The role of caspase activation and mitochondrial depolarisation in cultured human apoptotic eosinophils

Faris Q. Alenzi, Badi Q. Alenazi, Fatma H. AL-anazy, Abdulla M. Mubaraki, Mohamed L. Salem, Ali A. Al-Jabri, Mahmoud Lotfy, Mohammad S. Bamaga, Mohammed W. AlRabia, Richard K H Wyse

Research output: Contribution to journalArticle

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Abstract

Caspases are key intracellular molecules in the control of apoptosis, but little is known concerning their relative contribution to the cascade of events leading to eosinophil apoptosis. We examined caspase-3, -8, and -9 activities in receptor ligation dependent apoptosis induction in the cultured eosinophils (CE). CE cultured alone for 48 hours exhibited constitutive apoptosis (12% ± 1.2). Significant (P <0.05) enhancement of eosinophil apoptosis was observed following monoclonal antibody (Mab) treatment with CD45 (40% ± 0.7), CD95 (36% ± 1.6), or CD69 (34% ± 0.2). Caspase activity was analysed using the novel CaspaTagTM technique and flow cytometry. CE ligated with CD45 (Bra55), CD95 (Fas) and CD69 Mab resulted in caspase-3 and -9 activation after 16 hours post-ligation. This trend in caspase-3 and -9 activation continued to increase significantly through to the 20 and 24 hours time points when compared to isotype control. Activated up-stream caspase-8 was detected 16 and 20 hours after treatment with CD45, CD95 and CD69 Mab followed by a trend toward basal levels at 24 hours. Ligation of CD95 was followed by mitochondrial permeabilization, as demonstrated by marked increase in mitochondrial transmembrane potential (Δ Ψm) at all time points. However, ligation with CD45 and CD69 failed to induce a change in Δ Ψm at 16 hours post-treatment compared to isotype control even though there was an alteration in mitochondrial downstream-caspase activity following ligation with these Mab(s) at this time point. At 20 and 24 hours post-ligation, CD45 or CD69 induce significantly altered levels of Δ Ψm. Thus, the intrinsic and extrinsic caspase pathways are involved in controlling receptor ligation-mediated apoptosis induction in human eosinophils, findings that may aid the development of a more targeted, anti inflammatory therapy for asthma.

Original languageEnglish
Pages (from-to)29-36
Number of pages8
JournalSaudi Journal of Biological Sciences
Volume17
Issue number1
DOIs
Publication statusPublished - Jan 2010

Fingerprint

caspases
eosinophils
Caspases
Eosinophils
Ligation
apoptosis
Apoptosis
monoclonal antibodies
caspase-3
Monoclonal Antibodies
Caspase 3
Caspase 9
Caspase 8
caspase-8
development aid
receptors
asthma
membrane potential
flow cytometry
Membrane Potentials

Keywords

  • Apoptosis
  • Asthma
  • Caspases
  • Eosinophils
  • Mitochondria

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

Cite this

The role of caspase activation and mitochondrial depolarisation in cultured human apoptotic eosinophils. / Alenzi, Faris Q.; Alenazi, Badi Q.; AL-anazy, Fatma H.; Mubaraki, Abdulla M.; Salem, Mohamed L.; Al-Jabri, Ali A.; Lotfy, Mahmoud; Bamaga, Mohammad S.; AlRabia, Mohammed W.; Wyse, Richard K H.

In: Saudi Journal of Biological Sciences, Vol. 17, No. 1, 01.2010, p. 29-36.

Research output: Contribution to journalArticle

Alenzi, FQ, Alenazi, BQ, AL-anazy, FH, Mubaraki, AM, Salem, ML, Al-Jabri, AA, Lotfy, M, Bamaga, MS, AlRabia, MW & Wyse, RKH 2010, 'The role of caspase activation and mitochondrial depolarisation in cultured human apoptotic eosinophils', Saudi Journal of Biological Sciences, vol. 17, no. 1, pp. 29-36. https://doi.org/10.1016/j.sjbs.2009.12.005
Alenzi, Faris Q. ; Alenazi, Badi Q. ; AL-anazy, Fatma H. ; Mubaraki, Abdulla M. ; Salem, Mohamed L. ; Al-Jabri, Ali A. ; Lotfy, Mahmoud ; Bamaga, Mohammad S. ; AlRabia, Mohammed W. ; Wyse, Richard K H. / The role of caspase activation and mitochondrial depolarisation in cultured human apoptotic eosinophils. In: Saudi Journal of Biological Sciences. 2010 ; Vol. 17, No. 1. pp. 29-36.
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