2026-04-18T00:29:08Zhttps://recercat.cat/oai/request
oai:recercat.cat:2445/1141892025-12-05T01:53:36Zcom_2072_1057col_2072_478917
RECERCAT author Valmaseda, Aida author Bassat Orellana, Quique author Aide, Pedro Carlos Paulino author Cisteró, Pau author Jiménez, Alfons author Casellas, Aina author Machevo, Sonia author Aguilar, Ruth author Sigaúque, Betuel author Chauhan, Virander Singh author Langer, Christine author Beeson, James G. author Chitnis, Chetan E. author Alonso, Pedro author Gaur, Deepak author Mayor Aparicio, Alfredo Gabriel 2017-07-21T12:08:19Z2017-07-21T12:08:19Z20172017-07-19T18:00:12Z Plasmodium falciparum proteins involved in erythrocyte invasion are main targets of acquired immunity and important vaccine candidates. We hypothesized that anti-parasite immunity acquired upon exposure would limit invasion-related gene (IRG) expression and affect the clinical impact of the infection. 11 IRG transcript levels were measured in P. falciparum isolates by RT-PCR, and IgG/IgM against invasion ligands by Luminex(R), in 50 Mozambican adults, 25 children with severe malaria (SM) and 25 with uncomplicated malaria (UM). IRG expression differences among groups and associations between IRG expression and clinical/immunologic parameters were assessed. IRG expression diversity was higher in parasites infecting children than adults (p = 0.022). eba140 and ptramp expression decreased with age (p = 0.003 and 0.007, respectively) whereas p41 expression increased (p = 0.022). pfrh5 reduction in expression was abrupt early in life. Parasite density decreased with increasing pfrh5 expression (p < 0.001) and, only in children, parasite density increased with p41 expression (p = 0.007), and decreased with eba175 (p = 0.013). Antibody responses and IRG expression were not associated. In conclusion, IRG expression is associated with age and parasite density, but not with specific antibody responses in the acute phase of infection. Our results confirm the importance of multi-antigen vaccines development to avoid parasite immune escape when tested in malaria-exposed individuals. cc by (c) Valmaseda, Aida et al., 2017 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Plasmodium falciparum Hematies Plasmodium falciparum Erythrocytes Host age and expression of genes involved in red blood cell invasion in Plasmodium falciparum field isolates info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion