TY - JOUR
T1 - Basophil depletion downregulates Schistosoma mansoni egg-induced granuloma formation
AU - Anyan, William K.
AU - Seki, Takenori
AU - Kumagai, Takashi
AU - Obata-Ninomiya, Kazushige
AU - Furushima-Shimogawara, Rieko
AU - Kwansa-Bentum, Bethel
AU - Akao, Nobuaki
AU - Bosompem, Kwabena M.
AU - Boakye, Daniel A.
AU - Wilson, Michael D.
AU - Karasuyama, Hajime
AU - Ohta, Nobuo
PY - 2013/12
Y1 - 2013/12
N2 - Granuloma formation around parasite eggs during schistosomal infection is considered to be controlled by Th2 cytokines. However, it is still controversial which cell populations are responsible for the host Th2 cytokine-dependent granuloma formation. Basophils have recently attracted attention because of their ability to produce large amounts of IL-4. Therefore, we investigated whether basophils play an essential role in the induction of granuloma formation induced by Schistosoma mansoni eggs. Together with our previous observation that basophil numbers increased markedly in the spleen at 7. weeks postinfection, immunohistochemical staining using anti-mMCP8 monoclonal antibody (mAb) showed basophil infiltration in the granulomatous lesions formed around parasite eggs. To examine the roles of basophils more directly, we treated mice with anti-CD200R3 mAb to deplete basophils. Depletion of basophils resulted in a reduction of basophil number with concomitant downregulation of egg granuloma formation at 7. weeks postinfection. Moreover, we observed a significant reduction in the size of egg granulomas formed in basophil-depleted mice in the pulmonary granuloma model. Taken together, these findings indicated that basophils are essential for S. mansoni egg-induced granuloma formation, and this may serve as a novel therapeutic target in ameliorating the pathology of schistosomiasis.
AB - Granuloma formation around parasite eggs during schistosomal infection is considered to be controlled by Th2 cytokines. However, it is still controversial which cell populations are responsible for the host Th2 cytokine-dependent granuloma formation. Basophils have recently attracted attention because of their ability to produce large amounts of IL-4. Therefore, we investigated whether basophils play an essential role in the induction of granuloma formation induced by Schistosoma mansoni eggs. Together with our previous observation that basophil numbers increased markedly in the spleen at 7. weeks postinfection, immunohistochemical staining using anti-mMCP8 monoclonal antibody (mAb) showed basophil infiltration in the granulomatous lesions formed around parasite eggs. To examine the roles of basophils more directly, we treated mice with anti-CD200R3 mAb to deplete basophils. Depletion of basophils resulted in a reduction of basophil number with concomitant downregulation of egg granuloma formation at 7. weeks postinfection. Moreover, we observed a significant reduction in the size of egg granulomas formed in basophil-depleted mice in the pulmonary granuloma model. Taken together, these findings indicated that basophils are essential for S. mansoni egg-induced granuloma formation, and this may serve as a novel therapeutic target in ameliorating the pathology of schistosomiasis.
KW - Ba103
KW - Basophils
KW - Egg granuloma
KW - Parasite eggs
KW - Schistosoma mansoni
UR - http://www.scopus.com/inward/record.url?scp=84881162288&partnerID=8YFLogxK
U2 - 10.1016/j.parint.2013.07.003
DO - 10.1016/j.parint.2013.07.003
M3 - Article
C2 - 23850838
AN - SCOPUS:84881162288
SN - 1383-5769
VL - 62
SP - 508
EP - 513
JO - Parasitology International
JF - Parasitology International
IS - 6
ER -