L-138 Cells

The L-138 cell line, also known by its original designation M138, is a melanoma cell line derived from cutaneous melanoma. Melanoma is a type of skin cancer originating from melanocytes, the cells responsible for producing melanin. This cell line has been crucial in understanding the surface antigens involved in melanoma and melanocyte differentiation. The L-138 cells are characterized by their expression of specific antigens that define subsets of melanoma, contributing to the classification and differentiation studies of melanoma types based on antigenic profiles.

L-138 cells exhibit unique surface antigens, including the M-24 antigen, identified through monoclonal antibodies. These antigens have been analyzed serologically, revealing that the L-138 cell line expresses antigens detectable by several monoclonal antibodies specific to melanoma. These include the HLA-A,B,C antigens and β2-microglobulin, which are highly reactive in most melanoma cell lines, providing insights into the immune recognition and classification of melanoma cells​:citation[oaicite:0]{index=0}​ .

Moreover, the L-138 cell line has been utilized in tyrosinase activity assays, an enzyme crucial for melanin synthesis. The tyrosinase activity in L-138 cells was measured using radiolabeled tyrosine, demonstrating the functional properties of melanoma cells in pigment production. This activity is compared against non-pigmented renal cancer cells, showcasing the distinct enzymatic activity in melanoma. Such studies help elucidate the metabolic pathways and potential therapeutic targets in melanoma treatment .