Journal
PARASITOLOGY RESEARCH
Volume 101, Issue 6, Pages 1589-1595Publisher
SPRINGER
DOI: 10.1007/s00436-007-0679-4
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The protein disulfide isomerase (PDI) is a ubiquitous protein, which contributes in building disulfide bridges. In the work presented here, the expression of the PDI in different stages of the canine hookworm Ancylostoma caninum was investigated. Third-stage larvae (L3), adults, as well as serum-stimulated and hypobiotic L3 were used. For quantification of the PDI gene transcription, a real-time PCR was used establishing a hybridization probe (TaqMan (TM) probes) for detection of PDI copy numbers in different populations. 18S ribosomal ribonucleic acid (rRNA) was used as a housekeeping gene for normalization. The results show differences in the transcription level of the investigated A. caninum populations: The serum-stimulated larvae representing the switch to parasitism showed the highest PDI expression. The hypobiotic larvae representing a resting stage showed the lowest expression level. Male adults showed an elevated expression compared to female adult worms. The L3 expression level was just below the serum-stimulated population. This work confirms the upregulated gene expression of PDI during host penetration and invasion.
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