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Updated: Aug 12, 2026
Visualization of G3BP Stress Granules Dynamics in Live Primary Cells
Published on: May 21, 2014
Expression of the human groEL stress-protein homologue in the brain and spinal cord
J E Martin1, M Swash, K Mather
1Department of Neuropathology, Royal London Hospital, UK.
Abstract:
A monoclonal antibody (ML30), previously shown to identify a human mitochondrial protein epitope homologous with the groEL heat-shock protein of bacteria (hsp60), was used in an immunohistochemical survey of the central nervous system in patients dying with no evidence of neurological disease and in tissue from patients dying with various neurological disorders. Staining was performed on frozen tissue sections and on formalin fixed, paraffin embedded tissue. Astrocytes in all areas showed a strong pattern of punctate granular staining, which was increased in astrocytes showing reactive changes. Oligodendrocytes stained lightly in a diffuse granular pattern as did most neurons. Ependymal cells showed apical granular positivity. Expression of the hsp60 epitope recognised by ML30 was not seen in ubiquitinated inclusion bodies in motor neuron disease, neurofibrillary tangles in Alzheimer's disease or Lewy bodies in Parkinson's disease. The epitope recognised by ML30 was stable after formalin fixation and in post mortem tissue up to 96 h after death. Expression of the human groEL stress-protein homologue in brain and spinal cord is consistent with a mitochondrial location and may provide a morphological indicator of the functional or metabolic state of cells, especially glial cells.
Insights
A new study reveals that a human mitochondrial protein, homologous to bacterial heat-shock protein 60 (hsp60), is present in the central nervous system. This protein may serve as a marker for cellular metabolic states, particularly in glial cells.
Area of Science:
- Neuroscience
- Cell Biology
- Immunohistochemistry
Background:
- A monoclonal antibody, ML30, identifies a human mitochondrial protein epitope.
- This epitope is homologous to the bacterial groEL heat-shock protein (hsp60).
- The distribution and stability of this epitope in the central nervous system (CNS) are not well understood.
Purpose of the Study:
- To investigate the expression of the hsp60 epitope in the human CNS using immunohistochemistry.
- To determine if this epitope is present in various neurological disorders.
- To assess the stability of the epitope in fixed and post-mortem tissues.
Main Methods:
- Immunohistochemical staining of frozen and formalin-fixed, paraffin-embedded CNS tissue.
- Analysis of tissue from patients with and without neurological diseases.
- Evaluation of staining patterns in astrocytes, oligodendrocytes, neurons, and ependymal cells.
Main Results:
- Strong punctate granular staining was observed in astrocytes, increasing with reactive changes.
- Oligodendrocytes and most neurons showed light, diffuse granular staining.
- Ependymal cells exhibited apical granular positivity.
- The hsp60 epitope was not found in inclusion bodies of motor neuron disease, Alzheimer's, or Parkinson's disease.
- The epitope remained stable in formalin-fixed tissue and up to 96 hours post-mortem.
Conclusions:
- The hsp60 epitope is expressed in the human CNS, primarily in glial cells, with a mitochondrial localization.
- Its expression pattern suggests it may indicate cellular functional or metabolic status.
- The epitope's stability makes it a potentially useful marker in neuropathological studies.
