Abstract:
:Peritoneal mast cells (PMC) and intestinal mucosal mast cells (IMMC) were purified from rats infected with the nematode Nippostrongylus brasiliensis. Overall protein constituents of both mast cell subtypes were analyzed by two-dimensional gel electrophoresis using either nonequilibrium pH gradient electrophoresis (NEPHGE) or isoelectric focusing (IEF) in the first dimension and SDS-PAGE (10%) in the second dimension followed by silver staining. PMC had seven dominant basic proteins (PB2-8; pI 9-9.5) with estimated molecular masses of 26 to 37 kDa, as well as 80 to 90 neutral or acidic proteins, most of which had pI 6 to 7.5 and estimated molecular masses of 20 to 100 kDa. All the basic proteins were granule-associated. Three basic proteins, PB6 (29 kDa), PB7 (28 kDa) and PB8 (RMCP I, 26 kDa), bound [3H]diisopropyl fluorophosphate (DFP), suggesting that they are serine proteases. However, only PB8 was reactive with antibodies to RMCP I. Another basic component (less than 14 kDa), perhaps a degradation product of PB6, PB7 or PB8, also bound [3H]DFP. By comparison, IMMC possessed nine basic proteins (IB1-9) and, in general, they were more acidic (pI about 8.5-9) than those of PMC. Four major basic proteins (IB6-9) were all 24 kDa but were slightly different in isoelectric points. These and another 46-kDa basic component (IB2) were reactive with antibodies to RMCP II and bound [3H]DFP. There were no other DFP-binding proteins in IMMC. In spite of remarkable differences between basic granule-associated proteins in PMC and basic proteins in IMMC, spots in the neutral-acidic range were for the most part similar in the two mast cell subsets, although quantitative differences were evident for some spots. Thus, rat mast cell populations from the peritoneal cavity and intestinal mucosa exhibit marked heterogeneity in their protein constituents with basic pI, including in their granule-associated proteins with serine protease activity.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Abe T,Swieter M,Imai T,Hollander ND,Befus ADdoi
10.1002/eji.1830200911subject
Has Abstractpub_date
1990-09-01 00:00:00pages
1941-7issue
9eissn
0014-2980issn
1521-4141journal_volume
20pub_type
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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doi:10.1002/eji.1830160118
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pub_type: 杂志文章
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更新日期:2004-09-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
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更新日期:2010-09-01 00:00:00
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doi:10.1002/(SICI)1521-4141(199801)28:01<1::AID-IMMU1>
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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