Robust immunohistochemical staining of several classes of proteins in tissues subjected to autolysis.
Despite the common use of immunohistochemistry in autopsy tissues, the stability of most proteins over extended time periods is unknown. The robustness of signal for 16 proteins (MMP1, MMP2, MMP3, MMP9, TIMP1, TIMP2, TIMP3, AGER, MSR, SCARB1, OLR1, CD36, LTF, LGALS3, LYZ, and DDOST) and two measures of advanced glycation end products (AGE, CML) was evaluated. Two formalin-fixed, paraffin-embedded human tissue arrays containing 16 tissues each were created to evaluate 48 hr of autolysis in a warm or cold environment. For these classes of proteins, matrix metalloproteinases and their inhibitors, scavenger receptors, and advanced glycation end product receptors, we saw no systematic diminution of signal intensity during a period of 24 hr. Analysis was performed by two independent observers and confirmed for a subset of proteins by digital analysis and Western blotting. We conclude that these classes of proteins degrade slowly and faithfully maintain their immunohistochemistry characteristics over at least a 24-hr time interval in devitalized tissues. This study supports the use of autopsy tissues with short postmortem intervals for immunohistochemical studies for diseases such as diabetic vascular disease, cancer, Alzheimer's disease, atherosclerosis, and other pathological states. This manuscript contains online supplemental material at http://www.jhc.org. Please visit this article online to view these materials.
Maleszewski
Joseph
J
Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, MD 21205, USA.
Lu
Jie
J
Fox-Talbot
Karen
K
Halushka
Marc K
MK
D001158:Arteries / Q000378:metabolism; D001329:Autolysis / Q000378:metabolism*; D018955:CD36 Antigens / Q000378:metabolism; D003331:Coronary Vessels / Q000378:metabolism; D005260:Female; D017127:Glycation End Products, Advanced / Q000378:metabolism*; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods*; D007668:Kidney / Q000378:metabolism; D020782:Matrix Metalloproteinases / Q000378:metabolism; D010920:Placenta / Q000378:metabolism; D011506:Proteins / Q000378:metabolism*; D051122:Scavenger Receptors, Class B / Q000378:metabolism; D013194:Staining and Labeling / Q000379:methods; D013997:Time Factors; D019714:Tissue Inhibitor of Metalloproteinases / Q000378:metabolism
D018955:CD36 Antigens; D017127:Glycation End Products, Advanced; D011506:Proteins; C495124:SCARB1 protein, human; D051122:Scavenger Receptors, Class B; D019714:Tissue Inhibitor of Metalloproteinases; D020782:Matrix Metalloproteinases