mortality/aging
• most mice treated with doxycycline from E0 die on P1
|
• 50% of mice treated with doxycycline from E0 through P16 died within 30 days of birth
(J:88601)
• only 46% of mice treated with doxycycline from E0 survive to P5
(J:93473)
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hematopoietic system
• observed in bronchoalveolar lavage from mice treated with doxycycline from E0 through P16
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• observed in bronchoalveolar lavage from mice treated with doxycycline from E0 through P16
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immune system
• observed in bronchoalveolar lavage from mice treated with doxycycline from E0 through P16
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• observed in bronchoalveolar lavage from mice treated with doxycycline from E0 through P16
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respiratory system
• mice treated with doxycycline from E0 and found to be in distress or moribund on P1 display pulmonary congestion
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• impaired alveogenesis marked by fewer peripheral lung saccules and decreased alveolar septation; apparent at 3 days of age in mice treated with doxycycline from E0 through P16
(J:88601)
|
• at E18.5, mice treated with doxycycline from E0 display immature peripheral lung saccules, resembling those normally seen at E16-E17
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• at E18.5, squamous type I cells are missing, alveolar walls are thickened and lined by immature cuboidal type II cells, cytoplasmic glycogen is dispersed, and apical microvilli are absent
• however, no evidence of capillary leakage or endothelial cell abnormalities are observed
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• at E18.5, no squamous type I cells are observed in mice treated with doxycycline from E0
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• at E18.5, mice treated with doxycycline from E0 show absence of lamellar bodies in alveolar type II cells
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• at E18.5, mice treated with doxycycline from E0 show thickened alveolar walls lined by immature cuboidal type II cells
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atelectasis
(
J:93473
)
• mice treated with doxycycline from E0 and found to be in distress or moribund on P1 display focal or extensive atelectasis
|
• increased airspace in mice prenatally treated with doxycycline
• postnatal treatment with doxycycline also resulted in increased airspace but to a lesser extent
• normal prenatal lung morphogenesis
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• mice treated with doxycycline from E0 and found to be in distress or moribund on P1 display hyaline membrane formation
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• goblet cell hyperplasia, associated with the accumulation of both neutral and acidic mucins, observed in mice treated with doxycycline from E0 through P16
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• ~50% of mice treated with doxycycline from E0 develop severe respiratory distress within 2-3 hrs of birth
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• at E18.5, the fractional content of phosphatidylcholine (PC) and saturated PC are markdely reduced, whereas that of phosphatidylethanolamine, sphingomyelin, and phosphatidylserine is increased in the lungs of mice treated with doxycycline from E0
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• SP-A, SP-B, and SP-C mRNAs are significantly decreased at E18.5
• the active SP-B peptide is markedly decreased in lung homogenates prior to birth
• SP-D mRNAs are significantly increased at E18.5
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• at E18.5, no secreted surfactant is detected in the air spaces of mice treated with doxycycline from E0
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homeostasis/metabolism
behavior/neurological
• newborn mice are frequently cannibalized by the mother
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cardiovascular system
• mice treated with doxycycline from E0 and found to be in distress or moribund on P1 display pulmonary congestion
|