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Update on Hippocampal Sclerosis
Juliana R Dutra1, Etty P Cortés, Jean Paul G Vonsattel
1Division of Aging and Dementia, Department of Neurology, Columbia University Medical Center, 622 West 168th Street, PH-19, Room 121, New York, NY, 10032, USA, jd3109@cumc.columbia.edu.
Insights
Hippocampal sclerosis (HS) involves severe hippocampal damage, often seen with Alzheimer's disease (AD). Understanding its links to TDP-43 and genetics aids diagnosis and pathogenesis research.
Area of Science:
- Neuropathology
- Neurodegenerative Diseases
Background:
- Hippocampal sclerosis (HS) is characterized by significant hippocampal volume and neuronal loss, primarily in CA1 and subiculum fields, accompanied by reactive gliosis.
- HS can present as 'pure HS' in older adults with dementia or as 'combined HS' alongside other neurodegenerative conditions, most commonly Alzheimer's disease (AD).
Purpose of the Study:
- To elucidate the neuropathological hallmarks of hippocampal sclerosis.
- To discuss the diagnostic challenges of HS, particularly differentiating it from AD in living patients.
- To highlight recent advances in understanding HS pathogenesis, including its association with TDP-43 and genetic factors.
Main Methods:
- Review of neuropathological findings in hippocampal sclerosis.
- Comparison of clinical and pathological features of pure HS, combined HS, and Alzheimer's disease.
- Analysis of the role of transactive response DNA-binding protein 43 (TDP-43) and genetic risk factors in HS pathogenesis.
Main Results:
- Diagnostic hallmarks include severe hippocampal volume loss, neuronal loss, and gliosis in CA1 and subiculum.
- HS is frequently combined with Alzheimer's disease, complicating in-life diagnosis, often leading to postmortem confirmation.
- A strong association (approx. 90%) with TDP-43 and identified genetic risk factors are key to understanding HS pathogenesis.
Conclusions:
- Hippocampal sclerosis presents distinct neuropathological features but poses diagnostic challenges due to overlap with AD.
- The high prevalence of TDP-43 pathology and emerging genetic insights are crucial for advancing the understanding of HS.
- Further research into HS pathogenesis is warranted, integrating molecular and genetic findings for improved diagnostic and therapeutic strategies.
Abstract:
The diagnostic hallmarks of hippocampal sclerosis (HS) are severe volume loss of the hippocampus, severe neuronal loss, and reactive gliosis involving primarily two especially vulnerable fields, CA1 and the subiculum. Occasionally, HS may be the only neuropathological change detected in older individuals with dementia and is known as pure HS. In the majority of cases, HS occurs in the setting of other degenerative changes, usually Alzheimer's disease (AD). In these cases, it is classified as combined HS. Although a clinical profile for HS has been identified, its similarities with AD make the diagnosis during life quite challenging; thus, the diagnosis is often made postmortem. The pathogenesis of HS is not completely understood, but the strong association with transactive response DNA-binding protein 43 (TDP-43), in approximately 90%, and the recent discovery of genetic risk factors are important contributions to a better understanding of the disease process.
