Further evidence World Trade Center responders are at risk for dementia


Date:
July 28, 2020
Source:
Stony Brook University
Summary:
New studies indicate that World Trade Center (WTC) first responders
are at risk for developing dementia.



FULL STORY ==========================================================================
Two studies led by Stony Brook University researchers to be presented
virtually at the Alzheimer's Association International Conference on July
28, 2020, indicate that World Trade Center (WTC) first responders are at
risk for developing dementia. The studies included individuals with signs
of cognitive impairment (CI) who show neuroradiological abnormalities
and changes in their blood similar to that seen in Alzheimer's disease
patients and those with related dementias.


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One study in Alzheimer's and Dementia: Diagnosis, Assessment and Disease Monitoring (DADM) shows that many responders with CI have reduced gray
matter thickness in the brain consistent with neurodegenerative conditions
and evidence their brain "age" is about 10 years older on average than
the normal population. This research is in collaboration with scientists
at the Icahn School of Medicine at Mount Sinai.

The other study, to be published in Translational Psychiatry, reveals
some responders with post-traumatic stress disorder (PTSD) and mild CI
possess protein changes in their blood consistent with Alzheimer's.

"The environmental exposures and psychological pressures experienced
by responders during 911 and its aftermath has had an insidious effect
on their health and well-being," says Benjamin Luft, MD, Director of
the Stony Brook WTC Health and Wellness Program. "Now nearly 20 years
post-911, clinicians who care for these individuals are seeing more
patients who are showing signs of cognitive disorders and possible
dementia. Findings from our new studies provide data for the first
time that support the idea that this population of patients who have
cognitive impairment not only have psychological problems such as PTSD
but may be at high-risk for neurodegenerative disorders, a possibility
that needs immediate and continued investigation." One study is the
first to use MRI imaging to assess the brain matter of WTC responder
patients with and without symptoms of CI. The goal of this study is to determine if WTC responders in their midlife have developed CI due to
changes in their brain possibly caused by neurotoxins they were exposed
to at Ground Zero. The age range of patients was 45 to 65 years, an age
range where cortical atrophy is rare in the normal population.

Researchers measured the brain cortex, the area responsible for cognition.

Cortical thickness is a consistent measure of brain atrophy commonly used
in studies of patients with Alzheimer's and related dementias. Imaging
revealed areas of the cortex are atrophied in many WTC patients with
cognitive impairment, compared to control subjects.



========================================================================== "While there are many reasons for cognitive decline because of brain
changes, the loss of gray matter in the brain is one of the most
concerning and can be measured by cortical thickness," explains Sean
Clouston, PhD, lead author and Associate Professor of Family, Population
and Preventive Medicine and in the Program in Public Health. "We found
a direct correlation between those suffering from cognitive impairment
and cortical thickness, indicating a reduction in gray matter of the
brain at levels consistent with neurodegenerative disease." The overall
amount of cortical atrophy in responders with CI was significantly more
than responders who did not have CI symptoms, as well as to the general population based on normative data.

According to the authors, the MRI imaging revealed that cortical thickness
was significantly reduced in 23 out of 34 cortical regions among those
with CI.

These included the frontal, temporal and occipital lobes. When compared
to published data, both responders with CI and those without CI showed significant reductions in cortical thickness in seven regions in or near
the temporal lobe potentially indicative of a population-level effect.

Dr. Clouston said that the level of reduction in the cortical thickness
in many responders is similar to that in patients with dementia and is
"a possible indicator of early stage dementia with possible early onset dementia likely to occur for a portion of these individuals at midlife." However, he explains that these patients need to be studied longitudinally
to determine whether these changes progress over time. Additional imaging
and other related brain research is also necessary to determine the
cause or causes of brain atrophy in WTC responders.



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The second study describes an analysis of 276 proteins in the blood in
181 WTC male responders in midlife -- their average age 55 years.

Each of the identified proteins are instrumental to a range of processes indicative of neurological diseases, cellular regulation, immunology, cardiovascular, inflammatory, developmental and metabolism functions.

Given that PTSD and mild CI are common to 911 responders -- which affect
their cognitive and memory processes -- individuals with these conditions
were studied.

By using a sophisticated process that identifies dysregulation of proteins among the 276 identified for the study, the researchers found that WTC responders with mild CI also had proteinopathy, or problematic changes
in the proteome, consistent with Alzheimer's and related diseases as
well as other neuropsychiatric conditions.

"We believe that neuro-inflammation is a possible mechanism in which
responders with PTSD appear to be at a higher risk of developing mild
cognitive impairment," said Dr. Luft, senior author. "We hope our unique analysis of proteins associated with cognitive impairment-related
diseases in this population is an additional way to identify their
risk based on changes in their body likely due from their exposures."
The studies were supported by the National Institute for Safety and Occupational Health (NIOSH) and the National Institute on Aging (NIH
grant number R01AG049953).


========================================================================== Story Source: Materials provided by Stony_Brook_University. Note:
Content may be edited for style and length.


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Link to news story: https://www.sciencedaily.com/releases/2020/07/200728113554.htm

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