Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P00750 (PLA)
 16,800 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Thin flexible sheets composed of poly(lactic acid) (PLA) laminated polyanhydride, poly(erucic acid dimer-sebacic anhydride) (P(EAD-SA)), loaded with heparin were evaluated in vitro and in vivo. PLA was used for coating the polyanhydride to improve the release profile and improve the strength of the films. Heparin was released constantly for 20 days from PLA-coated 2% loaded P(EAD-SA). The uncoated film of P(EAD-SA) released heparin for only 4 days. The localized delivery of heparin around the carotid artery was investigated by implanting polymer loaded with [3H]heparin around the carotid artery of rats and the heparin release and tissue distribution was monitored. The maximum heparin concentration in the artery exposed to the drug was on day 4 for the P(EAD-SA) uncoated device (fast releasing system) and day 11 for the coated devices. The control artery, the uncovered segments of the artery, and the surrounding tissue contained negligible amounts of radioactivity. These data confirm that heparin was delivered locally without systemic exposure. Two independent animal studies were conducted to evaluate the effectiveness of these heparin-releasing devices. In both studies the balloon catheter injury in a rat model was used. After inflicting an injury to the common carotid, a matrix oriented with its long axis along the artery was placed under the injured portion of the vessel. In both studies the treated rats showed a very thin layer of neointima where the control group showed a significant reduction of the artery internal diameter with SMC neointima ratio greater than 1.
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PMID:Perivascular delivery of heparin for the reduction of smooth muscle cell proliferation after endothelial injury. 1037 Jan 77

Poly(lactic acid) (PLA) was modified by maleic anhydride (MAH), then the resultant MAH modified PLA (MPLA) was acylated with ethylenediamine (EDA), so EDA-MAH modified PLA (EMPLA) was prepared. The results of DSC, FT-IR and NMR testified that MAH and EAD were successfully introduced into the original polymer. The hydrophilicity of EMPLA was considerably increased compared with that of PLA. The degradation experiment showed that the introduction of EDA into the original polymer could neutralize the carboxyl end groups of the degradation products. The results of SEM and MTT of rat osteoblasts cultured in vitro showed that the cytocompatibility and cell adhesion of the modified materials were significantly increased compared with the original polymer, especially EMPLA; the number of cells were obviously increased and cells attached firmly to the material; these were ascribed to the EDA neutralizing the carboxyl end groups of the degradation products.
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PMID:Two-step modification of poly(D, L-lactic acid) by ethylenediamine-maleic anhydride. 1845 89