Background: Plasmodium, the causative agent of malaria, exports many proteins to the surface of the infected red blood cell (iRBC) in order to modify it toward a structure more suitable for parasite development and survival. One such exported protein, SURFIN_4.2, from the parasite of human malignant malaria, P. falciparum, was identified in the trypsin-cleaved protein fraction from the iRBC surface, and is thereby inferred to be exposed on the iRBC surface. SURFIN_4.2 also localize to Maurer’s clefts—parasite-derived membranous structures established in the RBC cytoplasm and tethered to the RBC membrane—and their role in trafficking suggests that they are a pathway for SURFIN_4.2 transport to the iRBC surface. It has not been determined the participation of protein domains and motifs within SURFIN_4.2 in transport from Maurer’s clefts to the iRBC surface; and herein we examined if the SURFIN_4.2 intracellular region containing tryptophan-rich (WR) domain is required for its exposure on the iRBC surface. Results: We generated two transgenic parasite lines which express modified SURFIN_4.2, with or without a part of the intracellular region. Both recombinant SURFIN_4.2 proteins were exported to Maurer’s clefts. However, only SURFIN_4.2 possessing the intracellular region was efficiently cleaved by surface treatment of iRBC with proteinase K. Conclusions: These results indicate that SURFIN_4.2 is exposed on the iRBC surface and that the intracellular region containing WR domain plays a role on the transport from Maurer’s clefts to the iRBC membrane.

Background: Plasmodium, the causative agent of malaria, exports many proteinsto the surface of the infected red blood cell (iRBC) in order to modify ittoward a structure more suitable for parasite development and survival. Onesuch exported protein, SURFIN_4.2, from the parasite of humanmalignant malaria, P. falciparum, wasidentified in the trypsin-cleaved protein fraction from the iRBC surface, andis thereby inferred to be exposed on the iRBC surface. SURFIN_4.2 alsolocalize to Maurer’s clefts – parasite-derived membranous structures establishedin the RBC cytoplasm and tethered to the RBC membrane – and their role intrafficking suggests that they are a pathway for SURFIN_4.2 transportto the iRBC surface. It has not been determined the participation of proteindomains and motifs within SURFIN_4.2 in transport from Maurer’sclefts to the iRBC surface; and herein we examined if the SURFIN_4.2 intracellularregion containing tryptophan-rich (WR) domain is required for its exposure on theiRBC surface. Results: We generated two transgenic parasite lineswhich express modified SURFIN_4.2, with or without a part of the intracellularregion. Both recombinant SURFIN_4.2 proteins were exported to Maurer’sclefts. However, only SURFIN_4.2 possessing the intracellular region wasefficiently cleaved by surface treatment of iRBC with proteinase K. Conclusions: These results indicate that SURFIN_4.2is exposed on the iRBC surface and that the intracellular region containing WRdomain plays arole on the transport from Maurer’s clefts to the iRBC membrane.

Irritable bowel syndrome (IBS), one of the most common gastrointestinal disorders, and is common in childhood. It is characterized by abdominal pain or discomfort with no organic or metabolic etiology. The abdominal pain and discomfort are associated with changes in defecation or stool form. We report a pediatric patient with IBS, who was successfully treated with acupuncture and moxibustion.
The patient was a 10-year-old girl, who had developed IBS 3 years previously. She had abdominal pain accompanied by bowel movements with soft stool five times per day. The patient was treated with acupuncture and moxibustion according to the theories of traditional Chinese medicine. In addition, we used the Gastrointestinal Symptoms Rating Scale (GSRS) to evaluate her quality of life. She received acupuncture and moxibustion treatment at two sessions/week during the first 6 weeks, followed by only one session/week later. One month after the treatment was started, her GSRS score began to improve and her abdominal pain and bowel movements were reduced. Compared with baseline, her GSRS score was improved at 2 months and 1 year after the acupuncture was started. In conclusion, acupuncture and moxibustion treatment was effective in the present pediatric IBS patient.