is a protein
that in humans is encoded by the VIM gene
Vimentin is a type III intermediate filament
(IF) protein that is expressed in mesenchymal
cells. IF proteins are found in all metazoan cells
as well as bacteria
. IF, along with tubulin
-based microfilaments, comprises the cytoskeleton
. All IF proteins are expressed in a highly developmentally-regulated fashion; vimentin is the major cytoskeletal component of mesenchymal
cells. Because of this, vimentin is often used as a marker of mesenchymally-derived cells or cells undergoing an epithelial-to-mesenchymal transition
(EMT) during both normal development and metastatic
A vimentin monomer, like all other intermediate filaments, has a central α-helical domain
, capped on each end by non- helical
amino (head) and carboxyl (tail) domains. Two monomers are likely co-translationally expressed in a way that facilitates their formation of a coiled-coil dimer, which is the basic subunit of vimentin assembly.
The α-helical sequences contain a pattern of hydrophobic amino acids that contribute to forming a "hydrophobic seal" on the surface of the helix. In addition, there is a periodic distribution of acidic and basic amino acids
that seems to play an important role in stabilizing coiled-coil
dimers. The spacing of the charged residues is optimal for ionic salt bridges
, which allows for the stabilization of the α-helix structure. While this type of stabilization is intuitive for intrachain interactions, rather than interchain interactions, scientists have proposed that perhaps the switch from intrachain salt bridges formed by acidic and basic residues to the interchain ionic associations contributes to the assembly of the filament.
Vimentin plays a significant role in supporting and anchoring the position of the organelles in the cytosol
. Vimentin is attached to the nucleus
, endoplasmic reticulum
, and mitochondria
, either laterally or terminally.
The dynamic nature of vimentin is important when offering flexibility to the cell. Scientists found that vimentin provided cells with a resilience absent from the microtubule or actin filament networks, when under mechanical stress in vivo
. Therefore, in general, it is accepted that vimentin is the cytoskeletal component responsible for maintaining cell integrity. (It was found that cells without vimentin are extremely delicate when disturbed with a micropuncture). Transgenic
mice that lack vimentin appeared normal and did not show functional differences. It is possible that the microtubule network may have compensated for the absence of the intermediate network. This result supports an intimate interactions between microtubules and vimentin. Moreover, when microtubule depolymerizers were present, vimentin reorganization occurred, once again implying a relationship between the two systems. On the other hand, wounded mice that lack the vimentin gene heal slower than their wild type counterparts.
In essence, vimentin is responsible for maintaining cell shape, integrity of the cytoplasm, and stabilizing cytoskeletal interactions. Vimentin has been shown to eliminate toxic proteins in JUNQ and IPOD inclusion bodies
in asymmetric division of mammalian cell lines
Also, vimentin is found to control the transport of low-density lipoprotein
, LDL, -derived cholesterol
from a lysosome
to the site of esterification. With the blocking of transport of LDL-derived cholesterol inside the cell, cells were found to store a much lower percentage of the lipoprotein
than normal cells with vimentin. This dependence seems to be the first process of a biochemical function in any cell that depends on a cellular intermediate filament network. This type of dependence has ramifications on the adrenal cells, which rely on cholesteryl esters derived from LDL.
Vimentin plays a role in aggresome
formation, where it forms a cage surrounding a core of aggregated protein.
It has been used as a sarcoma tumor marker
to identify mesenchyme
Methylation of the vimentin gene has been established as a biomarker of colon cancer and this is being utilized in the development of fecal tests for colon cancer. Statistically significant levels of vimentin gene methylation have also been observed in certain upper gastrointestinal pathologies such as Barrett's esophagus
, esophageal adenocarcinoma, and intestinal type gastric cancer. High levels of DNA methylation in the promotor region have also been associated with markedly decreased survival in hormone positive breast cancers.
Downregulation of vimentin was identified in cystic variant of papillary thyroid carcinoma
using a proteomic approach.
See also Anti-citrullinated protein antibody
for its use in diagnosis of rheumatoid arthritis
Vimentin has been shown to interact
The 3' UTR of Vimentin mRNA
has been found to bind a 46kDa protein.