Abstract
We conducted a series of experiments to define Ir gene regulation of the immune response to Plasmodium berghei sporozoites and circumsporozoite (CS) protein-derived subunit vaccines. The studies demonstrated that there is no apparent genetic restriction of the capacity to develop protective immunity against a large sporozoite challenge after immunization with irradiation-attenuated P. berghei sporozoites; that the Th response to (Asp-Pro-Ala-Pro-Pro-Asn-Ala-Asn)n, the predominant protective B epitope on the P. berghei CS protein, is genetically restricted and regulated by Class II genes (I-Ab) and by genes in the Class I region (H-2Dk) or telomeric to this region; and that this restriction can be overcome by immunization with a r protein including the entire P. berghei CS protein. The results support the development of full length human CS protein vaccines to take advantage of all potential T epitopes on this protein.
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