Biomedical subjects
Publications and source records attributed to T Rossi.
Flexible fiberoptic colonoscopy is a safe and effective diagnostic procedure in infants and children. It is a sensitive and practical procedure that has made substantial contributions to the diagnosis and treatment of colonic disorders in infants and children. With further refinements in technique, future applications of its use are likely to occur.
The pharmacological properties of essential oils obtained from two varieties of Anthemis nobilis was studied. The two varieties, named "white-headed" or double flowered and "yellow-headed", present considerable morphological differences and yield essential oils with different composition. These essential oils proved to possess interesting anti-inflammatory and sedative properties, especially that derived from the "White-headed" variety.
12-O-tetradecanoylphorbol 13-acetate (TPA) and cholecystokinin octapeptide stimulate amylase secretion in dispersed pancreatic acini, presumably acting via the activation of protein kinase C. In this study, we examined TPA pretreatment on the subsequent response of rat pancreatic acini to secretagogues. Acini exposed to TPA (3 X 10(-7) M) at 37 degrees C reduced the subsequent amylase secretion as stimulated by cholecystokinin octapeptide and carbachol, but not by A23187 or VIP. The optimal effect was obtained after 5 min of preincubation with TPA. Longer incubation did not result in greater attenuation. The degree of attenuation was dependent on the concentration of TPA used in the pretreatment. Maximal effect was seen at TPA concentrations of 10(-7) M and higher. Preincubation with TPA resulted in alterations of the dose response of pancreatic acini to cholecystokinin octapeptide. A decrease in amylase secretion was obtained at optimal and suboptimal but not at supraoptimal concentrations of cholecystokinin octapeptide. The peak response to cholecystokinin octapeptide, furthermore, was shifted almost 1 log unit to the right, suggesting a decrease in cholecystokinin binding of the acini following TPA treatment. Binding studies demonstrated a reduction in the specific binding of 125I-labelled cholecystokinin octapeptide to acini following TPA treatment. Analysis of binding data revealed a decrease in affinity and binding capacity of the high-affinity component. No significant change in the binding capacity was detected with the low-affinity component, but a great increase in its affinity was observed. This suggests that the attenuation effect by TPA on the cholecystokinin octapeptide response in rat pancreatic acini in vitro is at the receptor level.
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The mechanism of the contractile effect of dopamine (DA) on the rat isolated seminal vesicle was studied. Cocaine (10 microM/1 in the organ bath, 30 min before DA) and 6-OHDA (50 mg/kg i.v. 24 hr before removal of the seminal vesicle) almost completely prevented the contractile effect of DA. Drugs known to have an affinity for DA receptors or for alpha-adrenoceptors antagonized the contractile effect of DA, the rank order of potency being: prazosin greater than phentolamine greater than yohimbine greater than clonidine greater than sulpiride greater than apomorphine greater than haloperidol. The antagonism was in each case greater against DA than against noradrenaline (NA), used for comparison; selectivity for DA being highest in the case of prazosin and sulpiride. Taken together, these findings indicate that DA makes the rat seminal vesicle contract mostly by means of an indirect mechanism, binding presynaptic DA-receptors and, in part, presynaptic alpha-adrenoceptors as well; or, alternatively, binding presynaptic DA-receptors which have some links with alpha 2-adrenoceptors; the consequence being in either case the release of NA from sympathetic nerve endings.
Adenovirus antigen was detected by radioimmunoassay in the nasopharyngeal specimens of 30 of 74 children with febrile exudative tonsillitis. In the other 44 children, the cause of tonsillitis was identified in 16 (beta-hemolytic streptococci or Epstein-Barr, parainfluenza, or herpes simplex viruses). The clinical picture of adenoviral tonsillitis was difficult to differentiate from that of streptococcal disease; 20 of the patients had originally been given antibiotics. In 68% of patients without complications, the serum concentration of C-reactive protein was less than 20 mg/L, suggesting a viral disease. No other hematologic test was found helpful in identifying the adenoviral tonsillitis. The rapid detection of adenovirus antigen permitted withdrawal of unnecessary and ineffective antibiotic treatment in most patients.
Viral etiology of clinically typical parotitis was studied by virus isolation and serology in 100 consecutive patients presented at the Department of Infectious Diseases, University of Turku, during a period of over 2 years. Mumps etiology was confirmed in 95 cases and in one case a probable parainfluenza type 3 infection was diagnosed by IgM serology. In the remaining 4 patients no etiological evidence of any of the viruses studied was obtained. When different methods to diagnose an acute mumps infection were compared, the most sensitive was the assay for specific IgM antibodies.
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