Research Article

Taenia crassiceps Antigens Control Experimental Type 1 Diabetes by Inducing Alternatively Activated Macrophages

Table 1

Description of experimental groups.

TreatmentDescriptionGroups

STZDiabetic mice were induced with multiple low doses of streptozotocin (MLD-STZ). They received during five days consecutive intraperitoneal injections (i.p) of STZ (Sigma-Aldrich; 45 mg/kg) dissolved in 0.1 M sodium citrate, pH 4.5 [30]STZ

STZ/TcSMice with MLD-STZ and injections of T. crassiceps soluble antigens
With 50 μg of TcS i.p. 3 times for a week, one week before, and during the week of induction with MLD-STZSTZ/TcS-1
Treated constantly with 50 μg i.p. 3 times per week, one week before, during treatment with MLD-STZ, and for 6 weeks post induction until euthanasiaSTZ/TcS-2
Treated with 50 μg i.p. 3 times per week, starting 1 week post induction of T1D and continuing until sacrificeSTZ/TcS-3
Treated with 100 μg i.p. 3 times per week during 1 week post induction of T1D and for 6 weeks afterwardSTZ/TcS-4
Treated with 200 μg i.p. 3 times per week, starting 1 week post induction T1D and continuing for 6 weeksSTZ/TcS-5

STZ/TcESAnimals treated with injections of T. crassiceps excreted/secreted antigens with MLD-STZ
Treated with 50 μg i.p. 3 times per week, one week before, during treatment with MLD-STZ, and for 6 weeks post inductionSTZ/TcES-1
Treated with 50 μg i.p. 3 times per week started 1 week post induction of T1D for the rest of the treatment periodSTZ/TcES-2
Treated with 100 μg i.p. 3 times per week since first week post induction of T1D for the rest of the treatment periodSTZ/TcES-3
Treated with 200 μg i.p. 3 times per week, started one week after induction of T1D and during 6 weeksSTZ/TcES-4

LiposomesSix- to eight-week-old mice were infected i.p. with 20 cysticerci, and then we waited 6 weeks post infection to induce diabetes by MLD-STZ. We chose this time period to induce diabetes because we know by a previous report from our group that the change in the immune response to a Th2 response and the appearance of AAMϕs have been established to occur in the sixth to eighth week post infection [31]. Macrophages were depleted in vivo using dichloromethylene diphosphonate (clodronate) encapsulated in liposomes. Treatment of liposome injections was followed as Reyes et al. [31]
In the second week after T1D-induction, mice were treated with i.p. injections of clodronate liposomes (Cl) or PBS liposomes (200 μl/mouse i.p. 3 times/week) for 5 weeks post T1D inductionSTZ Cl
STZ PBS
Two weeks after T1D induction by MLD-STZ, T. crassiceps-infected and T. crassiceps-uninfected mice were injected i.p. with Cl liposomes and PBS liposomes (200 μl/mouse i.p. 3 times/week) for 5 weeks post T1D inductionSTZ/Tc Cl
STZ/Tc PBS
An equivalent treatment with clodronate liposomes was done in TcSA-treated Balb/c mice. Animals were injected on a similar schedule to STZ/TcS-2, the second week before T1D induction and continuing for 4 weeks post induction. Blood glucose levels were measured for 4 weeksSTZ/TcS Cl
STZ/TcS PBS

UntreatedReceiving neither antigens nor MLD-STZUntreated