DOI: 10.1182/blood.v91.3.991.991_991_1000. Elevated Expression of the Apoptotic Regulator Mcl-1 at the Time of Leukemic Relapse

Elevated Expression of the Apoptotic Regulator Mcl-1 at the Time of Leukemic Relapse

10.1182/blood.v91.3.991.991_991_1000

Crossref journal-article

American Society of Hematology

Blood (234)

Abstract

Bcl-2, Bcl-xL, and Mcl-1 are three related intracellular polypeptides that have been implicated as negative regulators of apoptosis. In contrast, the partner protein Bax acts as a positive regulator of apoptosis. Based on the observation that all four of these polypeptides are expressed in a variety of acute myelogenous leukemia (AML) and acute lymphocytic leukemia (ALL) cell lines, cellular levels of these polypeptides were examined by immunoblotting in bone marrow samples harvested from 123 adult AML patients and 36 adult ALL patients before initial antileukemic therapy. Levels of Bcl-2, Mcl-1, Bcl-xL, and Bax each varied over a more than 10-fold range in different pretreatment leukemia specimens. When the 54 AML and 23 ALL samples that contained greater than 80% malignant cells were examined in greater detail, it was observed that pretreatment levels of Bcl-2 and Mcl-1 correlated with each other (R = .44,P < .001 for AML and R = .79,P < .0001 for ALL). In addition, a weak negative correlation between Bax expression and age was observed in AML samples (R = −0.35, P < .02) but not ALL samples. There was no relationship between pretreatment levels of these polypeptides and response to initial therapy. However, examination of 19 paired samples (the first harvested before chemotherapy and the second harvested 23 to 290 days later at the time of leukemic recurrence) revealed a greater than or equal to twofold increase in Mcl-1 levels in 10 of 19 pairs (7 of 15 AML and 3 of 4 ALL) at recurrence. In contrast, 2 of 19 pairs contained twofold less Mcl-1 at the time of recurrence. Approximately equal numbers of samples showed twofold increases and decreases in Bcl-2 (5 increases, 3 decreases) and Bcl-xL (1 increase, 4 decreases) at recurrence. Bax levels did not show a twofold decrease in any patient. These results, coupled with recent observations that cells overexpressing Mcl-1 are resistant to a variety of chemotherapeutic agents, raise the possibility that some chemotherapeutic regimens might select for leukemia cells with elevated levels of this particular apoptosis inhibitor.

Bibliography

Kaufmann, S. H., Karp, J. E., Svingen, P. A., Krajewski, S., Burke, P. J., Gore, S. D., & Reed, J. C. (1998). Elevated Expression of the Apoptotic Regulator Mcl-1 at the Time of Leukemic Relapse. Blood, 91(3), 991â1000.

Authors 7

Scott H. Kaufmann (first)
Judith E. Karp (additional)
Phyllis A. Svingen (additional)
Stan Krajewski (additional)
Philip J. Burke (additional)
Steven D. Gore (additional)
John C. Reed (additional)

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Dates

Type	When
Created	5 years, 10 months ago (Oct. 13, 2019, 10:06 a.m.)
Deposited	2 years, 11 months ago (Oct. 1, 2022, 12:05 p.m.)
Indexed	2 days, 16 hours ago (Sept. 3, 2025, 6:40 a.m.)
Issued	27 years, 7 months ago (Feb. 1, 1998)
Published	27 years, 7 months ago (Feb. 1, 1998)
Published Print	27 years, 7 months ago (Feb. 1, 1998)

Funders 0

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BibTeX

@article{Kaufmann_1998, title={Elevated Expression of the Apoptotic Regulator Mcl-1 at the Time of Leukemic Relapse}, volume={91}, ISSN={0006-4971}, url={http://dx.doi.org/10.1182/blood.v91.3.991.991_991_1000}, DOI={10.1182/blood.v91.3.991.991_991_1000}, number={3}, journal={Blood}, publisher={American Society of Hematology}, author={Kaufmann, Scott H. and Karp, Judith E. and Svingen, Phyllis A. and Krajewski, Stan and Burke, Philip J. and Gore, Steven D. and Reed, John C.}, year={1998}, month=feb, pages={991–1000} }

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  "abstract": "<jats:p>Bcl-2, Bcl-xL, and Mcl-1 are three related intracellular polypeptides that have been implicated as negative regulators of apoptosis. In contrast, the partner protein Bax acts as a positive regulator of apoptosis. Based on the observation that all four of these polypeptides are expressed in a variety of acute myelogenous leukemia (AML) and acute lymphocytic leukemia (ALL) cell lines, cellular levels of these polypeptides were examined by immunoblotting in bone marrow samples harvested from 123 adult AML patients and 36 adult ALL patients before initial antileukemic therapy. Levels of Bcl-2, Mcl-1, Bcl-xL, and Bax each varied over a more than 10-fold range in different pretreatment leukemia specimens. When the 54 AML and 23 ALL samples that contained greater than 80% malignant cells were examined in greater detail, it was observed that pretreatment levels of Bcl-2 and Mcl-1 correlated with each other (R\u2009=\u2009.44,P\u2009&lt;\u2009.001 for AML and R\u2009=\u2009.79,P\u2009&lt;\u2009.0001 for ALL). In addition, a weak negative correlation between Bax expression and age was observed in AML samples (R\u2009=\u2009\u22120.35, P\u2009&lt;\u2009.02) but not ALL samples. There was no relationship between pretreatment levels of these polypeptides and response to initial therapy. However, examination of 19 paired samples (the first harvested before chemotherapy and the second harvested 23 to 290 days later at the time of leukemic recurrence) revealed a greater than or equal to twofold increase in Mcl-1 levels in 10 of 19 pairs (7 of 15 AML and 3 of 4 ALL) at recurrence. In contrast, 2 of 19 pairs contained twofold less Mcl-1 at the time of recurrence. Approximately equal numbers of samples showed twofold increases and decreases in Bcl-2 (5 increases, 3 decreases) and Bcl-xL (1 increase, 4 decreases) at recurrence. Bax levels did not show a twofold decrease in any patient. These results, coupled with recent observations that cells overexpressing Mcl-1 are resistant to a variety of chemotherapeutic agents, raise the possibility that some chemotherapeutic regimens might select for leukemia cells with elevated levels of this particular apoptosis inhibitor.</jats:p>",
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