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Knockdown of ALOX15 alleviates acute coronary syndrome via the FGFR2/PI3K/AKT signaling pathway

  • Authors:
    • Hao Chen
    • Ning Zhu
    • Shiwei Huang
    • Fanlu Guan
    • Sisi Han
    • Fanhao Ye
    • Liyi You
  • View Affiliations / Copyright

    Affiliations: Department of Cardiovascular Medicine, The Third Affiliated Hospital of Shanghai University (Wenzhou People's Hospital), Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China, Department of Cardiovascular Medicine, The Third Affiliated Hospital of Shanghai University (Wenzhou People's Hospital), Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China, Department of Ultrasonography, The Third Affiliated Hospital of Shanghai University (Wenzhou People's Hospital), Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
    Copyright: © Chen et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 19
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    Published online on: November 25, 2025
       https://doi.org/10.3892/br.2025.2092
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Abstract

Acute coronary syndrome (ACS) is a serious cardiovascular condition and a leading cause of mortality worldwide. Notably, 12/15‑lipoxygenase (ALOX15) can be regulated by the long non‑coding RNA ENST00000538705.1, thereby facilitating the progression of ACS. However, the downstream regulatory mechanisms involving ALOX15 remain unclear. The viability and migration of human primary coronary artery endothelial cells (HCAECs) were assessed using the Cell Counting Kit‑8 and scratch assays, respectively. Reverse transcription‑quantitative PCR was performed to assess the mRNA expression levels of ALOX15 and fibroblast growth factor receptor 2 (FGFR2). Protein‑protein interactions between ALOX15 and FGFR2 were verified by co‑immunoprecipitation (CO‑IP). An ACS rat model was established to examine the effects of ALOX15 on blood lipid levels. Hematoxylin and eosin staining was executed to assess the histological changes. The levels of the FGFR2/PI3K/AKT signaling pathway‑related proteins were assessed by western blotting. The results revealed elevated expression levels of ALOX15 and FGFR2 in patients with ACS. In HCAECs, transfection of overexpressed ALOX15 markedly enhanced cell viability and migration, while small interfering RNA‑ALOX15 transfection produced the opposite effects. CO‑IP assays confirmed the interaction between ALOX15 and FGFR2 in HCAECs. Additionally, knockdown of ALOX15 reduced blood lipid levels and alleviated myocardial injury in rats with ACS. ALOX15 silencing inhibited the expression of proteins associated with the FGFR2/PI3K/AKT signaling pathway in both HCAECs and rats with ACS. Both the overexpression of FGFR2 and the supplementation with insulin like growth factor 1 (a specific agonist of the PI3K/AKT pathway) significantly mitigated the inhibitory effects of ALOX15 knockdown on the migratory and proliferative capacities of HCAECs. The findings of the present study indicated that silencing of ALOX15 alleviates ACS progression via inhibiting the FGFR2/PI3K/AKT signaling pathway, providing a theoretical basis for ACS therapy in clinic.
View Figures

Figure 1

High expression of ALOX15 and FGFR2
is observed in the serum of patients with ACS. The expression of
(A) ALOX15 and (B) FGFR2 in patients with ACS and healthy
individuals was detected by reverse transcription-quantitative PCR.
***P<0.001 vs. Healthy. ALOX15, 12/15-lipoxygenase;
FGFR2, fibroblast growth factor receptor 2; ACS, acute coronary
syndrome.

Figure 2

Effects of ALOX15 on acute coronary
syndrome progression in vitro. (A) The expression of ALOX15
in HCAECs after transfection with OE-ALOX15 or OE-NC was detected
by RT-qPCR. ***P<0.001 vs. HCAECs + OE-NC. (B) The
expression of ALOX15 in HCAECs after transfection with siRNA1
ALOX15, siRNA2 ALOX15, siRNA3 ALOX15 or siRNA NC was detected by
RT-qPCR. ***P<0.001 vs. siRNA NC. (C and D) The
migration of HCAECs transfected with OE-ALOX15/OE-NC or siRNA
ALOX15/siRNA NC was measured by scratch wound healing assays.
**P<0.01. Scale bar, 100 µm. (E) The viability of
HCAECs transfected with OE-ALOX15/OE-NC or siRNA ALOX15/siRNA NC
was measured by Cell Counting Kit-8 assays. **P<0.01
and ***P<0.001. ALOX15, 12/15-lipoxygenase; FGFR2,
fibroblast growth factor receptor 2; HCAECs, human primary coronary
artery endothelial cells; OE, overexpression; NC, negative control;
RT-qPCR, reverse transcription-quantitative PCR; siRNA, small
interfering RNA.

Figure 3

Effects of ALOX15 on the
FGFR2/PI3K/AKT signaling pathway in HCAECs. (A)
Co-immunoprecipitation assays of ALOX15 and FGFR2 in HCAECs. (B)
The mRNA expression of ALOX15 and FGFR2 in HCAECs after
transfection with OE-ALOX15/OE-NC or siRNA ALOX15/siRNA NC was
detected by reverse transcription-quantitative PCR.
***P<0.001. (C) The protein levels of ALOX15, FGFR2,
PI3K, p-PI3K, AKT and p-AKT in HCAECs after transfection with
OE-ALOX15/OE-NC or siRNA ALOX15/siRNA NC were determined by western
blotting. ***P<0.001. ALOX15, 12/15-lipoxygenase;
FGFR2, fibroblast growth factor receptor 2; HCAECs, human primary
coronary artery endothelial cells; OE, overexpression; NC, negative
control; siRNA, small interfering RNA; p-, phosphorylated; NS, not
significant.

Figure 4

Silencing of ALOX15 mitigates acute
coronary syndrome progression in vitro through the
FGFR2/PI3K/AKT signaling pathway. (A) The expression of FGFR2 in
HCAECs after transfection with OE-FGFR2 or OE-NC was detected by
RT-qPCR. (B) The mRNA expression of ALOX15 and FGFR2 in HCAECs
following different treatments was detected by RT-qPCR. (C) The
protein levels of FGFR2, PI3K, p-PI3K, AKT and p-AKT in HCAECs
following various treatments were determined by western blotting.
(D, E) The migration of HCAECs following different treatments was
assessed by scratch wound healing assays. Scale bar, 100 µm. (F)
The viability of HCAECs following various treatments was measured
by Cell Counting Kit-8 assays. *P<0.05,
**P<0.01 and ***P<0.001. ALOX15,
12/15-lipoxygenase; FGFR2, fibroblast growth factor receptor 2;
HCAECs, human primary coronary artery endothelial cells; OE,
overexpression; NC, negative control; RT-qPCR, reverse
transcription-quantitative PCR; siRNA, small interfering RNA; p-,
phosphorylated; NS, not significant.

Figure 5

Knockdown of ALOX15 reduces serum
lipid levels and improves myocardial injury in an ACS rat model.
The expression of (A) ALOX15 and (B) FGFR2 in rats with ACS after
injection of shRNA ALOX15 or shRNA NC was detected by reverse
transcription-quantitative PCR. ***P<0.001 vs. sham;
##P<0.01 and ###P<0.001 vs. ACS model +
shRNA NC. (C) The levels of TC, HDL-C and LDL-C in rats with ACS
after injection of shRNA ALOX15 or shRNA NC were determined using
biochemical tests. **P<0.01 and
***P<0.001 vs. sham; #P<0.05 vs. ACS
model + shRNA NC. (D) Hematoxylin and eosin staining for observing
the pathological condition of myocardial tissues in different
groups. Scale bars, 100 and 50 µm. ALOX15, 12/15-lipoxygenase; ACS,
acute coronary syndrome; FGFR2, fibroblast growth factor receptor
2; shRNA, short hairpin RNA; NC, negative control; TC, total
cholesterol; HDL-C, high-density lipoprotein-cholesterol; LDL-C,
low-density lipoprotein-cholesterol.

Figure 6

ALOX15 silencing suppresses the
activation of the FGFR2/PI3K/AKT signaling pathway. The protein
levels of ALOX15, FGFR2, PI3K, p-PI3K, AKT and p-AKT in rats with
ACS after injection of shRNA ALOX15 or shRNA NC were determined by
western blotting. ***P<0.001 vs. sham;
###P<0.001 vs. ACS model + shRNA NC. ALOX15,
12/15-lipoxygenase; FGFR2, fibroblast growth factor receptor 2; p-,
phosphorylated; ACS, acute coronary syndrome; shRNA, short hairpin
RNA; NC, negative control; NS, no significance.
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Copy and paste a formatted citation
Spandidos Publications style
Chen H, Zhu N, Huang S, Guan F, Han S, Ye F and You L: Knockdown of ALOX15 alleviates acute coronary syndrome via the FGFR2/PI3K/AKT signaling pathway. Biomed Rep 24: 19, 2026.
APA
Chen, H., Zhu, N., Huang, S., Guan, F., Han, S., Ye, F., & You, L. (2026). Knockdown of ALOX15 alleviates acute coronary syndrome via the FGFR2/PI3K/AKT signaling pathway. Biomedical Reports, 24, 19. https://doi.org/10.3892/br.2025.2092
MLA
Chen, H., Zhu, N., Huang, S., Guan, F., Han, S., Ye, F., You, L."Knockdown of ALOX15 alleviates acute coronary syndrome via the FGFR2/PI3K/AKT signaling pathway". Biomedical Reports 24.2 (2026): 19.
Chicago
Chen, H., Zhu, N., Huang, S., Guan, F., Han, S., Ye, F., You, L."Knockdown of ALOX15 alleviates acute coronary syndrome via the FGFR2/PI3K/AKT signaling pathway". Biomedical Reports 24, no. 2 (2026): 19. https://doi.org/10.3892/br.2025.2092
Copy and paste a formatted citation
x
Spandidos Publications style
Chen H, Zhu N, Huang S, Guan F, Han S, Ye F and You L: Knockdown of ALOX15 alleviates acute coronary syndrome via the FGFR2/PI3K/AKT signaling pathway. Biomed Rep 24: 19, 2026.
APA
Chen, H., Zhu, N., Huang, S., Guan, F., Han, S., Ye, F., & You, L. (2026). Knockdown of ALOX15 alleviates acute coronary syndrome via the FGFR2/PI3K/AKT signaling pathway. Biomedical Reports, 24, 19. https://doi.org/10.3892/br.2025.2092
MLA
Chen, H., Zhu, N., Huang, S., Guan, F., Han, S., Ye, F., You, L."Knockdown of ALOX15 alleviates acute coronary syndrome via the FGFR2/PI3K/AKT signaling pathway". Biomedical Reports 24.2 (2026): 19.
Chicago
Chen, H., Zhu, N., Huang, S., Guan, F., Han, S., Ye, F., You, L."Knockdown of ALOX15 alleviates acute coronary syndrome via the FGFR2/PI3K/AKT signaling pathway". Biomedical Reports 24, no. 2 (2026): 19. https://doi.org/10.3892/br.2025.2092
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