Cell origin of pyothorax-associated lymphoma: a lymphoma strongly associated with Epstein-Barr virus infection.
Pyothorax-associated lymphoma (PAL) is an Epstein-Barr virus (EBV)-associated B cell lymphoma developing in the pleural cavity affected by chronic pyothorax. To clarify the cell origin of PAL, the expression of immunoglobulin heavy (IgH) and light chains in relation to somatic hypermutations (SHMs) of rearranged Ig heavy- and light-chain variable (IgV(H), IgV(L)) genes was examined using cell lines as well as clinical samples. SHMs without ongoing mutations of the IgV(H) gene were found in all PAL cell lines and clinical samples available for sequencing, indicating PAL to be derived from B cells at the postgerminal center (GC) stage of the differentiation process. They could be subdivided into post-GC cells with potentially productive IgV(H) genotypes (Group 1) and with sterile IgV(H) genotypes (Group 2). IgH expression was abrogated in Group 2 as expected and also in two cell lines in Group 1. DNA demethylation experiments with 5-aza-dC induced expression of IgH mRNA and protein in these cell lines. Most PAL cells were derived from crippled post-GC cells, which usually could not survive. Transformation of such B cells through EBV infection might provide a basis for the development of PAL with additional genetic changes.
Takakuwa
T
T
Department of Pathology, Osaka University Graduate School of Medicine, Osaka, Japan. takakuwa@molpath.med.osaka-u.ac.jp
Tresnasari
K
K
Rahadiani
N
N
Miwa
H
H
Daibata
M
M
Aozasa
K
K
D000368:Aged; D000595:Amino Acid Sequence; D016175:B-Lymphocyte Subsets / Q000473:pathology* / Q000821:virology; D045744:Cell Line, Tumor; D019070:Cell Lineage; D002472:Cell Transformation, Viral; D016724:Empyema, Pleural / Q000150:complications*; D020031:Epstein-Barr Virus Infections / Q000473:pathology*; D005260:Female; D015322:Gene Rearrangement, B-Lymphocyte; D005803:Genes, Immunoglobulin; D004854:Herpesvirus 4, Human / Q000472:pathogenicity; D006801:Humans; D016403:Lymphoma, Large B-Cell, Diffuse / Q000473:pathology* / Q000821:virology; D038041:Lymphopoiesis; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000235:genetics; D010997:Pleural Neoplasms / Q000473:pathology* / Q000821:virology; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D027041:Somatic Hypermutation, Immunoglobulin; D015533:Transcriptional Activation
D009363:Neoplasm Proteins