Research Article

DOI :10.26650/JARHS2025-1742670 IUP :10.26650/JARHS2025-1742670 Full Text (PDF)

The lncRNA ATB–miR-200b Axis: Drug-Specific Regulation by Doxorubicin and Paclitaxel in ER-Positive Breast Cancer

Fatma Hande Karpuzoğlu, Ezgi Nurdan Yenilmez Tunoğlu

Objective: This study aimed to examine the expression patterns of long non-coding RNA ATB and microRNA-200b (miR-200b) in MCF-7 human breast cancer cells after treatment with two commonly used chemotherapeutic agents: doxorubicin (DOX) and paclitaxel (PTX). The goal was to determine whether the ATB–miR-200b regu latory axis influences drug-specific responses.

Materials and Methods: MCF-7 cells were treated with IC₅₀ concentrations of DOX and PTX for 48 h. Total RNA was extracted, and cDNA was synthesised for both lncRNA and miRNA fractions. The expression levels of ATB and miR-200b were measured using quantitative real-time PCR (RT-qPCR). GAPDH and U6 served as internal references. Relative quantification was carried out using the 2−ΔΔCt method.

Results: lncRNA ATB expression was significantly decreased in both treatment groups (p < 0.05). Interestingly, miR-200b expression was decreased in PTX-treated cells but moderately increased in DOX treated cells. These results indicate a different regulatory response of the ATB–miR-200b axis depending on the chemotherapeutic agent used.

Conclusion: Our findings show that ATB and miR-200b respond differently to DOX and PTX exposure in MCF-7 cells. The simulta neous decrease of ATB and miR-200b in response to PTX may indicate EMT-related resistance mechanisms, whereas the increase of miR-200b in DOX-treated cells may be linked to apoptotic activation. More research is needed to understand the role of this regulatory axis in chemotherapy response.

Keywords: Breast cancer, MCF-7 cell line, lncRNA ATB, miR-200b, doxorubicin, paclitaxel, RT-qPCR

DOI :10.26650/JARHS2025-1742670 IUP :10.26650/JARHS2025-1742670 Full Text (PDF)

lncRNA ATB-miR200b Aksisi: ER-Pozitif Meme Kanserinde Doksorubisin ve Paklitaksel ile İlaç Spesifik Düzenlenmesi

Fatma Hande Karpuzoğlu, Ezgi Nurdan Yenilmez Tunoğlu

Amaç: Bu çalışma, sık kullanılan iki kemoterapötik ajan olan doksorubisin (DOX) ve paklitaksel (PTX) uygulaması sonrasında insan meme kanseri hücre hattı MCF-7’de uzun kodlamayan RNA ATB (lncRNA ATB) ve mikroRNA-200b (miR-200b) ekspresyon paternlerini incelemeyi amaçlamıştır. Çalışmanın bir diğer amacı, ATB–miR-200b düzenleyici aksının ilaç-spesifik yanıtları etkileyip etkilemediğini ortaya koymaktır.

Gereç ve Yöntemler: MCF-7 hücreleri, DOX ve PTX’in IC₅₀ konsantrasyonlarıyla 48 saat süreyle muamele edilmiştir. Toplam RNA izole edilmiş, lncRNA ve miRNA fraksiyonları için cDNA sentezi yapılmıştır. ATB ve miR-200b ekspresyon düzeyleri kantitatif gerçek zamanlı PCR (RT-qPCR) yöntemiyle ölçülmüştür. lncRNA için GAPDH, miRNA için ise U6 referans gen olarak kullanılmıştır. Rölatif kantifikasyon 2−ΔΔCt yöntemi ile hesaplanmıştır.

Bulgular: lncRNA ATB ekspresyonu her iki tedavi grubunda da anlamlı düzeyde azalmıştır (p < 0,05). İlginç şekilde, miR-200b PTX ile muamele edilen hücrelerde azalmış, DOX ile muamele edilen hücrelerde ise orta derecede artış göstermiştir. Bu sonuçlar, kullanılan kemoterapötik ajana bağlı olarak ATB–miR-200b aksının farklı düzenleyici yanıtlar verebileceğini göstermektedir.

Sonuç: Bulgularımız, ATB ve miR-200b’nin MCF-7 hücrelerinde DOX ve PTX uygulamasına farklı yanıtlar verdiğini ortaya koymak tadır. PTX’e yanıt olarak hem ATB hem de miR-200b ekspresyonunun azalması, EMT (epitelyal-mezenkimal geçiş) ile ilişkili direnç mekanizmalarını düşündürmektedir. DOX uygulamasında miR-200b düzeyinin artması ise apoptoz aktivasyonu ile ilişkili olabilir. Bu düzenleyici aksın kemoterapi yanıtındaki rolünü netleştirmek için ileri çalışmalara ihtiyaç vardır.

Keywords: Meme kanseri, MCF-7 hücre hattı, lncRNA ATB, miR-200b, Doksorubisin, Paklitaksel, RT-qPCR

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APA

Karpuzoğlu, F.H., & Yenilmez Tunoğlu, E. (2019). The lncRNA ATB–miR-200b Axis: Drug-Specific Regulation by Doxorubicin and Paclitaxel in ER-Positive Breast Cancer. Journal of Advanced Research in Health Sciences, 0(0), -. https://doi.org/10.26650/JARHS2025-1742670

AMA

Karpuzoğlu F H, Yenilmez Tunoğlu E. The lncRNA ATB–miR-200b Axis: Drug-Specific Regulation by Doxorubicin and Paclitaxel in ER-Positive Breast Cancer. Journal of Advanced Research in Health Sciences. 2019;0(0):-. https://doi.org/10.26650/JARHS2025-1742670

ABNT

Karpuzoğlu, F.H.; Yenilmez Tunoğlu, E. The lncRNA ATB–miR-200b Axis: Drug-Specific Regulation by Doxorubicin and Paclitaxel in ER-Positive Breast Cancer. Journal of Advanced Research in Health Sciences, [Publisher Location], v. 0, n. 0, p. -, 2019.

Chicago: Author-Date Style

Karpuzoğlu, Fatma Hande, and Ezgi Nurdan Yenilmez Tunoğlu. 2019. “The lncRNA ATB–miR-200b Axis: Drug-Specific Regulation by Doxorubicin and Paclitaxel in ER-Positive Breast Cancer.” Journal of Advanced Research in Health Sciences 0, no. 0: -. https://doi.org/10.26650/JARHS2025-1742670

Chicago: Humanities Style

Karpuzoğlu, Fatma Hande, and Ezgi Nurdan Yenilmez Tunoğlu. “The lncRNA ATB–miR-200b Axis: Drug-Specific Regulation by Doxorubicin and Paclitaxel in ER-Positive Breast Cancer.” Journal of Advanced Research in Health Sciences 0, no. 0 (Sep. 2025): -. https://doi.org/10.26650/JARHS2025-1742670

Harvard: Australian Style

Karpuzoğlu, FH & Yenilmez Tunoğlu, E 2019, 'The lncRNA ATB–miR-200b Axis: Drug-Specific Regulation by Doxorubicin and Paclitaxel in ER-Positive Breast Cancer', Journal of Advanced Research in Health Sciences, vol. 0, no. 0, pp. -, viewed 25 Sep. 2025, https://doi.org/10.26650/JARHS2025-1742670

Harvard: Author-Date Style

Karpuzoğlu, F.H. and Yenilmez Tunoğlu, E. (2019) ‘The lncRNA ATB–miR-200b Axis: Drug-Specific Regulation by Doxorubicin and Paclitaxel in ER-Positive Breast Cancer’, Journal of Advanced Research in Health Sciences, 0(0), pp. -. https://doi.org/10.26650/JARHS2025-1742670 (25 Sep. 2025).

MLA

Karpuzoğlu, Fatma Hande, and Ezgi Nurdan Yenilmez Tunoğlu. “The lncRNA ATB–miR-200b Axis: Drug-Specific Regulation by Doxorubicin and Paclitaxel in ER-Positive Breast Cancer.” Journal of Advanced Research in Health Sciences, vol. 0, no. 0, 2019, pp. -. [Database Container], https://doi.org/10.26650/JARHS2025-1742670

Vancouver

Karpuzoğlu FH, Yenilmez Tunoğlu E. The lncRNA ATB–miR-200b Axis: Drug-Specific Regulation by Doxorubicin and Paclitaxel in ER-Positive Breast Cancer. Journal of Advanced Research in Health Sciences [Internet]. 25 Sep. 2025 [cited 25 Sep. 2025];0(0):-. Available from: https://doi.org/10.26650/JARHS2025-1742670 doi: 10.26650/JARHS2025-1742670

ISNAD

Karpuzoğlu, FatmaHande - Yenilmez Tunoğlu, Ezgi Nurdan. “The lncRNA ATB–miR-200b Axis: Drug-Specific Regulation by Doxorubicin and Paclitaxel in ER-Positive Breast Cancer”. Journal of Advanced Research in Health Sciences 0/0 (Sep. 2025): -. https://doi.org/10.26650/JARHS2025-1742670

TIMELINE

Submitted	16.07.2025
Accepted	19.08.2025
Published Online	11.09.2025

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