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Stage-specific and species-specific differences in the production of the mRNA and protein for the filarial nematode secreted product, ES-62

Published online by Cambridge University Press:  19 January 2004

G. STEPEK ,
K. M. HOUSTON ,
H. S. GOODRIDGE ,
E. DEVANEY  and
W. HARNETT
G. STEPEK
Affiliation:
Department of Immunology, University of Strathclyde, Glasgow, G4 ONR
K. M. HOUSTON
Affiliation:
Department of Immunology, University of Strathclyde, Glasgow, G4 ONR
H. S. GOODRIDGE
Affiliation:
Department of Immunology, University of Glasgow, Glasgow G11 6NT
E. DEVANEY
Affiliation:
Department of Veterinary Parasitology, University of Glasgow, Glasgow G61 1GH
W. HARNETT
Affiliation:
Department of Immunology, University of Strathclyde, Glasgow, G4 ONR
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Abstract

Previous studies have shown that the secreted phosphorylcholine-containing glycoprotein of filarial nematodes, ES-62, is only present in the post-infective life-cycle stages, but that the mRNA is transcribed throughout the worm's life-cycle. The aim of this current study was to investigate whether the presence or absence of protein expression simply reflects differences in mRNA abundance. To this end, we investigated the relative abundance of ES-62 using TaqMan real time RT-PCR, in different life-cycle stages of 2 model filarial nematode parasites, Acanthocheilonema viteae and Brugia pahangi. For B. pahangi, microfilariae, infective larvae and adult worms were each found to have approximately similar levels of ES-62 mRNA. However, the corresponding stages of A. viteae differed greatly from each other with a pattern of increased mRNA production with maturation. As a rule A. viteae had higher levels of ES-62 mRNA than B. pahangi, and this was particularly noticeable in the adult stage where the difference was approximately 3500-fold higher. However, this significant difference in mRNA abundance was not reflected in the quantity of ES-62 protein secreted by the adult worms of each species, as A. viteae only secreted ~3 times as much ES-62 as B. pahangi. Thus, overall, the results obtained from this study indicate that ES-62 protein production does not solely reflect mRNA levels, and also suggest that the 2 nematodes may employ different mechanisms for regulating protein production.

Keywords

phosphorylcholine-containing glycoproteinES-62 proteinfilarial nematodesAcanthocheilonema viteaeBrugia pahangi
Type
Research Article
Information
Parasitology , Volume 128 , Issue 1 , January 2004 , pp. 91 - 98
Copyright
2004 Cambridge University Press

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