Biomedical subjects
Publications and source records attributed to J N Anderson.
Uterine and vaginal weights and histologies are not altered by ovariectomy or estrogen treatment in the Asian musk shrew (Suncus murinus). In addition, ovariectomized shrews mate. Thus, the role of ovarian hormones in the control of the reproductive status of this species does not conform to the accepted mammalian pattern.
A bronchopancreatic fistula developed in a 14-year-old boy two weeks following transabdominal splenectomy and repair of a ruptured diaphragm. This unusual entity should be suspected when a patient with pancreatitis or pancreatic trauma has pleural complications associated with profuse, frothy sputum. The diagnosis is established by the presence of high levels of amylase in the sputum or by the appearance in the sputum or the bronchi of dye or contrast material injected into the external fistula. The primary goal of treatment, in addition to the management of the thoracic complications, is subdiaphragmatic control of the pancreatic fistula. A brief summary of seven previously reported cases is presented.
Major fracture of the intrathoracic airway following closed chest trauma is a potentially lethal injury which can be repaired successfully if the diagnosis is made early, Cough, dyspnea cyanosis, hemoptysis, mediastinal emphysema, or pneumothorax not responding to drainage via intercostal tube and a deterioration of the patient's clinical condition out of proportion to the apparent closed chest injury, should alert the clinician to the possiblity of this entity. This report describes the findings in a patient with a longitudinal disruption of the entire intrathoracic trachea and the findings in a second patient with complete transection of the right main bronchus. Each was repaired primarily, with eventual recovery, The principles of management of this difficult group of injuries are reviewed.
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Cellulose-bound DNA complementary to ovalbumin mRNA was used in a continous hybridization system to isolate single-stranded DNA molecules containing the ovalbumin gene. Fragmented DNA segments containing the ovalbumin gene were enriched 300-350 fold in one cycle of purification. Two cycles of purification resulted in a DNA fraction which was enriched 2300 fold in the ovalbumin sequence. The method is suitable for purification of the ovalbumin sequence from both sheared DNA fragments, as well as larger molecular weight DNA containing more than twice the number of nucleotides necessary to code for ovalbumin mRNA. The chromatographic procedures were specific and reproducible. In addition, the recovery of ovalbumin DNA was essentially quantitative (80-100%), even when large amounts of starting DNA (70-75 mg) were used. This purification scheme should also be useful for the enrichment of other unique sequence gened form eucaryotic DNA.
The relationship between nuclear binding of the receptor-estrogen complex (R-E) and estrogenic responses was examined. Nuclear-bound R-E was measured by the [3H] estradiol exchange assay, which permits the quantification of R-E as a function of either endogenous or non labeled estrogen. The quantity of nuclear R-E fluctuated as a function of blood levels of estrogen during the estrous cycle in the rat. This indicates that the accumulation of the R-E complex by the nucleus of uterine cells may be of physiologic significance and under the control of endogenous estrogen.
A 38-year-old woman who had a Cope needle biopsy of the pleura was treated for plural tuberculosis on the basis of a positive PPD-S skin test and presence of caseating granulomas in the pleural biopsy. Ten months later she developed a tender, subcutaneous nodule in the area of the previous needle biopsy. Surgical exploration revealed a dumbbell abscess through the chest wall communicating with an area of consolidation in the right middle lobe. En bloc surgical resection of the abscess and peripheral portion of the right middle lobe was curative, although all pathologic and cultural studies of the resected tissue were non-diagnostic.
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The relationship between estrogen receptor(R) binding by uterine nuclei and uterotrophic responses was examined. Immature rats received a single injection of estradiol (E2) or estriol (E3) and the following parameters were measured: accumulation and retention of the estrogen receptor by the nuceus of uterine cells; incorporation of 14C-glucose into CO2 lipid, protein and RNA; RNA polymerase activity; water imbibition and increased dry weight. E2 and E3 were of equal potency with regard to the rapid accumulation of R by the nucleus but differed with respect to long term retention of R. The concentrations of nuclear RE2 and RE3 complexes were equivalent between 1 and 3 hr after estrogen injection; however, by 6 hr RE2 remained significantly elevated while RE3 levels had fallen to control values. E2 and E3 were also of equal potency with respect to the stimulation of enhanced glucose utilization, water imbibition, the incorporation of 14C-glucose into lipid, protein and RNA 3 hours following an injection of the hormone. Likewise the activity of RNA polymerase was equally stimulated by E2 and E3 3 hr after injection. Thus all early uterotropic responses (0-3 hrs) that were measured were equally stimulated by E2 and E3. However, E3 failed to stimulate true uterine growth (increase dry weight 24 hr after injection), whereas E2 produced a significant stimulation of true uterine growth. These data suggest that the RE complex is capable of stimulating early uterotrohic events regardless of which estrogen is present; however, in order to produce true uterine growth the RE complex must be retained in the nucleus for long periods of time. This proposal was tested by the administration of repetitive injections of E3. This treatment resulted in an increase in dry weight that was equivalent to the growth that was produced by repetitive injections of E2. These results demonstrate that E2 and E3 elicit early uterotrophic responses with equal facility following a single injection but that only E2 causes true uterine growth. The ability of E2 to stimulate true uterine growth appears to be related to the time of residence of the RE complex in the nucleus.
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