Histological analysis of GFP expression in murine bone

XI Jiang, Z Kalajzic, P Maye, A Braut… - … of Histochemistry & …, 2005 - journals.sagepub.com
XI Jiang, Z Kalajzic, P Maye, A Braut, J Bellizzi, M Mina, DW Rowe
Journal of Histochemistry & Cytochemistry, 2005journals.sagepub.com
The power for appreciating complex cellular interactions during embryonic development
using green fluorescent protein (GFP) as a visual histological marker has not been applied
to adult tissues due to loss of GFP signal during paraffin embedding and a high
autofluorescent background, particularly in section of bone and bone marrow. Here we
demonstrate that the GFP signal is well preserved in frozen sections of adult decalcified
bone. Using a tape-transfer system that preserves histological relationships, GFP expression …
The power for appreciating complex cellular interactions during embryonic development using green fluorescent protein (GFP) as a visual histological marker has not been applied to adult tissues due to loss of GFP signal during paraffin embedding and a high autofluorescent background, particularly in section of bone and bone marrow. Here we demonstrate that the GFP signal is well preserved in frozen sections of adult decalcified bone. Using a tape-transfer system that preserves histological relationships, GFP expression can be related to standard histological stains used in bone biology research. The choice of a dual-filter cube and a strong GFP signal makes it possible to readily distinguish at least four different GFP colors that are distinctly different from the autofluorescent background. An additional advantage of the frozen sections is better preservation of immunological epitopes that allow colocalization of an immunostained section with an endogenous GFP and a strong lacZ signal emanating from a β-gal marker gene. We present an approach for recording multiple images from the same histological section that allows colocalization of a GFP signal with subsequent stains and procedures that destroy GFP. Examples that illustrate the flexibility for dual imaging of various fluorescent signals are described in this study. The same imaging approach can serve as a vehicle for archiving, retrieving, and sharing histological images among research groups.
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