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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Langer, R. Klibanov, A. M. Choi, W. S. Edwards, D. A. Murthy, G. G. |
| Description | Author Affiliation: Choi WS ( Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 01239, USA.); |
| Abstract | To circumvent inherent problems associated with pulmonary administration of aqueous-solution and dry-powder protein drugs, inhalation delivery of proteins from their suspensions in absolute ethanol was explored both in vitro and in vivo. Protein suspensions in ethanol of up to 9% (wt/vol) were readily aerosolized with a commercial compressor nebulizer. Experiments with enzymic proteins revealed that nebulization caused no detectable loss of catalytic activity; furthermore, enzyme suspensions in anhydrous ethanol retained their full catalytic activity for at least 3 weeks at room temperature. With the use of Zn(2+)-insulin, conditions were elaborated that produced submicron protein particles in ethanol suspensions. The latter (insulin/EtOH) afforded respirable-size aerosol particles after nebulization. A 40-min exposure of laboratory rats to 10 mg/ml insulin/EtOH aerosols resulted in a 2-fold drop in the blood glucose level and a marked rise in the serum insulin level. The bioavailability based on estimated deposited lung dose of insulin delivered by inhalation of ethanol suspension aerosols was 33% (relative to an equivalent s.c. injection), i.e., comparable to those observed in rats after inhalation administration of dry powder and aqueous solutions of insulin. Inhalation of ethanol in a relevant amount/time frame resulted in no detectable acute toxic effects on rat lungs or airways, as reflected by the absence of statistically significant inflammatory or allergic responses, damage to the alveolar/capillary barrier, and lysed and/or damaged cells. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 20 |
| Volume Number | 98 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2001-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Bronchoalveolar Lavage Fluid Chemistry Insulin Administration & Dosage Pharmacokinetics Proteins Administration, Inhalation Aerosols Animals Biological Availability Cytology Drug Stability Ethanol Toxicity Glucuronidase Blood L-Lactate Dehydrogenase Leukocytes Metabolic Clearance Rate Nebulizers And Vaporizers Rats, Sprague-Dawley Zinc Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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