David E Loudy

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The lungs are divided, both structurally and functionally, into two distinct components, the proximal airways, which conduct air, and the peripheral airways, which mediate gas exchange. The mechanisms that control the specification of these two structures during lung development are currently unknown. Here we show that beta-catenin signaling is required for(More)
The GABA-transaminase inhibitor, vigabatrin, has been shown to have a rather low degree of acute toxicity in several animal species. Oral administration of the drug at 1,000 mg/kg/day for 2-4 weeks caused decreased food consumption and weight loss with resultant prostration and death in both rats and dogs. Dosages of 200 mg/kg/day were tolerated for a year(More)
Thyroid transcription factor 1 (TTF-1/Nkx-2.1) plays a critical role in lung morphogenesis and regulates the expression of lung-specific genes, including the surfactant proteins required for pulmonary function after birth. The activity of TTF-1 is influenced by its interactions with other transcription factors and coactivators, including CBP/p300 and SRC-1.(More)
To identify relationships amongst tracheal and alveolar epithelial cells during lung development, we used conditional systems controlled by the rat CCSP and human SFTPC gene promoters to express Cre-recombinase in the developing mouse lung, thereby permanently labeling cells by expression of alkaline phosphatase or green fluorescent protein. When controlled(More)
Subacute (2 week) oral or intravenous administration of DL-alpha-difluoromethylornithine (DFMO), an irreversible inhibitor of ornithine decarboxylase (ODC), caused diarrhea and frequent emesis as early as 4 to 5 days in dogs (dose greater than or equal to 200 mg/kg/day). Diarrhea also occurred in monkeys after 1 week of treatment with an intravenous dose of(More)
MDL 101,731, (E)2'-fluoromethylene-2'-deoxycytidine, is an irreversible inhibitor of ribonucleotide diphosphate reductase and causes regression of human tumors in nude mouse models. Messenger RNA levels for testosterone-repressed prostatic message-2 (TRPM-2), a transcript that increases in human tumor xenografts undergoing programmed cell death, were(More)
The effects of three bisethyl polyamine analogs on mitochondrial structure and function were examined in human HeLa and L1210 murine leukemia cells. N, N' Bis-[3(ethylamino)-propyl]1-7- heptane diamine (BEPH), and its octane (BEPO), and butane (BESPM) derivative, were shown by electron microscopy and/or Rhodamine 123 uptake studies to alter the structural(More)
Nine male and nine female Beagle dogs were divided into three groups and administered orally 0, 15, or 30 mg/kg/day of the antidepressant compound MDL 19,660(5-(4-chlorophenyl)-2,4-dihydro-2,4-dimethyl-3H-1,2,4-triazole-3-t hione) for 3 months to determine the long-term effects on hemopoietic cells. Compared to a control platelet range of(More)
Red blood cell parasites were identified electron microscopically in five anemic adult female cynomolgus monkeys (Macaca fascicularis), two of which died during anemic episodes. Organisms typically were 0.3-0.5-micron round, oval, or reniform bodies on the surface or within vacuoles of erythrocytes. Based on their size, location in the erythrocyte, and(More)