Linked Life Data

8249114

Source:http://linkedlifedata.com/resource/pubmed/id/8249114

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1993-12-30
pubmed:abstractText
We performed an in vivo and in vitro dose-response study of the novel immunosuppressive macrolide antibiotic rapamycin looking at murine islet allograft survival, impact on glucose homeostasis, and possible tissue toxicity. A total of 300 islets were isolated from CBA/J mice (H-2k) and transplanted beneath the renal capsule of streptozotocin-induced diabetic BALB/c (H-2d) recipients. Seven groups of allografted mice received intraperitoneally for 7 days post-transplant: no immunosuppression (n = 8); vehicle only (carboxymethyl-cellulose) (n = 6); or rapamycin at dosages of 0.05 (n = 8), 0.1 (n = 8), 0.3 (n = 8), 1.0 (n = 8), or 5.0 (n = 6) mg/kg/day. Blood glucose was monitored on alternate days, with graft failure defined by the first day of persistently high blood glucose (> 14 mmol/L). The 0.1 and 0.3 mg/kg/day groups showed statistically significant prolongation of diet allograft survival (P < 0.01) when compared to the controls and vehicle-treated mice. Three mice in both the 0.1 and 0.3 mg/kg/day groups and one mouse in the 0.05 mg group reached 100 days normoglycemia and, following nephrectomy of the islet-bearing kidney, returned to hyperglycemia. The 0.05, 1.0, and 5.0 mg/kg/day groups showed no statistically significant prolongation of graft survival. In addition, the higher dosage (1.0 and 5.0 mg/kg/day) groups had erratic blood glucose control. Histologically, there was no evidence of toxicity seen in any of the multiple organ samples. In the in vitro analysis, BALB/c (H-2k) islets cultured in either 0, 10, 30, or 100 ng/ml rapamycin had no significant differences in insulin secretion following a 24-hr culture period; however, there was a significant deterioration in glucose stimulated insulin release after 72 hr culture at high rapamycin concentration (100 ng/ml). Rapamycin significantly prolonged murine islet allograft survival. At doses 10 to 50 times the effective antirejection dosage, we demonstrated adverse impact on glucose homeostasis without histological evidence of end-organ toxicity. We also demonstrated an adverse impact on insulin release in vitro following prolonged culture (72 hr) in a high concentration of rapamycin.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0041-1337
pubmed:author
pubmed:issnType
Print
pubmed:volume
56
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1137-42
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
The efficacy and toxicity of rapamycin in murine islet transplantation. In vitro and in vivo studies.
pubmed:affiliation
Department of Pediatrics, University of Alberta, Edmonton, Canada.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't