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Athymic nu nu

Manufactured by Taconic Biosciences

The Athymic nu/nu is a laboratory mouse model that lacks a functional thymus gland, resulting in a deficiency of T cells. This model is commonly used in research to study the effects of immune system dysfunction and to evaluate the efficacy of therapies targeting the immune system.

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5 protocols using athymic nu nu

1

Honokiol and Radiation Therapy for Nude Mouse Xenograft

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The animal experiment was approved by the Institutional Animal Care and Use Committee of Emory University. Tu686 cells (1.5×106) were injected subcutaneously into 4–5 week-old female nude mice (athymic nu/nu, Taconic NY). When the tumors had developed to about 100mm3, the mice were divided into four groups (n=6 per group) and treated as follows:1) control treated with 20% intralipid (Baxter Healthcare), 2) honokiol (50mg/kg), 3) RT (1.5Gy every other day for 5 treatments), 4) honokiol (50mg/kg) plus RT (1.5Gy, every other day for 5 treatments). Honokiol was administered 3 times per week via intraperitoneal injection. For RT, mice were irradiated with 1.5Gy every other day for 5 treatments. The therapy was continued for 4 weeks. The body weight and tumor size were measured and calculated three times per week (29 (link)). The mice were sacrificed 4 weeks after the initiation of treatment. Tumor and organ tissues (liver, heart, lung, spleen, and kidney) were collected for H&E staining and immunostaining analyses.
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2

In Vivo Tumor Growth Evaluation

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Male athymic nu/nu, Balb/C, and DBA/2 mice, 5–6 weeks of age, were purchased from Taconic and handled in accordance with approved Institutional Animal Care and Use Committee protocols. Following acclimation, mice were inoculated with A549/HAS3, AsPC-1, AsPC-1/HAS3, BxPC-3, BxPC-3/HAS3, H2170/HAS3, WT-CLS1/HAS3 (5 × 106, athymic nu/nu), or CT26/HAS3 cells (2 × 105, Balb/C) adjacent to the right tibia periosteum. KLN205 cells were inoculated s.c. into the right flank of DBA/2 mice (31 (link), 33 (link)). Tumor growth in peritibial models was determined by acquiring three-dimensional (3D) tumor images twice weekly using a high-resolution ultrasound imaging system (Vevo 2100; FUJIFILM VisualSonics), and subsequently the associated 3D tumor volume software was used to determine tumor volume. Subcutaneous tumors were measured using an electronic caliper (Vernier Software & Technology) and tumor volume in mm3 calculated using the formula: Tumor volume = 1/2[length × (width)2].
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3

Evaluating Anti-Tumor Efficacy of Cetuximab and MM-121 in Xenograft Model

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The animal experimental protocol was approved by the Institutional Animal Care and Use Committees of Emory University. In brief, 4×106 Tu212 and 2×106 SCC47 cells (1:1 in matrigel) were injected subcutaneously into female nude mice (athymic nu/nu, Taconic, NY) aged 4 to 6 weeks. Mice were randomly divided into 6 groups after tumor formation: PBS control, cetuximab 6.25μg/dose, MM-121 300μg/dose (MM-121.LD), MM-121 600μg/dose (MM-121.HD), combination with low dose MM-121 (comb. LD) and combination with high dose MM-121 (comb. HD) (n=7 for each treatment group). Doses were chosen based on previous studies (19 (link), 25 (link)). Drugs were given by intraperitoneal injection (I.P.) twice a week. Tumor volume and bodyweight were measured three times a week. Tumor volume was calculated using the formula: V= π/6×larger diameter ×(smaller diameter)2 as reported previously (25 (link)). Major organs were harvested for toxicity evaluation by hematoxylin and eosin (H&E) staining.
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4

Subcutaneous Xenograft Tumor Model

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The animal experimental protocol was approved by the Institutional Animal Care and Use Committees of Emory University. In brief, 2×106 UMSCC1-C1 cells were injected subcutaneously into nude mice (athymic nu/nu, Taconic, NY) aged 4 to 6 weeks. Mice were randomly divided into 5 groups after tumor formation: PBS control, cetuximab 100µg/dose, MM-121 300µg/dose (MM-121.LD), and combination with low dose MM-121 (comb. LD) and combination with high dose MM-121 600µg/dose (comb. HD) (n=7 for each treatment group). Doses were chosen based on previous studies (24 (link), 27 (link)). Drugs were given by intraperitoneal injection (I.P.) twice a week. Tumor volume and bodyweight were measured three times a week. Tumor volume was calculated using the formula: V= π/6×larger diameter × (smaller diameter)2 as reported previously (28 (link)).
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5

Combinational Therapy for Tumor Suppression

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The animal experiment was approved by the Institutional Animal Care and Use Committee of Emory University. KB-8-5 cells (5×105) were injected s.c. into 4–5 week-old female nude mice (Athymic nu/nu, Taconic NY). When the tumors had developed to about 100 mm3, the mice were divided into four groups (n = 7 or 8) in a way to minimize weight and tumor size differences among the groups: control group treated with 20% intralipid (Baxter Healthcare), honokiol group (1.0 mg/mouse or 50 mg/kg), paclitaxel group (20 mg/kg), and honokiol (1.0 mg/mouse or 50 mg/kg) plus paclitaxel (20 mg/kg) combination group. Honokiol was dissolved in 100% ethanol and mixed with 20% intralipid in a 1∶14 (v/v) ratio. Honokiol was administered to the mice 3 times per week at 1.0 mg/mouse (or 50 mg/kg) via intraperitoneal injection. Paclitaxel was administered to the mice once per week at 20 mg/kg through tail vein injection. The therapy was continued for 4 weeks. The body weight and tumor size were measured three times per week. The tumor volume was calculated using the formula: V = //6 × larger diameter × (smaller diameter) [13] (link). The mice were sacrificed 4 weeks after the initiation of treatment. Tumor and organ tissues (liver, heart, lung, spleen, and kidney) were collected for H&E staining and immunostaining analyses.
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