Jagged 1 Regulates The Proliferation and Metastasis of Human MDA-T68 Thyroid Cancer Cells

Document Type : Original Article

Authors

Department of General Surgery, Affiliated Haian Hospital of Nantong University, Haian, China

Abstract

Objective: The current study evaluated the expression profile and explored the therapeutic implications of Jagged 1
in human thyroid cancer.

Materials and Methods: This experimental study was conducted in 60 paired specimens of papillary thyroid and
adjacent normal tissues. Gene expression was determined by quantitative real time polymerase chain reaction
(qRT-PCR) and western blotting. Transfection of cancer cells was performed by using Lipofectamine 2000. The cell
proliferation of PTC cells was estimated by MTT assay. Clonogenic assay was performed for analysis of colony forming
potential of cancer cells. The apoptosis of PTC cells was studied by using AO/EB and Annexin V-FITC/PI staining
methods. Flow cytometry was done to analyze the cell cycle phase distribution of cancer cells. Migration and invasion
PTC cells were determined respectively with the wound-healing and transwell assays. The impact of Jagged 1 silencing
was investigated in vivo in a xenografted mice model followed by Immunohistochemistry (IHC) analysis.

Results: We found significant (P<0.05) upregulation of Jagged 1 in human thyroid cancer. Silencing of Jagged 1 caused
significant (P<0.05) reduction in proliferation and colony formation of MDA-T68 cells. The inhibitory effects of Jagged
1 silencing were found to be due to the induction of apoptosis. We also found enhancement of Bax and repression of
Bcl-2 protein levels in MDA-T68 cells. Wound healing assay indicated significant (P<0.05) inhibition of cell migration of
MDA-T68 thyroid cancer cells. Additionally, we found that invasion of the thyroid cancer cells was reduced by 55% upon
silencing of Jagged 1. Moreover, Jagged 1 silencing was found to cause inhibition of the Notch intracellular domain
(NICD) and Notch target gene, Hes-1 expression. Finally, Jagged 1 silencing inhibited the xenografted tumors in vivo.

Conclusion: The findings suggest that Jagged 1 regulates the development of thyroid cancer that may act as a
therapeutic target for managing thyroid cancer.

Keywords

Main Subjects

References

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Cell Journal (Yakhteh)
Volume 25, Issue 6
June 2023
Pages 399-406

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