What is S100 in immunohistochemistry?
S100 is a family of cytoplasmic calcium-binding proteins expressed in numerous cell lines which can be targeted by immunohistochemistry.
Does S100 stain macrophages?
S100 is not an absolutely exclusive but reliable DC marker in CRC specimen [13, 15]. Furthermore, we were able to distinguish S100-positive dendritic cells from CD163-positive macrophages by double staining for S100/CD163; this is important, since macrophages can also show weak expression of S100.
Is schwannoma S100 positive?
E. S100 shows strong and almost diffuse positivity with schwannoma in contrast to neurofibroma, which variably expresses the antigen due to the presence of other cell populations.
What does negative for S100 mean?
S100 negative melanomas are rare. S100P is positive in all subtypes of melanoma, including desmoplastic melanoma, for the diagnosis of which it remains an important reagent. Along with Sox10 and nerve growth factor receptor (NGFR), it is the most sensitive marker to visualize invasive melanoma (Fig. 29.2).
What cells are S100 positive?
S100 proteins are normally present in cells derived from the neural crest (Schwann cells, and melanocytes), chondrocytes, adipocytes, myoepithelial cells, macrophages, Langerhans cells, dendritic cells, and keratinocytes. They may be present in some breast epithelial cells.
What stains positive for S-100?
Sex cord–stromal tumors, including granulosa cell tumors,421 Sertoli cell tumors,422 and tumors in the fibroma-thecoma group, occasionally show positive staining for S-100.
Does S-100 stain macrophages?
Does avidin-biotin complex stain for S100 protein in canine skin tumors?
Use of the avidin-biotin complex procedure demonstrated variable amounts of S100 protein in the tumor cell cytoplasm and nuclei in 26 of 31 tumors. S100 protein was not observed in some other common canine skin tumors stained by the avidin-biotin complex technique.
Can immunohistochemical staining patterns be used to diagnose meningioma in dogs?
This study examined immunohistochemical staining patterns for several meningioma variants involving either the brain or spinal cord of dogs. Formalin-fixed, paraffin-embedded tissue from 15 tumors was obtained. The selected tumor group included seven meningothelial, three transitional, two malignant …
Which immunohistochemical findings are characteristic of canine gastrointestinal stromal tumors (GIST)?
The immunohistochemical results indicate that the majority of canine gastrointestinal stromal tumors (GIST) with light microscopic features of smooth muscle cells have immunohistochemical staining patterns supporting smooth muscle differentiation. Vimentin reactivity correlated with a light microscopic diagnosis of malignancy.
Where is S100 found in the human body?
Among normal tissues the presence of S100 protein was demonstrated in chondrocytes in the trachea, myoepithelial cells in the breast, melanocytes in the skin, some sweat glands and ducts in the skin, stellate cells in the pituitary, and interdigitating reticulum cells in the lymph node and in Peyer’s patches.
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