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Updated: Aug 18, 2026
Three-dimensional Confocal Analysis of Microglia/macrophage Markers of Polarization in Experimental Brain Injury
Published on: September 4, 2013
Microwave-stimulated recovery of myosin-V immunoreactivity from formalin-fixed, paraffin-embedded human CNS
A R Martins1, M M Dias, T M Vasconcelos
1Department of Pharmacology, Faculty of Medicine of Ribeirão Prêto, University of São Paulo, Brazil. armartin@fmrp.usp.br
Abstract:
The lability of brain myosin-V (BM-V) to aldehyde-fixation has hindered immunohistochemical (IH) studies of this actin-based motor. We show here that BM-V immunoreactivity (IR) can be retrieved from formalin-fixed, paraffin-embedded human tissue. BM-V IR was optimally retrieved by boiling 5 microm cerebellar tissue sections in 10 mM sodium citrate buffer, pH 6, for 15 min, using a microwave oven set at 900 W and 2.45 GHz. A polyclonal, affinity purified anti-BM-V antibody, raised in rabbits against the tail domain of chicken BM-V, was shown here to recognize a single band in Western blots of human cortical homogenates. The combined use of this monospecific antibody and of the antigen retrieval (AR) method above allowed us to verify that BM-V IR is strongly expressed in human Purkinje cell bodies and dendrites, and in granule cells. The same pattern of BM-V IR expression was consistently and maximally detected in tissues stored in 10% formalin from 1 week to 2.5 months. The AR protocol for BM-V described here permits its IH study in formaldehyde-fixed tissues. It is a valuable tool to study BM-V in well fixed tissues, as occurs with the large collection of human archival tissue available.
Insights
Immunohistochemical studies of brain myosin-V (BM-V) are now possible in archival human tissues. A novel antigen retrieval method effectively restores BM-V immunoreactivity in formalin-fixed samples.
Area of Science:
- Neuroscience
- Cell Biology
- Immunohistochemistry
Background:
- Brain myosin-V (BM-V) is an actin-based motor protein crucial for neuronal function.
- Aldehyde-fixation, commonly used in tissue preparation, causes lability of BM-V, hindering immunohistochemical studies.
- Limited availability of suitable methods restricts the investigation of BM-V in fixed human brain tissues.
Purpose of the Study:
- To develop and optimize an antigen retrieval (AR) method for detecting BM-V immunoreactivity (IR) in formalin-fixed, paraffin-embedded human tissues.
- To validate the specificity of an anti-BM-V antibody for use in immunohistochemistry.
- To investigate the expression pattern of BM-V in human brain tissues using the optimized AR protocol.
Main Methods:
- Optimization of an antigen retrieval protocol involving microwave-assisted heating of tissue sections in sodium citrate buffer (pH 6).
- Western blot analysis using a polyclonal anti-BM-V antibody to confirm its specificity against human cortical homogenates.
- Application of the optimized AR method and antibody to analyze BM-V IR in human cerebellar tissue sections.
Main Results:
- Optimal BM-V IR retrieval was achieved by boiling tissue sections in sodium citrate buffer (pH 6) for 15 minutes using a microwave.
- The anti-BM-V antibody recognized a single specific band in Western blots, confirming its monospecificity.
- Strong BM-V IR was observed in human Purkinje cell bodies and dendrites, as well as in granule cells, with consistent detection in tissues stored for up to 2.5 months.
Conclusions:
- The developed AR protocol enables reliable immunohistochemical detection of BM-V in formaldehyde-fixed human tissues.
- This method is valuable for studying BM-V expression in archival human tissue collections.
- The findings provide insights into the distribution of BM-V within the human cerebellum.
