, Volume 15, Issue 5, pp 586–596

The release of microparticles by Jurkat leukemia T cells treated with staurosporine and related kinase inhibitors to induce apoptosis

Original Paper

DOI: 10.1007/s10495-010-0470-3

Cite this article as:
Ullal, A.J. & Pisetsky, D.S. Apoptosis (2010) 15: 586. doi:10.1007/s10495-010-0470-3


Microparticles (MPs) are small membrane-bound vesicles released from cells undergoing activation or cell death. These particles display potent biological activities that can impact on physiologic and pathologic processes. Previous studies with the Jurkat T leukemia cell line demonstrated that staurosporine (STS) induces the release of MPs as cells undergo apoptosis. To investigate further this process, we tested the effects of STS, its analogue, 7-hydroxystaurosporine (UCN-01), and other protein kinase C (PKC) and cyclin-dependent kinase (CDK) inhibitors. FACS analysis was used to assess MP release. Results of these studies indicate that STS and UCN-01 induce MP release by Jurkat cells; in contrast, other PKC and CDK inhibitors failed to induce comparable release, suggesting that release does not result from simple inhibition of either kinase alone. Time course experiments indicated that STS-induced particle release occurred as early as 2 h after treatment, with the early release MPs displaying low levels of binding of annexin V and propidium iodide (PI). Early-release MPs, however, matured in culture to an annexin V- and PI-positive phenotype. Together, these results indicate that STS and UCN-01 induce MPs that are phenotypically distinct and reflect specific patterns of kinase inhibition during apoptosis.


MicroparticlesApoptosisProtein kinase CCyclin-dependent kinaseStaurosporine

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Division of Rheumatology and Immunology, Department of MedicineDuke UniversityDurhamUSA
  2. 2.Medical Research ServiceDurham Veterans Administration Medical CenterDurhamUSA
  3. 3.VA Medical CenterDurhamUSA