NDLI: Biphasic behavior of changes in elemental composition during staurosporine-induced apoptosis

Content Provider	Springer Nature Link
Author	Arrebola, F. Cañizares, J. Cubero, M. A. Crespo, P. V. Warley, A. Fernández Segura, E.
Copyright Year	2005
Abstract	Although the identification of events that occur during apoptosis is a fundamental goal of apoptotic cell death research, little is know about the precise sequence of changes in total elemental composition during apoptosis. We evaluated total elemental composition (Na, Mg, P, Cl, S, and K) in relation to molecular and morphological features in human U937 cells induced to undergo apoptosis with staurosporine, an intrinsic pathway activator. To evaluate total elemental content we used electron probe X-ray microanalysis to measure simultaneously all elements from single, individual cells. We observed two phases in the changes in elemental composition (mainly Na, Cl and K). The early phase was characterized by a decrease in intracellular K (P < 0.001) and Cl (P < 0.001) content concomitant with cell shrinkage, and preceded the increase in proteolytic activity associated with the activation of caspase-3. The later phase started with caspase-3 activation, and was characterized by a decrease in the K/Na ratio (P < 0.001) as a consequence of a significant decrease in K and increase in Na content. The inversion of intracellular K and Na content was related with the inhibition of Na+/K+ ATPase. This later phase was also characterized by a significant increase (P < 0.001) in intracellular Cl with respect to the early phase. In addition, we found a decrease in S content and an increase in the P/S ratio. These distinctive changes coincided with chromatin condensation and DNA fragmentation. Together, these findings support the concept that changes in total elemental composition take place in two phases related with molecular and morphological features during staurosporine-induced apoptosis.
Starting Page	1317
Ending Page	1331
Page Count	15
File Format	PDF
ISSN	13608185
Journal	Apoptosis
Volume Number	10
Issue Number	6
e-ISSN	1573675X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-10-03
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	apoptosis apoptotic volume decrease caspases chlorine electron probe X-ray microanalysis Na+/K+ ATPase PARP potassium sodium Cancer Research Virology Oncology Biochemistry Cell Biology
Content Type	Text
Resource Type	Article
Subject	Pharmaceutical Science Biochemistry (medical) Cell Biology Clinical Biochemistry Cancer Research Pharmacology

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