TCL-318 Evaluation of the Antitumor Activity of Amiloride in Peripheral T-Cell Lymphomas Using In-Vitro Models.
CLINICAL LYMPHOMA, MYELOMA & LEUKEMIA 2022;
22 Suppl 2:S399. [PMID:
36164128 DOI:
10.1016/s2152-2650(22)01577-4]
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Abstract
CONTEXT
Peripheral T-cell lymphomas (PTCL) have an aggressive clinical behavior and poor response to treatment; therefore, the search for new drugs is required. We have previously demonstrated the antitumor activity of amiloride in multiple myeloma. This prompted us to investigate the possibility of a cytotoxic effect of amiloride in this kind of T-cell lymphoma.
OBJECTIVE
To evaluate the antitumor activity of amiloride in different PTCL using in-vitro assays and identify the possible mechanisms involved.
DESIGN
Two anaplastic large-cell lymphoma (ALCL) cell lines, KARPAS-299 and SR-786, and two cutaneous T-cell lymphoma cell lines, HH and HuT-78 (Sézary syndrome), were used. Cell viability and apoptosis were studied after exposure to different increasing concentrations of the drug at 24, 48, and 72 hours by colorimetric MTT and annexin V/propidium iodide double-labeling assays, respectively.
RESULTS
Amiloride significantly inhibited cell growth in the PTCL cell lines, depending on increasing drug concentration and time. Inhibition was statistically significant (P<0.05) from 0.15 mM for KARPAS-299, SR-786, and HH at 24, 48, and 72 hours and from 0.3 mM for HuT-78 at 48 and 72 hours. KARPAS-299 and SR-786 were the most sensitive cell lines to amiloride exposure, whereas HuT-78 cells were less sensitive, although with the highest concentration of amiloride, its cell viability decreased to levels below 50% and 40% at 48 and 72 hours, respectively. Induction of cell death by apoptosis was detected in all cell lines, with apoptosis levels up to 25% at 24 hours and more than 80% at 48 and 72 hours using intermediate doses of the drug.
CONCLUSIONS
1) Amiloride significantly decreased the cell viability of PTCL. 2) ALCL cell lines were the most sensitive to amiloride exposure. 3) The cytotoxic effect induced by amiloride in PTCL was mediated by apoptosis. Ongoing Objectives: To evaluate apoptosis as the possible mechanism of cell death induction through the analysis of caspases, synergism with drugs commonly used in the treatment of PTCL, and changes in gene and protein expression induced by amiloride.
FUNDING
Regional Health Management of Castilla y León (GRS 2142/A/2020);); Carlos III Health Institute European Union (PI19/00674); AECC (PROYE20047GUTI).
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