Secreted cystatins decrease proliferation and enhance apoptosis of human leukemic cells
(2020) In FEBS Open Bio 10(10). p.2166-2181- Abstract
Cysteine proteases are implicated in proteolysis events favoring cancer cell growth, spread, and death by apoptosis. Herein, we have studied whether the net growth and survival of the leukemic cell lines Jurkat, U937, and HL-60 are affected by external addition of five proteins acting as natural cysteine protease inhibitors. None of the cystatins examined (A, C, D, and E/M) or chagasin showed consistent effects on Fas-induced apoptosis when evaluated at 1 µm. In contrast, when the intrinsic apoptosis pathway was activated by hydrogen peroxide, addition of cystatin D augmented caspase-3-like activity within all three cell lines. Flow cytometric analysis of U937 cells also showed increased numbers of annexin V-positive cells when hydrogen... (More)
Cysteine proteases are implicated in proteolysis events favoring cancer cell growth, spread, and death by apoptosis. Herein, we have studied whether the net growth and survival of the leukemic cell lines Jurkat, U937, and HL-60 are affected by external addition of five proteins acting as natural cysteine protease inhibitors. None of the cystatins examined (A, C, D, and E/M) or chagasin showed consistent effects on Fas-induced apoptosis when evaluated at 1 µm. In contrast, when the intrinsic apoptosis pathway was activated by hydrogen peroxide, addition of cystatin D augmented caspase-3-like activity within all three cell lines. Flow cytometric analysis of U937 cells also showed increased numbers of annexin V-positive cells when hydrogen peroxide was used to initiate apoptosis and cells were cultured in the presence of cystatin D or C. Moreover, stimulation of hydrogen peroxide-induced apoptotic U937 cells with either cystatin C or D resulted in a dose-dependent decrease in the number of cells. Cell viability was also decreased when U937 cells were cultured in the presence of cystatin C or D (1–9 µm) only, demonstrating that these cystatins can reduce cell proliferation by themselves in addition to enhancing apoptosis induced by oxidative stress. These effects on U937 cells were paralleled by internalization of cystatins C and D, indicating these effects are caused by downregulation of intracellular proteolysis. External addition of cystatins C and D to HL-60 and Jurkat cells demonstrated similar degrees of cystatin D uptake and decreased viability as for U937 cells, indicating that these effects are general for leukemic cells.
(Less)
- author
- Hunaiti, Samar LU ; Wallin, Hanna LU ; Eriksson, Mia LU ; Järås, Marcus LU and Abrahamson, Magnus LU
- organization
- publishing date
- 2020-10-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- caspase-3, cystatin C, cystatin D, cysteine peptidase, cysteine protease, protease inhibitor
- in
- FEBS Open Bio
- volume
- 10
- issue
- 10
- pages
- 16 pages
- publisher
- Wiley-Blackwell
- external identifiers
-
- scopus:85091318537
- pmid:32810913
- ISSN
- 2211-5463
- DOI
- 10.1002/2211-5463.12958
- language
- English
- LU publication?
- yes
- id
- 1d9aa185-83df-416a-8e44-9dd59c58d97a
- date added to LUP
- 2020-10-28 15:01:16
- date last changed
- 2024-06-12 23:00:57
@article{1d9aa185-83df-416a-8e44-9dd59c58d97a,
abstract = {{<p>Cysteine proteases are implicated in proteolysis events favoring cancer cell growth, spread, and death by apoptosis. Herein, we have studied whether the net growth and survival of the leukemic cell lines Jurkat, U937, and HL-60 are affected by external addition of five proteins acting as natural cysteine protease inhibitors. None of the cystatins examined (A, C, D, and E/M) or chagasin showed consistent effects on Fas-induced apoptosis when evaluated at 1 µm. In contrast, when the intrinsic apoptosis pathway was activated by hydrogen peroxide, addition of cystatin D augmented caspase-3-like activity within all three cell lines. Flow cytometric analysis of U937 cells also showed increased numbers of annexin V-positive cells when hydrogen peroxide was used to initiate apoptosis and cells were cultured in the presence of cystatin D or C. Moreover, stimulation of hydrogen peroxide-induced apoptotic U937 cells with either cystatin C or D resulted in a dose-dependent decrease in the number of cells. Cell viability was also decreased when U937 cells were cultured in the presence of cystatin C or D (1–9 µm) only, demonstrating that these cystatins can reduce cell proliferation by themselves in addition to enhancing apoptosis induced by oxidative stress. These effects on U937 cells were paralleled by internalization of cystatins C and D, indicating these effects are caused by downregulation of intracellular proteolysis. External addition of cystatins C and D to HL-60 and Jurkat cells demonstrated similar degrees of cystatin D uptake and decreased viability as for U937 cells, indicating that these effects are general for leukemic cells.</p>}},
author = {{Hunaiti, Samar and Wallin, Hanna and Eriksson, Mia and Järås, Marcus and Abrahamson, Magnus}},
issn = {{2211-5463}},
keywords = {{caspase-3; cystatin C; cystatin D; cysteine peptidase; cysteine protease; protease inhibitor}},
language = {{eng}},
month = {{10}},
number = {{10}},
pages = {{2166--2181}},
publisher = {{Wiley-Blackwell}},
series = {{FEBS Open Bio}},
title = {{Secreted cystatins decrease proliferation and enhance apoptosis of human leukemic cells}},
url = {{http://dx.doi.org/10.1002/2211-5463.12958}},
doi = {{10.1002/2211-5463.12958}},
volume = {{10}},
year = {{2020}},
}