CD34

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CD34
Identifiers
Gene ontology
Molecular function
Cellular component
Biological process
Sources:Amigo / QuickGO
Ensembl
UniProt
RefSeq (mRNA)

NM_001025109
NM_001773

NM_001111059
NM_133654

RefSeq (protein)

NP_001020280
NP_001764

NP_001104529
NP_598415

Location (UCSC)Chr 1: 207.88 – 207.91 MbChr 1: 194.62 – 194.64 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

CD34 is a transmembrane phosphoglycoprotein protein encoded by the CD34 gene in humans, mice, rats and other species.[5][6][7]

CD34 derives its name from the

stem cells to bone marrow extracellular matrix or directly to stromal cells. Clinically, it is associated with the selection and enrichment of hematopoietic stem cells for bone marrow transplants. Due to these historical and clinical associations, CD34 expression is almost ubiquitously related to hematopoietic cells; however, it is actually found on many other cell types as well.[12]

Function

The CD34 protein is a member of a family of single-pass transmembrane

haematopoietic and vascular-associated progenitor cells.[13] However, little is known about its exact function.[14]

CD34 is also an important adhesion molecule and is required for T cells to enter lymph nodes. It is expressed on lymph node endothelia, whereas the L-selectin to which it binds is on the T cell.[15][16] Conversely, under other circumstances CD34 has been shown to act as molecular "Teflon" and block mast cell, eosinophil and dendritic cell precursor adhesion, and to facilitate opening of vascular lumina.[17][18] Finally, recent data suggest CD34 may also play a more selective role in chemokine-dependent migration of eosinophils and dendritic cell precursors.[19][20] Regardless of its mode of action, under all circumstances CD34, and its relatives podocalyxin and endoglycan, facilitates cell migration.[13][19]

Tissue distribution

Cells expressing CD34 (CD34+ cell) are normally found in the

SFT, HPC, and to some degree in MPNSTs, etc. The presence of CD34 on non-hematopoietic cells in various tissues has been linked to progenitor and adult stem cell phenotypes.[12]

It is important to mention that Long-Term Haematopoietic Stem Cells (LT-HSCs) in mice and humans are the haematopoietic cells with the greatest self-renewal capacity and were shown to be CD34+ and CD38 cell fraction within the lineage-depleted cell population (LIn).[21][22] Human HSCs express the CD34 marker.[21][23] Later studies have reported that low rhodamine retention identifies LT-HSCs within the LinCD34+CD38 population.[24][25][26]

CD34 is expressed in roughly 20% of murine haematopoietic stem cells,[27] and can be stimulated and reversed.[28]

Clinical applications

CD34+ is often used clinically to quantify the number of haemopoietic stem cells for use in haemopoietic stem cell transplantation. This is generally a useful marker for cell dosing although there is some evidence that the CD34+ quantification may not be reliable in some circumstances.[29] CD34+ cells may be isolated from blood samples using immunomagnetic techniques and used for CD34+ transplants, which have lower rates of graft-versus-host disease.[30]

Antibodies are used to quantify and purify

megakaryocytes
.

Cells observed as CD34+ and CD38- are of an

multipotent hematopoietic stem cells
. Thus, because of their CD34+ expression, such undifferentiated cells can be sorted out.

In tumors, CD34 is found in

papillary thyroid carcinoma
.

A negative CD34 may exclude

inflammatory myofibroblastic tumors
of the stomach.

Injection of CD34+

hematopoietic stem cells has been clinically applied to treat various diseases including spinal cord injury,[31] liver cirrhosis[32] and peripheral vascular disease.[33]

Interactions

CD34 has been shown to

interacts with L-selectin, important in inflammation
. CD34- has been related to hair follicles' melanocyte regeneration and CD34+ with neuronal regeneration.

See also

References

  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000174059Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000016494Ensembl, 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: CD34 CD34 molecule".
  6. PMID 1370171
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  10. ^ Tindle RW. Katz F. Martin H. Watt D. Catovsky D. Janossy G. Greaves M. (1987). "BI-3C5 (CD34) defines multipotential and lineage restricted progenitor cells and their leukaemic counterparts ". In 'Leucocyte Typing 111: White Cell Differentiation Antigens. Oxford University Press, 654-655.
  11. ^ Loken M. Shah V. Civin CI.. (1987). "Characterization of myeloid antigens on human bone marrow using multicolour immunofluorescence". In: McMichael, Leucocyte Typing III:White Cell Differentiation Antigens.Oxford University Press 630-635.
  12. ^
    PMID 24497003
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  31. ^ Srivastava A, Bapat M, Ranade S, Srinivasan V, Murugan P, Manjunath S, Thamaraikannan P, Abraham S (2010). "Autologous Multiple Injections of in Vitro Expanded Autologous Bone Marrow Stem Cells For Cervical Level Spinal Cord Injury - A Case Report". Journal of Stem Cells and Regenerative Medicine.
  32. S2CID 5649484
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Further reading

External links

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