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Biomedical subjects

A George

Publications and source records attributed to A George.

At least 145 records · Page 8Linked to original sources
PubMed1989

Detection of hydroxyl radical in the mitochondria of ischemic-reperfused myocardium by trapping with salicylate.

Although the presence of free radicals has been indicated in ischemic-reperfused heart, the exact nature and source of these free radicals are not known. The present study utilized a chemical trap, salicylic acid, to trap hydroxyl radical which could be detected as hydroxylated benzoic acid using high pressure liquid chromatography. Since the hydroxylated product is extremely stable, heart was subjected to subcellular fractionation after ischemia and reperfusion, and each fraction was separately examined for the presence of hydroxyl radical. The results indicated for the first time the presence of hydroxyl radical in the mitochondrial fraction during early reperfusion, which decreased in intensity as the reperfusion progressed.

Animals↗
PubMed1989

Amitriptyline versus haloperidol in borderlines: final outcomes and predictors of response.

The authors report the final results of a 4-year study of amitriptyline and haloperidol in 90 symptomatic borderline inpatients. Medication trials were double-blind and placebo controlled and lasted 5 weeks. Haloperidol (4-16 mg/day) produced significant improvement over placebo in global functioning, depression, hostility, schizotypal symptoms, and impulsive behavior. Significant effects of amitriptyline (100-175 mg/day) were generally limited to measures of depression. Factor analysis identified three symptom change patterns: a global depression, hostile depression, and schizotypal symptom pattern. Medication effects favoring haloperidol were most prominent for hostile depression. Variables predicting favorable response to haloperidol included severity of schizotypal symptoms, hostility, and suspiciousness. Schizotypal symptoms and paranoia predicted poor outcome on both depression patterns with amitriptyline. Placebo effects were most prominent on acute state symptoms, with severe character traits predicting poor response.

Amitriptyline↗
PubMed1989

Route-related variation in the immunogenicity of killed Salmonella enteritidis vaccine: role of antigen presenting cells.

In order to assess the role of the route of immunization on the immunogenicity of killed Salmonella vaccine, mice were immunized with killed S. enteritidis by intraperitoneal (i.p.) and intradermal (i.d.) routes. Whereas the former was non-immunogenic, the i.d. immunization generated an excellent delayed-type hypersensitivity response; further, i.p. immunization could even suppress the subsequent i.d. immunization. Since the peritoneal macrophages (MO) are known to be particularly low in Ia or MHC-class II antigens, so essential for antigen presentation, the non-immunogenicity by i.p. route was thought to be due to their poor presentation efficiency. Poly I: poly C, an interferon inducer, is known to enhance the MHC-class II expression; hence effect of poly I: poly C treatment on the immunogenicity of the killed vaccine by i.p. route was tested and indeed the non-immunogenicity was corrected. Poor efficiency of presentation of S. enteritidis antigen by peritoneal cells and its improvement by prior poly I: poly C treatment was further confirmed by in vitro lymphocyte transformation test using primed T cells and peritoneal cells from normal and poly I: poly C treated mice. Poly I: poly C treatment also enhanced expression of Ia antigens on peritoneal cells.

Animals↗
PubMed1989

Free radical scavenging by myocardial fatty acid binding protein.

Recent investigations have indicated the presence of a fatty acid binding protein (FABP) in mammalian heart. This protein binds free fatty acids and their esters with high affinity, however, its physiological role remains unknown. Since FABP constitutes a significant amount of cystolic protein, it is likely that it would be a target for free radical attack. To test this hypothesis, FABP was examined for scavenging against free radicals such as the superoxide anion (O2-), hydroxyl radical (OH.) and hypochlorite radical (OCl.) which may be present in an ischemic reperfused heart. Our results suggest that FABP scavenges O2-, OH. and OCl. as indicated by the FABP inhibition of O2- -dependent reduction of cytochrome c, OH.-dependent hydroxybenzoic acid formation and OCl.-mediated chemiluminescence response. FABP was found to be a more potent scavenger of these free radicals compared to bovine serum albumin. Furthermore, FABP was more effective in scavenging OH. than O2-, and inhibited OH. mediated lipid peroxidation process. These results indicate that FABP can scavenge free radicals which may be present in an ischemic/reperfused heart and, thus, may play a significant physiological role in the heart during ischemia and reperfusion.

Albumins↗
PubMed1988

Optic pit, microphthalmos and orbital cyst.

An orbital cyst was discovered by ultrasonography behind the globe of the left eye in a five-year-old boy with a left esotropia. In addition, an optic pit was present in the optic nerve head of the same eye, which was microphthalmic relative to the right eye. Although orbital cyst has been reported in the literature, this case is of interest because of the presence of two congenital anomalies in the same eye - namely, optic pit and orbital cyst. These two conditions have never been previously reported as existing together in the same eye.

Child, Preschool↗
PubMed1987

Regulation of cell-mediated immunity in mice immunised with Salmonella enteritidis.

The effects of diverse factors, such as route of immunisation, composition of immunogen and administration of interferon inducer, on the expression of cell-mediated immune responses against Salmonella enteritidis were investigated in BALB/c and Swiss white mice. Immunisation with live cells of S. enteritidis by the intraperitoneal route (ip) generated both delayed type hypersensitivity (DTH) and protective cell-mediated immunity (CMI). However, the two responses showed diametrically opposite time kinetics. The decline and disappearance by 9 weeks after ip immunisation of DTH and the rise of protective immunity in the same period suggested the possibility that the two responses were mediated by different subsets of T cells. Immunisation by the intradermal (id) route with a sonicate of S. enteritidis generated only DTH; id immunisation also suppressed the development of the protective response following ip immunisation with live S. enteritidis. Both responses were not seen when T cells were eliminated with anti-T cell serum. Oral immunisation with live cells of S. enteritidis induced excellent CMI expressing both DTH and protective responses. On the other hand, oral immunisation with the sonicate of S. enteritidis not only did not induce CMI, but also prevented the development of the DTH and protective response to ip immunisation with live S. enteritidis. Induction of interferon by the administration of poly I: poly C for four consecutive days after id immunisation with killed S. enteritidis suppressed the generation of DTH.

Animals↗
PubMed1987

Viper bite poisoning in India: a review with special reference to renal complications.

Viper bites are a significant cause of mortality in India. Acute renal failure is a common finding in cases of lethal envenomization. Coagulation abnormalities and shock are other key clinical features. Some of the renal lesions appear to reflect a direct toxic effect of venom on kidney parenchyma. Glomerular, tubular, interstitial, and vascular lesions have all been described. Experimentally, viper venom causes mesangiolysis, and this may be a significant factor in the pathogenesis of viper bite-induced glomerular disease. Treatment with antivenom is commonly used but is not supported by controlled trials. Dialysis and supportive treatment appear to be the mainstay of therapy in cases complicated by renal failure.

Acute Kidney Injury↗
PubMed1987

Characterizing depression in borderline patients.

The comorbidity of depression and borderline disorder was studied in 39 symptomatic borderline inpatients defined by the Diagnostic Interview for Borderlines using three independent methods for assessing depression and three definitions of depression. Evaluations were conducted by the Schedule for Affective Disorders and Schizophrenia interviews for Research Diagnostic Criteria (RDC) depressive disorders, by clinical ratings for atypical depressive disorder, and by self-rated questionnaires for hysteroid dysphoria. Diagnoses of an RDC depression were made in 25 (64.1%), atypical depressive disorder in 16 (41%), and hysteroid dysphoria in 25 (64.1%) of the borderline patients. Two depressive diagnoses were present in 64.1% of patients, while 17.9% of patients met criteria for all three depressive disorders. No one method accurately characterized depression in borderline patients.

Adult↗
PubMed1986

Progress in pharmacotherapy of borderline disorders. A double-blind study of amitriptyline, haloperidol, and placebo.

In symptomatic patients with borderline disorder, we conducted a double-blind, placebo-controlled trial of haloperidol and amitriptyline hydrochloride to test the differential efficacy of medication against the affective and schizotypal symptoms that characterize the disorder. Sixty-one patients, diagnosed by the Diagnostic Interview for Borderline of Gunderson et al, completed randomized trials of haloperidol (n = 21), amitriptyline (n = 20), and placebo (n = 20). Medications were given in dose ranges of 4 to 16 mg for haloperidol (mean, 7.24 mg) and 100 to 175 mg for amitriptyline hydrochloride (mean, 147.62 mg) for five-week periods, with weekly self-rated and observer-rated measures of mood, schizotypal symptoms, and global functioning. Haloperidol was superior to both amitriptyline and placebo on a composite measure of overall symptom severity, with no difference between amitriptyline and placebo. Haloperidol produced significant improvement on a broad spectrum of symptom patterns, including depression, anxiety, hostility, paranoid ideation, and psychoticism. In contrast, amitriptyline was minimally effective, with small gains limited to some areas of depressive content. The magnitude of change tended to be modest and was more apparent in self-rated than observer-rated measures.

Adolescent↗
PubMed1986

Paradoxical effects of amitriptyline on borderline patients.

A paradoxical increase in suicide threats, paranoid ideation, and demanding and assaultive behavior occurred among 15 borderline inpatients receiving amitriptyline in a double-blind study. This pattern differed significantly from that of 14 nonresponding patients receiving placebo.

Aggression↗
PubMed1986

Schizotypal symptoms in patients with borderline personality disorders.

The authors assessed the frequency of schizotypal symptoms in 48 criteria-defined borderline patients. In the total sample schizotypal symptoms were surprisingly common; the average patient had more than seven symptoms and every patient at least one. Even in the "pure" DSM-III borderline subgroup, 67% of the patients had perceptual symptoms, 92% had cognitive symptoms, and 87% reported other "affective" symptoms. Visual phenomena were more prevalent than auditory ones, suggesting a possible contributing role for organic factors in borderline disorders. The results also indicate a close link between borderline and schizotypal personality disorders.

Adult↗
PubMed1986

Supraophthalmic intracarotid infusion of BCNU for malignant glioma.

We treated five patients with 11 supraophthalmic infusions of BCNU at 200 mg/m2 every 2 months. All three patients with residual tumors showed marked CT response after one infusion. Two patients with bilateral tumors had no response on the contralateral side. All four evaluable cases showed evidence of BCNU neurotoxicity. CT findings superficially resembled tumor recurrence, but white matter changes, nonspecific gyral enhancement, and delayed calcification were more indicative of neurotoxicity. There were no procedure-related complications. One autopsy suggested that direct parenchymal damage might be responsible for delayed neurotoxicity. Supraophthalmic BCNU infusion, at this dosage, is too toxic for cerebral tissue.

Adult↗