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. 1994 Jul;97(1):152–157. doi: 10.1111/j.1365-2249.1994.tb06594.x

Binding of pentraxins to different nuclear structures: C-reactive protein binds to small nuclear ribonucleoprotein particles, serum amyloid P component binds to chromatin and nucleoli.

M B Pepys 1, S E Booth 1, G A Tennent 1, P J Butler 1, D G Williams 1
PMCID: PMC1534802  PMID: 8033412

Abstract

Binding of the human pentraxin plasma proteins, C-reactive protein (CRP) and serum amyloid P component (SAP), to the nuclei of human cells was studied using whole acute phase serum as the source of the proteins and confocal immunofluorescence microscopy. CRP and SAP clearly bound to distinct, different structures. Double staining with MoAbs to the Sm D and Sm B/B' components of small nuclear ribonucleoproteins confirmed that CRP bound exclusively to these particles. As expected, SAP bound to chromatin and, in addition, binding to the nucleolus was observed for the first time. These interactions demonstrated under relatively physiological conditions, with native pentraxins unseparated from serum and with nuclear constituents in situ, are likely to be of functional importance in vivo.

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