ONCOLYTIC ACTIVITY OF HUMAN ORTHOPNEUMOVIRUS IN CANCER CELL LINES

Area of Science:

• Oncolytic Virotherapy
• Cancer Biology
• Virology

Background:

• Oncolytic virotherapy utilizes viruses to selectively target and destroy cancer cells.
• Previous studies on the oncolytic activity of human orthopneumovirus (hOPV) have yielded conflicting results.
• Cancer cell lines, including HEp-2, A549, and MCF-7, were used to investigate hOPV's effects.

Purpose of the Study:

• To elucidate the role of hOPV in modulating cancer cell growth and apoptosis.
• To evaluate the potential of hOPV as an oncolytic agent against specific cancer types.

Main Methods:

• In vitro assessment of hOPV's oncolytic activity on HEp-2, A549, and MCF-7 cell lines.
• Quantification of virus titers using TCID50/mL.
• Assessment of cell viability and cytotoxicity via MTT and trypan blue assays.
• Detection of hOPV presence using RT-PCR and indirect immunofluorescence.
• Analysis of apoptosis-related gene expression (CASP-3, -8, -9, Bax, Bcl-2, Bcl-XL, TP53, P21) via RT-PCR.

Main Results:

• hOPV significantly inhibited the growth of HEp-2, A549, and MCF-7 cells in a dose- and time-dependent manner.
• At a multiplicity of infection (MOI) of 5, hOPV reduced cancer cell viability, with A549 cells showing the most significant reduction (16%).
• hOPV infection upregulated pro-apoptotic genes (CASP-3, -8, -9, Bax, TP53, P21) and downregulated anti-apoptotic genes (Bcl-2, Bcl-xL).
• A549 cells exhibited a significantly higher induction of apoptosis-related gene expression compared to HEp-2 and MCF-7 cells upon hOPV infection.

Conclusions:

• hOPV demonstrates significant oncolytic activity against tested cancer cell lines.
• The virus effectively modulates apoptosis-related gene expression, favoring cell death.
• hOPV presents a promising candidate for the development of novel oncolytic virotherapies.