3.2. Topical application of porcine placental extract inhibits the progression of experimental contact hypersensitivity
Since treatment of PE in RAW 264.7 macrophage cell line inhibited its activation and production of TNF-α we further investigated whether PE treatment could reduce the symptoms of contact hypersensitivity (CHS) in in vivo animal model. To apply PE in animal model of CHS, PE-containing ointment was prepared as described in Section 2. CHS was induced by DNCB treatment for 2 weeks and then treatment was initiated as indicated in Fig. 2. Mice were treated daily either with vehicle alone (vacant gel) or PEcontaining gels till the end of experiment (see Section 2 in detail). The effect of PE treatment on CHS progression was compared with the control (vehicle) group. During the treatment period ear thickness was measured as a marker for clinical manifestation of CHS severity. Protective effect of PE treatment against CHS progression began to appear after 1 week (day 21) of PE gel treatment (Fig. 2). Mice treated with PE showed considerably decreased ear thickness and showed no further thickening of the ear compared to the vehicle group that showed continuous increase in ear thickness till the end of experiment (Fig. 2). The clinical symptoms of CHS include redness, edema, inflammation and dryness. Compared to control group, PE treated group showed significantly reduced symptoms of CHS. Chronic inflammation leads to an increase of local lymph node size. To check if the protective effect of PE treatment also affected immune response in local lymph nodes, draining lymph nodes were isolated from each treatment group and their size was compared between the treatment groups. PE group showed much smaller size of draining lymph nodes compared to vehicle group (Fig. 3). Since an increase in serum IgE levels is associated with clinical symptoms of CHS, we tested whether amelioration of CHS by PE treatment is also associated with modulation of serum IgE levels. Indeed, PE group showed significantly lowered serum IgE levels compared to control group (Fig. 4). The healing effect of topical application of PE in CHS was further confirmed by histological examination of the inflamed ear tissue by H&E staining. Compared to the PE group, vehicle group showed intensified inflammation manifested by thickening of the epidermis, fibrosis in the dermis and excessive invasion of inflammatory molecule in the ear tissue (Fig. 5). Collectively these data indicate a beneficial effect of placenta extract in modulation of contact hypersensitivity.
3.2 ใช้สารสกัดจากรกลอกช่วงเฉพาะยับยั้งความก้าวหน้าของการทดลองที่ไวต่อยาติดต่อ Since treatment of PE in RAW 264.7 macrophage cell line inhibited its activation and production of TNF-α we further investigated whether PE treatment could reduce the symptoms of contact hypersensitivity (CHS) in in vivo animal model. To apply PE in animal model of CHS, PE-containing ointment was prepared as described in Section 2. CHS was induced by DNCB treatment for 2 weeks and then treatment was initiated as indicated in Fig. 2. Mice were treated daily either with vehicle alone (vacant gel) or PEcontaining gels till the end of experiment (see Section 2 in detail). The effect of PE treatment on CHS progression was compared with the control (vehicle) group. During the treatment period ear thickness was measured as a marker for clinical manifestation of CHS severity. Protective effect of PE treatment against CHS progression began to appear after 1 week (day 21) of PE gel treatment (Fig. 2). Mice treated with PE showed considerably decreased ear thickness and showed no further thickening of the ear compared to the vehicle group that showed continuous increase in ear thickness till the end of experiment (Fig. 2). The clinical symptoms of CHS include redness, edema, inflammation and dryness. Compared to control group, PE treated group showed significantly reduced symptoms of CHS. Chronic inflammation leads to an increase of local lymph node size. To check if the protective effect of PE treatment also affected immune response in local lymph nodes, draining lymph nodes were isolated from each treatment group and their size was compared between the treatment groups. PE group showed much smaller size of draining lymph nodes compared to vehicle group (Fig. 3). Since an increase in serum IgE levels is associated with clinical symptoms of CHS, we tested whether amelioration of CHS by PE treatment is also associated with modulation of serum IgE levels. Indeed, PE group showed significantly lowered serum IgE levels compared to control group (Fig. 4). The healing effect of topical application of PE in CHS was further confirmed by histological examination of the inflamed ear tissue by H&E staining. Compared to the PE group, vehicle group showed intensified inflammation manifested by thickening of the epidermis, fibrosis in the dermis and excessive invasion of inflammatory molecule in the ear tissue (Fig. 5). Collectively these data indicate a beneficial effect of placenta extract in modulation of contact hypersensitivity.
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