A subset of prolyl oligopeptidases, including dipeptidyl-peptidase IV (DPP IV or CD26, EC ), specifically cleave off N-terminal dipeptides from substrates having proline or alanine in amino acid position 2. This enzyme activity has been implicated in the regulation of the biological activity of multiple hormones and chemokines, including the insulinotropic peptides glucagon-like peptide 1 (GLP-...

Dipeptidyl peptidase IV (DPPIV/CD26; EC. 3.4.14.5), a widely distributed multifunctional type II plasma membrane glycoprotein, is involved in different biological processes. It is a serine protease associated with uptake and transmembrane transport of proline-containing peptides as well as with processing of physiological active peptides1. As an exopeptidase it cleaves N -terminal dipeptides af...

RESUMEN CD26 es una ectopeptidasa de 110 kDa anclada en la superficie celular con una actividad dipeptidil peptidasa IV (DPPIV) intrínseca, la cual une a la adenosina desaminasa (ADA) sobre la superficie de células T. ADA es un enzima del metabolismo de las purinas la cual ha sido el objeto de interés considerable, principalmente porque la deficiencia congénita de ésta causa inmunodeficiencia s...

C D26, the T cell activation molecule, is a 110-kD gly-coprotein that is also present on epithelial cells of various tissues, including the liver, kidney, and intestine. CD26 possesses a known dipeptidyl peptidase (DPP)IV activity in its extracellular domain (1). A paper by Wesley et al. in this issue indicates a possible role for CD26/DPPIV in suppressing malignant transformation of melanocyte...

C D26, the T cell activation molecule, is a 110-kD gly-coprotein that is also present on epithelial cells of various tissues, including the liver, kidney, and intestine. CD26 possesses a known dipeptidyl peptidase (DPP)IV activity in its extracellular domain (1). A paper by Wesley et al. in this issue indicates a possible role for CD26/DPPIV in suppressing malignant transformation of melanocyte...

CD26/dipeptidylpeptidase IV (DPPIV) is a membrane-bound extracellular peptidase that cleaves dipeptides from the N terminus of polypeptide chains. The N terminus of chemokines is known to interact with the extracellular portion of chemokine receptors, and removal of these amino acids in many instances results in significant changes in functional activity. CD26/DPPIV has the ability to cleave th...

OBJECTIVE(S) Non-alcoholic steatohepatitis (NASH) is a chronic liver disease with unknown etiology. The insulin resistance, immune mechanisms and oxidative stress are the main factors in its pathogenesis. Dipeptidyl peptidase IV (DPPIV) or CD26 is a protein with endocrine and immune functions. This study aimed to elicudate the changes related to DPPIV in NASH patients. METHODS Serum and urina...

Proteolysis is a regulatory step in many physiological processes, but which proteases in what cellular sites are involved in activation or degradation of which peptides is not well known. We developed a rapid assay consisting of living cells and fluorogenic protease substrates to determine which bioactive peptides are possible natural substrates of a specific protease with the multifunctional o...

Adenosine deaminase (ADA) is responsible for the deamination of immunosuppressive adenosine to inosine. In human T lymphocytes, ADA is associated with dipeptidyl peptidase IV (CD26). ADA expression and activity were evaluated in regulatory T cells (Treg) and CD4(+) T effector cells (Teff) of patients with head and neck squamous cell cancer (HNSCC). CD4(+)CD39(+) and CD4(+)CD39(neg) T cells were...

Chemokines are proinflammatory cytokines that play a role in leukocyte migration and activation. Recent reports showed that RANTES (regulated on activation normal T-cell expressed and secreted chemokine), eotaxin, macrophagederived chemokine (MDC), and stromal cell–derived factor-1 (SDF-1) are NH2terminally truncated by the lymphocyte surface glycoprotein and protease CD26/ dipeptidyl peptidase...