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- W1998285776 abstract "We have previously shown that dose–response studies performed in streptozotocin (STZ)-diabetic nude mouse recipients bearing established, functioning islet xenografts can be used to directly compare in vivo STZ-sensitivity between donor species and that tilapia (fish) islet grafts are exceedingly STZ-resistant. Using this method, we tested whether tilapia islets are sensitive to alloxan. Tilapia or rat islets were transplanted under the renal capsules of STZ-diabetic nude mice. Recipients with normal glucose tolerance tests (GTTs) on day 30–35 were injected with increasing i.v. doses of alloxan and blood glucose levels were followed for 5–7 days and then GTTs were repeated. Next, mice were killed and their grafts/native pancreata examined histologically (including insulin stains). Control nude mice were also injected with increasing i.v. doses of alloxan. Based upon non-fasting blood glucose levels, GTT, and graft histology, the following observations were made: (1) Tilapia islet xenografts were uniformly resistant to i.v. doses of 75 mg/kg (n=3), 150 mg/kg (n=4), and 300 mg/kg (n=3). (2) Rat islet recipients became uniformly severely diabetic after alloxan i.v. doses of 50–70 mg/kg (n=6) (i.e., equivalent to the dosage needed to induce diabetes in rats). (3) Control nude mice were severely diabetic at doses of 75 mg/kg (4/5) and 150 mg/kg (n=3/3). Alloxan dose–response studies were also performed in tilapia. Interestingly, tilapia appeared more sensitive than tilapia islet grafts. Although 75 mg/kg i.v. had little effect in tilapia, higher doses caused severe β cell necrosis, diabetes, and systemic damage; however, this seeming discrepancy can be explained as tilapia have about one-quarter of the blood volume of mice (i.e., as a percentage of body weight) and so the actual concentration in the blood was about 4-fold higher at each dose. We conclude that tilapia β cells are highly resistant to the β cell toxin alloxan." @default.
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- W1998285776 date "2004-06-01" @default.
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- W1998285776 title "Tilapia islet grafts are highly alloxan-resistant" @default.
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- W1998285776 doi "https://doi.org/10.1016/j.ygcen.2004.02.017" @default.
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