life
evolved over millions of years while tethered to Earth's gravitational
pull. Unbound by the forces of gravity, the normal flow of cerebrospinal
fluid in the brain is altered in space.

"We all adapted to use gravity in our favor," Piantino said. "Nature
didn't put our brains in our feet -- it put them high up. Once you
remove gravity from the equation, what does that do to human physiology?" Researchers decided to find out by measuring perivascular spaces, where cerebrospinal fluid flows in the brain.



========================================================================== These spaces are integral to a natural system of brain cleansing that
occurs during sleep. Known as the glymphatic system, this brain-wide
network clears metabolic proteins that would otherwise build up in the
brain. Scientists say this system seems to perform optimally during
deep sleep.

The perivascular spaces measured in the brain amount to the underlying "hardware" of the glymphatic system. Enlargement of these spaces occurs
in aging, and also has been associated with the development of dementia.

Researchers used a technique developed in the laboratory of co-author
Lisa C.

Silbert, M.D., M.C.R., professor of neurology in the OHSU School of
Medicine, to measure changes in these perivascular spaces through
MRI scans.

Piantino said the study could be valuable in helping to diagnose and
treat Earth-bound disorders involving cerebrospinal fluid, such as hydrocephalus.

"These findings not only help to understand fundamental changes that
happen during space flight, but also for people on Earth who suffer from diseases that affect circulation of cerebrospinal fluid," Piantino said.

In addition to Piantino and Silbert, co-authors included first authors
Kathleen E. Hupfeld and Sutton B. Richmond of the University of Florida; Heather R.

McGregor and Rachael D. Seidler of the University of Florida; Daniel L.

Schwartz and Madison N. Luther of OHSU; Nichole E. Beltran, Igor
S. Kofman, Yiri E. De Dios and Ajitkumar P. Mulavara of PBR in Houston;
Roy F. Riascos of the University of Texas Health Science Center; Scott
J. Wood and Jacob J.

Bloomberg of NASA; and Jeffrey J. Iliff of the University of Washington
School of Medicine and the VA Puget Sound Health Care System.

The research was supported by the National Aeronautics and Space Administration, grant NNX11AR02G; the National Space Biomedical Research Institute, award NCC 9-58; the National Science Foundation Graduate
Research Fellowship, grants DGE-1315138 and DGE-1842473; the National
Institute of Neurological Disorders and Stroke, grant T32-NS082128; the National Institute on Aging fellowship 1F99AG068440 and grant awards R01AG056712, P30AG008017 and P30AG066518; and the National Heart Lung
and Blood Institute, grant K23HL150217-01.

The co-authors also thank all of the astronauts who volunteered their
time, without whom this project would not have been possible.


========================================================================== Story Source: Materials provided by
Oregon_Health_&_Science_University. Original written by Erik
Robinson. Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. Kathleen E. Hupfeld, Sutton B. Richmond, Heather R. McGregor,
Daniel L.

Schwartz, Madison N. Luther, Nichole E. Beltran, Igor S. Kofman,
Yiri E.

De Dios, Roy F. Riascos, Scott J. Wood, Jacob J. Bloomberg,
Ajitkumar P.

Mulavara, Lisa C. Silbert, Jeffrey J. Iliff, Rachael D. Seidler,
Juan Piantino. Longitudinal MRI-visible perivascular space (PVS)
changes with long-duration spaceflight. Scientific Reports, 2022;
12 (1) DOI: 10.1038/ s41598-022-11593-y ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2022/05/220505085608.htm

--- up 9 weeks, 3 days, 10 hours, 50 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (1:317/3)