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Drug Resistance Mechanisms in Human Cancer Cells to Anticancer Drugs

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Pharmacology".

Deadline for manuscript submissions: 20 September 2025 | Viewed by 436

Special Issue Editor

Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ 85721, USA
Interests: DNA chemistry; Drug-DNA interaction; G-quadruplex-interactive drugs; anticancer drug discovery; mechanism of actions of new anticancer drugs; transcription factors; DNA repair

Special Issue Information

Dear Colleagues,

The development of resistance to anticancer agents within human cancer cells remains an important area of scientific and clinical investigation. Cancer cells acquire resistance through various mechanisms. New capabilities for repairing DNA damage can arise in response to cytotoxic therapies. Targeted therapies may lose their efficacy due to mutations in the target proteins or epigenetic changes in the expression levels. Cancer cells may even develop mechanisms to inactivate drugs directly. Additionally, resistance arises over time as a result of new mutations. Even as some cells within a tumour remain susceptible to a given treatment, other cells may develop resistance and persist. As a result, a therapeutic strategy that is of interest in new cancer drug development is the use of small molecule inhibitors to target drug resistance mechanisms. This Special Issue, “Drug Resistance Mechanisms in Human Cancer Cells to Anticancer Drugs”, welcomes original research and review articles in the field with a focus on, but not limited to, the molecular and mechanistic basis for drug resistance mechanisms in human cancer cells, as well as new therapeutic strategies for countering these resistance mechanisms.

Dr. Daekyu Sun
Guest Editor

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Keywords

  • cancer therapy
  • targeted therapy
  • combination therapy
  • drug resistance
  • resensitization
  • DNA repair
  • DNA damage response
  • DNA repair inhibitors
  • synthetic lethality
  • chemoradiation

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Published Papers (1 paper)

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Research

16 pages, 2106 KiB  
Article
ERα36 Promotes MDR1-Mediated Adriamycin Resistance via Non-Genomic Signaling in Triple-Negative Breast Cancer
by Muslimbek Mukhammad Ugli Poyonov, Anh Thi Ngoc Bui, Seung-Yeon Lee, Gi-Ho Lee and Hye-Gwang Jeong
Int. J. Mol. Sci. 2025, 26(15), 7200; https://doi.org/10.3390/ijms26157200 - 25 Jul 2025
Abstract
Drug resistance remains a critical barrier to effective treatment in several cancers, particularly triple-negative breast cancer (TNBC). Estrogen receptor α36 (ERα36), a variant of the estrogen receptor in ER-negative breast cancer cells, plays important roles in cancer cell proliferation. We investigated the role [...] Read more.
Drug resistance remains a critical barrier to effective treatment in several cancers, particularly triple-negative breast cancer (TNBC). Estrogen receptor α36 (ERα36), a variant of the estrogen receptor in ER-negative breast cancer cells, plays important roles in cancer cell proliferation. We investigated the role of ERα36 in regulating multidrug resistance protein 1 (MDR1) in MDA-MB-231 human breast cancer cells. The activation of ERα36 by BSA-conjugated estradiol (BSA-E2) increased cell viability under Adriamycin exposure, suggesting its involvement in promoting drug resistance. BSA-E2 treatment significantly reduced the intracellular rhodamine-123 levels by activating the MDR1 efflux function, which was linked to increased MDR1 transcription and protein expression. The mechanical ERα36-mediated BSA-E2-induced activation of EGFR and downstream signaling via c-Src led to an activation of the Akt/ERK pathways and transcription factors, NF-κB and CREB. Additionally, ERα36 is involved in activating Wnt/β-catenin pathways to induce MDR1 expression. The silencing of ERα36 inhibited the BSA-E2-induced phosphorylation of Akt and ERK, thereby reducing MDR1 expression via downregulation of NF-κB and CREB as well as Wnt/β-catenin signaling. These findings demonstrated that ERα36 promotes MDR1 expression through multiple non-genomic signaling cascades, including Akt/ERK-NF-κB/CREB and Wnt/β-catenin pathways, and highlight the role of ERα36 as a promising target to enhance chemotherapeutic efficacy in TNBC. Full article
(This article belongs to the Special Issue Drug Resistance Mechanisms in Human Cancer Cells to Anticancer Drugs)
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