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Brainstem01:19

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The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
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Neuronal Nuclei Isolation from Human Postmortem Brain Tissue
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Selective Vulnerability of Brainstem Nuclei in Distinct Tauopathies: A Postmortem Study.

Rana A Eser1, Alexander J Ehrenberg1, Cathrine Petersen1

  • 1Department of Neurology, Memory and Aging Center, University of California, San Francisco, San Francisco, California.

Journal of Neuropathology and Experimental Neurology
|January 6, 2018
PubMed
Summary

Brainstem reticular formation (RF) degeneration differs across Alzheimer disease (AD), corticobasal degeneration (CBD), and progressive supranuclear palsy (PSP). This study reveals distinct RF nuclei vulnerability patterns in these tauopathies, impacting clinical phenotypes.

Keywords:
Alzheimer diseaseCorticobasal degenerationHuman brainstemProgressive supranuclear palsyReticular formationSelective vulnerabilityTauopathies

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Area of Science:

  • Neuroscience
  • Neuropathology
  • Neurodegenerative Diseases

Background:

  • The brainstem reticular formation (RF) is crucial for homeostasis, behavior, and cognition.
  • RF degeneration is observed in tauopathies like Alzheimer disease (AD), progressive supranuclear palsy (PSP), and corticobasal degeneration (CBD).
  • Distinct clinical phenotypes associated with RF degeneration suggest differential vulnerability patterns among these diseases despite similar tau pathology burdens.

Purpose of the Study:

  • To compare the selective vulnerability patterns of specific RF nuclei in AD, CBD, and PSP.
  • To investigate how tauopathies differentially affect RF nuclei.
  • To establish a foundation for understanding the clinical consequences of RF degeneration in tauopathies.

Main Methods:

  • Analysis of 5 RF nuclei in post-mortem brain tissue from 14 AD, 14 CBD, 10 PSP, and 3 control cases.
  • Multidimensional quantitative analysis of tau inclusion burden and neuronal loss.
  • Comparative assessment of tau pathology and neuronal populations across different tauopathy subtypes.

Main Results:

  • Discernible differences in RF nuclei vulnerability to AD, CBD, and PSP were identified.
  • Locus coeruleus showed higher tau burden in PSP and CBD compared to AD, but extreme neuronal loss in AD limited aggregate formation.
  • Gigantocellular nucleus had low tau burden in AD and high in PSP, with fewer GABAergic neurons in AD, challenging its role in REM behavioral disorders in AD.

Conclusions:

  • RF nuclei exhibit distinct vulnerability patterns in different tauopathies.
  • Neuronal loss, not just tau burden, influences the presentation of RF degeneration.
  • Findings provide a basis for characterizing clinical consequences and guiding tailored treatments for tauopathies affecting the RF.