Parasitology Research

, Volume 101, Issue 2, pp 325–330 | Cite as

Transferrin in the mosquito, Culex quinquefasciatus Say (Diptera: Culicidae), up-regulated upon infection and development of the filarial parasite, Wuchereria bancrofti (Cobbold) (Spirurida: Onchocercidae)

  • K. P. PailyEmail author
  • B. Agiesh Kumar
  • K. Balaraman
Original Paper


Transferrin is a defence protein known to be up-regulated upon infection of parasites/pathogens in Aedes aegypti mosquito. However, no information is available on its up-regulation in Culex quinquefasciatus, the vector of bancroftian filarial parasite. In the present study, enhancement of transferrin in C. quinquefasciatus infected with Wuchereria bancrofti is demonstrated through amplification of the specific mosquito transcript, its sequencing, cloning, and expression. By using two oligonucleotide primers, a 950-bp polymerase chain reaction product was obtained from the first strand cDNA made from RNA of C. quinquefasciatus infected with W. bancrofti. A 707-bp sequence encoding the mature portion of transferrin was confirmed by sequencing the product. This is the first report of transferrin expression in C. quinquefasciatus. The deduced amino acid sequence shared 85% homology with A. aegypti transferrin precursor molecule. Western blot analysis of haemolymph proteins of infected C. quinquefasciatus with antibodies raised against recombinant transferrin protein showed binding to a 66-kDa protein, confirming its identity as transferrin. Hence, this molecule also could be added to the list of immune molecules of C. pipiens group, such as the defensin, gambicin, and cecropin, which are already known.


Transferrin Filarial Parasite Guanidine Thiocyanate Immune Molecule Bancroftian Filariasis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We thank Dr. P. K. Das, Director, Vector Control Research Centre, Pondicherry, for his encouragement and Mr. A. Ramamoorthy, Technician, for his technical help. This work was done under the financial support of a project grant of Indian Council of Medical Research.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Vector Control Research Centre (Indian Council of Medical Research)PondicherryIndia

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