Human T cell recognition of the blood stage antigen Plasmodium hypoxanthine guanine xanthine phosphoribosyl transferase (HGXPRT) in acute malaria

<p>Abstract</p> <p>Background</p> <p>The <it>Plasmodium </it>purine salvage enzyme, hypoxanthine guanine xanthine phosphoribosyl transferase (HGXPRT) can protect mice against <it>Plasmodium yoelii </it>pRBC challenge in a T cell-dependent manner and has, therefore, been proposed as a novel vaccine candidate. It is not known whether natural exposure to <it>Plasmodium falciparum </it>stimulates HGXPRT T cell reactivity in humans.</p> <p>Methods</p> <p>PBMC and plasma collected from malaria-exposed Indonesians during infection and 7–28 days after anti-malarial therapy, were assessed for HGXPRT recognition using CFSE proliferation, IFNγ ELISPOT assay and ELISA.</p> <p>Results</p> <p>HGXPRT-specific T cell proliferation was found in 44% of patients during acute infection; in 80% of responders both CD4⁺and CD8⁺T cell subsets proliferated. Antigen-specific T cell proliferation was largely lost within 28 days of parasite clearance. HGXPRT-specific IFN-γ production was more frequent 28 days after treatment than during acute infection. HGXPRT-specific plasma IgG was undetectable even in individuals exposed to malaria for at least two years.</p> <p>Conclusion</p> <p>The prevalence of acute proliferative and convalescent IFNγ responses to HGXPRT demonstrates cellular immunogenicity in humans. Further studies to determine minimal HGXPRT epitopes, the specificity of responses for Plasmodia and associations with protection are required. Frequent and robust T cell proliferation, high sequence conservation among <it>Plasmodium </it>species and absent IgG responses distinguish HGXPRT from other malaria antigens.</p

Treatment of Dyspareunia by Creation of a Pseudojoint in Rigid Bone Following Total Penile Reconstruction with Fibular Osteocutaneous Flap

Gender reassignment requires total penile reconstruction, which is commonly performed with autologous tissue. One option for reconstruction is the free fibula osteocutaneous flap, which provides a long segment of vascularized bone that is less susceptible to infection and allows for deep penetration into the vagina during sexual intercourse. One problem, however, is that their sexual partner may suffer from pain (dyspareunia) because of the long and rigid bone. Our intent is to elucidate the treatment of female dyspareunia by surgically modifying the reconstructed penis with segmental osteotomies and fascia interposition within the rigid bone stock resulting from gender reassignment with a free fibula osteocutaneous flap. In order to improve their sexual relations and alleviate dyspareunia, a semirigid penis was created by forming a pseudojoint at the junction of the proximal and distal third of the fibula bone stock with osteotomies and fascia interposition. Alleviation of dyspareunia by surgical modification of a previously reconstructed penis for the couple to continue to have sexual relations. The created pseudojoints in the reconstructed penis allowed for pain‐free vaginal intercourse between the patient and his wife because of its now semirigid structure. The surgical modification presented in this case report addresses the treatment of dyspareunia by creating a more malleable penile reconstruction, which will now allow for a pain‐free vaginal intercourse. Salgado C, Rampazzo A, Xu E, and Chen H‐C. Treatment of dyspareunia by creation of a pseudojoint in rigid bone following total penile reconstruction with fibular osteocutaneous flap. J Sex Med **; **:**–**