CD5 (protein)

CD5[5] is a cluster of differentiation expressed on the surface of T cells (various species) and in a subset of murine B cells known as B-1a. The expression of this receptor in human B cells has been a controversial topic and to date there is no consensus regarding the role of this receptor as a marker of human B cells. B-1 cells have limited diversity of their B-cell receptor due to their lack of the enzyme terminal deoxynucleotidyl transferase (TdT) and are potentially self-reactive. CD5 serves to mitigate activating signals from the BCR so that the B-1 cells can only be activated by very strong stimuli (such as bacterial proteins) and not by normal tissue proteins. CD5 was used as a T-cell marker until monoclonal antibodies against CD3 were developed.

CD5
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesCD5, LEU1, T1, CD5 molecule
External IDsOMIM: 153340 MGI: 88340 HomoloGene: 7260 GeneCards: CD5
Gene location (Human)
Chr.Chromosome 11 (human)[1]
Band11q12.2Start61,102,489 bp[1]
End61,127,852 bp[1]
RNA expression pattern
More reference expression data
Orthologs
SpeciesHumanMouse
Entrez

921

12507

Ensembl

ENSG00000110448

ENSMUSG00000024669

UniProt

P06127

P13379

RefSeq (mRNA)

NM_014207
NM_001346456

NM_007650

RefSeq (protein)

NP_001333385
NP_055022

NP_031676

Location (UCSC)Chr 11: 61.1 – 61.13 MbChr 19: 10.72 – 10.74 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

In humans, the gene is located on the long arm of chromosome 11. There is no confirmed ligand for CD5 but there is evidence that CD72, a C-type lectin, may be a ligand or that CD5 may be homophilic, binding CD5 on the surface of other cells.[6] CD5 includes a scavenger receptor cysteine-rich protein domain.

T cells express higher levels of CD5 than B cells. CD5 is upregulated on T cells upon strong activation. In the thymus, there is a correlation with CD5 expression and strength of the interaction of the T cell towards self-peptides.

Immunohistochemistry

CD5 is a good immunohistochemical marker for T-cells, although not as sensitive as CD3. About 76% of T-cell neoplasms are reported to express CD5, and it is also found in chronic lymphocytic leukemia and mantle cell lymphoma (both being B cell malignancies), that do not express CD3. It is commonly lost in cutaneous T-cell lymphoma, and its absence can be used as an indicator of malignancy in this condition. The absence of CD5 in T cell acute lymphoblastic leukemia, while relatively rare, is associated with a poor prognosis.[7]

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gollark: Oh, and if it's a paper it might not even come with code or it might be really awful code, yes.
gollark: The code/paper you find isn't going to be conveniently usable by just downloading it and copypasting it into your AI's code or something. You'll probably have to actually understand how it works, yet another unfathomable general intelligence task, figure out how it interfaces with the rest of the code or if it can even be used together at all, and possibly rewrite it entirely to fit with what you need.
gollark: "Pluck it out" is also easy to say, but it's actually even harder.

References
  1. GRCh38: Ensembl release 89: ENSG00000110448 - Ensembl, May 2017
  2. GRCm38: Ensembl release 89: ENSMUSG00000024669 - Ensembl, May 2017
  3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. "Entrez Gene: CD5 CD5 molecule".
  6. Brown MH, Lacey E (Nov 15, 2010). "A ligand for CD5 is CD5". Journal of Immunology. 185: 6068–74. doi:10.4049/jimmunol.0903823. PMC 2996635. PMID 20952682.
  7. Leong, Anthony S-Y; Cooper, Kumarason; Leong, F Joel W-M (2003). Manual of Diagnostic Cytology (2 ed.). Greenwich Medical Media, Ltd. pp. 67–68. ISBN 1-84110-100-1.

Further reading


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