Abstract
CD26 is a multifunctional molecule implied to have a variety of roles in the immune response including its activity as a membrane exopeptidase (Dipeptidyl peptidase IV) which cleaves several protein molecules. In order to further define the expression and functiorial activity of CD26 in the developing thymus, we utilized a nondisruptive, cytofluorogenic assay which allowed simultaneous measurement of DPP IV activity with a fluorochrome-conjugated peptide substrate and surface staining of the T lymphocyte lineage antigens CD4 and CD8. Neonatal and adult murine thymi were examined using the three-color assay and significant differences in DPP IV activity were found among the thymocyte subsets defined by their CD4/ CD8 phenotype. Single-positive cells bore higher activity than CD4-/CD8- cells and neonates had higher activity than adults. Thymocytes with characteristics consistent with apoptotic cells expressed higher DPP TV activity. Thus, DPP IV appears to be upregulated both as thymocytes mature and among thymocytes which are undergoing programmed cell death. These results suggest that CD26 is ontogenically controlled during T cell maturation and may play a role in thymic deletion of emerging clones.
| Original language | English |
|---|---|
| Pages (from-to) | 322-329 |
| Number of pages | 8 |
| Journal | Cytometry |
| Volume | 23 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 1 1996 |
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Keywords
- Apoptosis
- CD26
- Dipeptidylpeptidase IV
ASJC Scopus subject areas
- Hematology
- Cell Biology
- Pathology and Forensic Medicine
- Biophysics
- Endocrinology
Cite this
Cytofluorographic evidence that thymocyte dipeptidyl peptidase IV (CD26) activity is altered with stage of ontogeny and apoptotic status. / Ruiz, Phillip; Nassiri, Mehdi; Steele, Bernard W; Viciana, Ana L.
In: Cytometry, Vol. 23, No. 4, 01.04.1996, p. 322-329.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Cytofluorographic evidence that thymocyte dipeptidyl peptidase IV (CD26) activity is altered with stage of ontogeny and apoptotic status
AU - Ruiz, Phillip
AU - Nassiri, Mehdi
AU - Steele, Bernard W
AU - Viciana, Ana L.
PY - 1996/4/1
Y1 - 1996/4/1
N2 - CD26 is a multifunctional molecule implied to have a variety of roles in the immune response including its activity as a membrane exopeptidase (Dipeptidyl peptidase IV) which cleaves several protein molecules. In order to further define the expression and functiorial activity of CD26 in the developing thymus, we utilized a nondisruptive, cytofluorogenic assay which allowed simultaneous measurement of DPP IV activity with a fluorochrome-conjugated peptide substrate and surface staining of the T lymphocyte lineage antigens CD4 and CD8. Neonatal and adult murine thymi were examined using the three-color assay and significant differences in DPP IV activity were found among the thymocyte subsets defined by their CD4/ CD8 phenotype. Single-positive cells bore higher activity than CD4-/CD8- cells and neonates had higher activity than adults. Thymocytes with characteristics consistent with apoptotic cells expressed higher DPP TV activity. Thus, DPP IV appears to be upregulated both as thymocytes mature and among thymocytes which are undergoing programmed cell death. These results suggest that CD26 is ontogenically controlled during T cell maturation and may play a role in thymic deletion of emerging clones.
AB - CD26 is a multifunctional molecule implied to have a variety of roles in the immune response including its activity as a membrane exopeptidase (Dipeptidyl peptidase IV) which cleaves several protein molecules. In order to further define the expression and functiorial activity of CD26 in the developing thymus, we utilized a nondisruptive, cytofluorogenic assay which allowed simultaneous measurement of DPP IV activity with a fluorochrome-conjugated peptide substrate and surface staining of the T lymphocyte lineage antigens CD4 and CD8. Neonatal and adult murine thymi were examined using the three-color assay and significant differences in DPP IV activity were found among the thymocyte subsets defined by their CD4/ CD8 phenotype. Single-positive cells bore higher activity than CD4-/CD8- cells and neonates had higher activity than adults. Thymocytes with characteristics consistent with apoptotic cells expressed higher DPP TV activity. Thus, DPP IV appears to be upregulated both as thymocytes mature and among thymocytes which are undergoing programmed cell death. These results suggest that CD26 is ontogenically controlled during T cell maturation and may play a role in thymic deletion of emerging clones.
KW - Apoptosis
KW - CD26
KW - Dipeptidylpeptidase IV
UR - http://www.scopus.com/inward/record.url?scp=0029870616&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0029870616&partnerID=8YFLogxK
U2 - 10.1002/(SICI)1097-0320(19960401)23:4<322::AID-CYTO8>3.0.CO;2-I
DO - 10.1002/(SICI)1097-0320(19960401)23:4<322::AID-CYTO8>3.0.CO;2-I
M3 - Article
C2 - 8900475
AN - SCOPUS:0029870616
VL - 23
SP - 322
EP - 329
JO - Cytometry Part B - Clinical Cytometry
JF - Cytometry Part B - Clinical Cytometry
SN - 1552-4949
IS - 4
ER -