LS14 cells: a model for chemoresistance in liposarcoma

Area of Science:

• Oncology
• Cancer Biology
• Pharmacology

Background:

• Liposarcoma, a common soft tissue sarcoma, presents a poor prognosis for unresectable or metastatic cases due to inherent chemoresistance.
• A novel, spontaneously immortalized metastatic liposarcoma cell line, LS14, was established for research purposes.

Purpose of the Study:

• To compare the chemosensitivity of LS14 and SW872 liposarcoma cell lines to standard anti-cancer drugs.
• To investigate the underlying mechanisms of chemoresistance in liposarcoma.

Main Methods:

• Cell viability and number assays were employed to assess drug responses.
• Apoptosis was evaluated using phosphatidylserine exposure and caspase 3 cleavage assays.
• Expression levels of apoptosis-related proteins (Bcl-2, Bcl-xL, survivin, Bax) were analyzed.

Main Results:

• SW872 cells demonstrated robust sensitivity to doxorubicin, cisplatin, and vinblastine, inducing apoptosis.
• LS14 cells exhibited significant resistance, requiring high drug doses or combination therapy for apoptosis induction.
• LS14 cells displayed elevated anti-apoptotic protein (Bcl-2, Bcl-xL) expression and reduced pro-apoptotic protein (survivin, Bax) expression compared to SW872 cells.
• LS14 cells confirmed tumorigenicity and metastatic potential in SCID mice.

Conclusions:

• LS14 cells represent a highly chemoresistant liposarcoma model, distinct from the more sensitive SW872 cell line.
• Differential expression of apoptosis regulatory proteins contributes to chemoresistance in LS14 cells.
• LS14 cells provide a valuable in vitro and in vivo platform for developing and testing new liposarcoma therapies.