Does the major histocompatibility complex serve as a specific receptor for Semliki Forest virus?

Area of Science:

• Virology
• Immunology
• Cell Biology

Background:

• Murine teratoma cell lines F9 and PCC4 lack H-2 major transplantation antigens.
• These cells are susceptible to various viral infections, similar to H-2 expressing cells.
• Murine cytomegalovirus shows differential infectivity between H-2 negative and positive cells.

Purpose of the Study:

• To investigate the role of H-2 major histocompatibility complex antigens in Semliki Forest virus (SFV) infection.
• To determine if H-2 antigens act as specific receptors for SFV entry and replication.

Main Methods:

• Infection assays using various viruses on H-2 negative (F9, PCC4, Daudi) and H-2 positive (F12, fibroblasts) murine cells.
• Analysis of viral replication, mRNA expression, and antigenic expression.
• Use of SFV in H-2 negative lymphoblastoid cells and Daudi cells lacking HLA antigens.

Main Results:

• SFV replicates efficiently in H-2 negative teratoma and lymphoblastoid cells.
• Viral replication and antigenic expression kinetics are similar in H-2 positive and negative cells.
• Daudi cells lacking HLA antigens exhibit impaired SFV replication post-receptor binding, suggesting a potential membrane defect.

Conclusions:

• H-2 major histocompatibility complex antigens are not necessary for SFV infection.
• These MHC antigens do not function as specific receptors for SFV.
• Cellular factors beyond MHC antigens influence SFV replication, as seen in Daudi cells.