Abstract:
:The role of genetic factors associated with the immunoglobulin heavy chain locus (Igh) in the development of benign monoclonal gammapathy (BMG), a benign B-cell proliferative disorder, was investigated in six Igh congenic mouse strains during ageing. The strains used had a C57BL or BALB background: C57BL/6, BALB.Igb and CB-20 carrying the C57BL Igh (Ighb allotype), BALB/c and C57BL/6.Iga carrying the BALB/c Igh (Igha allotype) and BAB-14, that is of BALB/c origin with the exception of the constant part of the Igh, which is of C57BL origin. The frequency of homogeneous immunoglobulins (H-Ig), both single and multiple, was the highest in C57BL/6 mice, followed by C57BL/6.Iga. The frequencies of H-Ig in BALB.Igb and CB-20 mice were higher than those of BALB/c and BAB-14, although somewhat lower than in C57BL/6.Iga mice. Multiple H-Ig were found especially in the sera of C57BL/6 mice. Categorization of the monoclonal gammapathies (MG) on the basis of their origin showed a single transient monoclonal B-cell proliferation in 0-8% of the mice of all strains. Persistent, non-progressive MG, presumably BMG, were detected in 64% of C57BL/6, 30% of C57BL/6.Iga, 22% of BALB.Igb, 17% of CB-20, 13% of BAB-14 and 6% of BALB/c mice. Multiple myeloma or Waldenström-like B-cell lymphoma were found to be responsible for 2-4% of the paraproteinemias in all strains. The remaining H-Ig, varying from 11% of the C57BL/6 to 70% of the BAB-14 mice, could not be evaluated in time. The most frequent isotypes of the BMG within C57BL/6 and C57BL/6.Iga were IgG2a and IgG2b, respectively; IgM was the most frequent isotype within the four BALB congenic strains. The immunoglobulin heavy chain allotypes under investigation appeared to be only partly related to the onset, occurrence, multiplicity and persistence of the BMG developing in these Igh congenic C57BL and BALB strains during ageing. The immunoglobulin heavy chain allotypes, however, were not related to the major isotype of the BMG. The results obtained in CB-20 and BALB.Igb on the one hand, and in BAB-14 on the other hand, may suggest a role for the variable part of the Igh in the development of BMG. Since no absolute influence could be ascribed to the Igh, we assume that primarily other genetic sequences regulating proliferative B-cell functions account for the pathogenesis of BMG.
journal_name
Immunologyjournal_title
Immunologyauthors
van den Akker TW,de Glopper-van der Veer E,Radl J,Benner Rsubject
Has Abstractpub_date
1988-09-01 00:00:00pages
31-5issue
1eissn
0019-2805issn
1365-2567journal_volume
65pub_type
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