Abstract:
:Leishmania major, the causative agent of zoonotic cutaneous leishmaniasis shows heterogeneity and diverse clinical manifestations in different areas of infection and experimental models. Such polymorphism may cause difficulties in selection of reliable strains for development of prophylaxes. Hence, the aim of this study was to identify an ideal strain of L. major, capable of inducing protective and long-lasting Th1 responses in an animal model that mimics the human response to L. major infection. The isolates were from patients residing in 4 endemic areas of L. major in Iran, namely Damghan (north), Kashan (center), Dehloran (west) and Shiraz (south) which their heterogeneity had been previously confirmed in BALB/c mice. In this study, the same isolates as well as the Iranian reference strain of L. major were inoculated to C57BL/6 mice to evaluate their pathogenicity and changes in expression of key cytokine genes from lymph nodes of the mice in different time points, in order to evaluate their ability to control leishmaniasis by development of Th1 responses. Our results showed the lowest and highest parasite burden in lymph nodes of mice infected with all strains at weeks 3 and 8 post-infection, respectively. However, the Damghan strain (DA39) showed comparatively lower number of viable parasite than other strains at week 8 post-infection. Furthermore, DA39 showed higher expression of Ifng and Il12 mRNA at week 8 post-infection while the ratio of its Ifng/Il4 mRNA expressions was higher than other strains. In conclusion, DA39 among the studied strains appears to induce strong and lasting Th1 cytokine gene expressions with minimum virulence, making it a suitable candidate strain for vaccine studies in leishmaniasis.
journal_name
Cytokinejournal_title
Cytokineauthors
Darabi S,Khaze V,Riazi-Rad F,Darabi H,Bahrami F,Ajdary S,Alimohammadian MHdoi
10.1016/j.cyto.2015.05.022subject
Has Abstractpub_date
2015-12-01 00:00:00pages
303-308issue
2eissn
1043-4666issn
1096-0023pii
S1043-4666(15)00208-2journal_volume
76pub_type
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