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At least 847 records · Page 47Linked to original sources
PubMed1973

Control of the production of exo-beta-N-acetylglucosaminidase by Bacillus subtilis B.

1. The control of exo-beta-N-acetylglucosaminidase (EC 3.2.1.30) production by Bacillus subtilis B growing on a chemically defined medium was studied. 2. The enzyme was repressed during exponential growth by those carbon sources that enter the glycolytic pathway above the level of phosphoenolpyruvate. When exponential growth ceased as a result of low concentrations of the nitrogen, carbon or metal ion components of the medium, the enzyme was formed and its amount could be increased by the addition of cell-wall fragments as inducer. 3. The enzyme was de-repressed and could be induced during exponential growth on non-glycolytic compounds metabolized directly into pyruvate, acetyl-CoA or tricarboxylic acid cycle intermediates. 4. The major difference in the metabolism of the organism utilizing these two groups of compound was the existence of high activities of phosphoenolpyruvate carboxylase required for gluconeogenesis. 5. It is concluded that the de-repression of glucosaminidase occurs when the only principal change detected in the intermediary metabolism of the organism was the presence of high activities of phosphoenolpyruvate carboxylase. 6. When the organism was grown on media containing repressing compounds, the enzyme was only de-repressed on entry of the cells into the initial stages of sporulation, where phosphoenolpyruvate carboxylase activity, even in the presence of excess of glucose, increased in parallel with glucosaminidase, neutral proteinase and alkaline phosphatase activities. 7. These results suggest a strong link, at the level of the tricarboxylic acid cycle, between the control of phosphoenolpyruvate carboxylase and the control of the de-repression of glucosaminidase and sporulation.

Acetamides↗
PubMed2000

Muscarinic activation of mitogen-activated protein kinase in PC12 cells.

Muscarinic acetylcholine receptors (mAChRs) activate many downstream signaling pathways, some of which can lead to mitogen-activated protein kinase (MAPK) phosphorylation and activation. MAPKs play roles in regulating cell growth, differentiation, and synaptic plasticity. Here, the activation of MAPK was examined in PC12 cells endogenously expressing mAChRs. Western blot analysis using a phosphospecific MAPK antibody revealed a dose-dependent and atropine-sensitive increase in MAPK phosphorylation in cells stimulated with carbachol (CCh). The maximal response occurred after 5 min and was rapidly reduced to baseline. To investigate the receptors responsible for CCh activation of MAPK in PC12 cells, the mAChR subtypes present were determined using RT-PCR and immunoprecipitation. RT-PCR was used to amplify fragments of the appropriate sizes for m1, m4, and m5, and the identities of the bands were confirmed with restriction digests. Immunoprecipitation using subtype-specific antibodies showed that approximately 95% of the expressed receptors were m4, whereas the remaining approximately 5% were m1 and m5. A highly specific m1 toxin completely blocked MAPK phosphorylation in response to CCh stimulation. The mAChR-induced MAPK activation was abolished by protein kinase C down-regulation and partially inhibited by pertussis toxin. Although m1 represents a small proportion of the total mAChR population, pharmacological evidence suggests that m1 is responsible for MAPK activation in PC12 cells.

Animals↗
PubMed2002

The role of muscarinic acetylcholine receptor-mediated activation of extracellular signal-regulated kinase 1/2 in pilocarpine-induced seizures.

Pilocarpine-induced seizures are mediated by the M(1) subtype of muscarinic acetylcholine receptor (mAChR), but little is known about the signaling mechanisms linking the receptor to seizures. The extracellular signal-regulated kinase (ERK) signaling cascade is activated by M(1) mAChR and is elevated during status epilepticus. Yet, the role of ERK activation prior to seizure has not been evaluated. Here, we examine the role of pilocarpine-induced ERK activation in the induction of seizures in mice by pharmacological and behavioral approaches. We show that pilocarpine induces ERK activation prior to the induction of seizures by both western blot and immunocytochemistry with an antibody to phosphorylated ERK. In addition, we show that the ERK pathway inhibitor SL327 effectively blocks the pilocarpine-induced ERK activation. However, SL327 pretreatment has no effect on the initiation of seizures. In fact, animals treated with SL327 had higher seizure-related mortality than vehicle-treated animals, suggesting activated ERK may serve a protective role during seizures. In addition, ERK inhibition had no effect on the development of the long-term sequelae of status epilepticus (SE), including mossy fiber sprouting, neuronal death and spontaneous recurrent seizures.

Aminoacetonitrile↗
PubMed2000

Conflict-of-interest policies for investigators in clinical trials.

BACKGROUND: There is substantial concern that financial conflicts of interest on the part of investigators conducting clinical trials may compromise the well-being of research subjects. METHODS: We analyzed policies governing conflicts of interest at the 10 medical schools in the United States that receive the largest amount of research funding from the National Institutes of Health. These institutions are Baylor College of Medicine, Columbia University College of Physicians and Surgeons, Harvard Medical School, Johns Hopkins University School of Medicine, the University of Pennsylvania School of Medicine, the University of California at Los Angeles School of Medicine, the University of California at San Francisco School of Medicine, the University of Washington School of Medicine, Washington University School of Medicine at St. Louis, and Yale University School of Medicine. RESULTS: All 10 universities required that faculty members disclose financial interests to university officials. Only four required disclosure by all members of the research staff. Five universities required disclosure of all financial interests, even though federal regulations specify a threshold for disclosure. Six universities required disclosure to the institutional review board as well as to a committee on conflicts of interest or a university official. Four universities had stricter requirements for investigators conducting clinical trials than required by federal regulations. One university prohibited investigators from having stock, stock options, consulting agreements, or decision-making positions involving a company that sponsored the research. A second university prohibited researchers from trading stock or stock options in a company that sponsored the research or sold the product or device under study. Two universities ordinarily did not allow faculty members to participate in clinical research if they had what federal regulations refer to as a "significant" financial interest in the company owning the product or device being studied, but exceptions were allowed. CONCLUSIONS: Policies governing conflicts of interest at leading medical schools in the United States vary widely. We suggest that university-based investigators and research staff be prohibited from holding stock, stock options, or decision-making positions in a company that may reasonably appear to be affected by the results of their clinical research. Of the 10 medical schools we studied, only 1 had a policy that was close to this standard.

Clinical Trials as Topic↗
PubMed1999

Childhood cancer in New Zealand 1990 to 1993.

An epidemiological study of childhood cancer in New Zealand identified 409 children aged 0 to 14 years with malignant neoplasms newly diagnosed between 1990 and 1993 inclusive. The original microscopic material on which the diagnoses were based was reviewed in 398 cases and the neoplasms were allocated into the 12 major groupings and 48 further subcategories of the International Classification of Childhood Cancer (ICCC). The pathology reviewers agreed with group and subcategory classification of the confirmed cancers in all but one case of acute leukemia and three cancers of the central nervous system. Changes were also made in the FAB classification of three cases of acute non-lymphocytic leukemia and in the further subcategorisation of three Hodgkin's lymphomas and ten astrocytomas. The results show a high level of diagnostic accuracy for confirmed childhood neoplasms in that time period. Nine of 15 cases of malignant melanoma notified to the study were not confirmed for various reasons, which included a change in the pathological diagnosis in four cases. Compared with Victoria (Australia), New Zealand has a high incidence rate of lymphomas in boys and an unusual female preponderance of Wilms' tumor cases.

Adolescent↗
PubMed1989

Crohn's disease. A comprehensive approach to management.

Crohn's disease is a complicated illness that affects many body systems and processes. Medical and surgical management are the mainstays of treatment. However, the value of a strong physician-patient relationship in providing an optimistic and supportive structure for the patient cannot be overestimated. As advances continue to be made in understanding the pathophysiology of Crohn's disease, better and more specific therapies will likely emerge. For the present, however, treatment must be aimed at acute exacerbations and is essentially symptomatic. As a result, care must be holistic, with the intent of providing not only pharmacologic therapy but social and psychological support as well.

Crohn Disease↗
PubMed1980

Salmonella pneumonia in a patient with carcinoma of the lung.

A 76-year-old man was hospitalized for pneumonia. Bronchoscopy was performed because of a suspected underlying bronchial malignancy. A squamous cell carcinoma was found on bronchial biopsy, but in addition, culture of the bronchial washings grew Salmonella heidelberg. The infection was successfully treated with tetracycline. Although focal and disseminated infections with S. heidelberg have been reported to occur, pneumonia caused by this organism has not been previously documented.

Aged↗
PubMed1994

Comparison of three regimens recommended by the Centers for Disease Control and Prevention for the treatment of women hospitalized with acute pelvic inflammatory disease.

This six-center, prospective, open-label clinical trial compared the efficacy and safety of three regimens recommended by the Centers for Disease Control and Prevention (CDC) for the treatment of women hospitalized for acute pelvic inflammatory disease (PID). The study focused on the response to inpatient therapy, not on long-term prevention of sequelae. A severity score was used for objective comparison of the degree of illness before and after therapy. Women were randomly assigned (in a 1:1:1 ratio) to treatment with cefoxitin plus doxycycline, clindamycin plus gentamicin, or cefotetan plus doxycycline. Two hundred seventy-five (94.2%) of 292 evaluable women required no alteration in therapeutic regimen. The three regimens produced almost identical cure rates. No serious adverse clinical or laboratory events were observed. In short, the three regimens recommended by the CDC for inpatient therapy of acute PID were similarly effective and safe.

Acute Disease↗
PubMed1987

Quality of life--a review of the literature.

This review of the literature looks at the meaning of the concept 'quality of life', the use to which it has been put in various branches of medicine, its meaning in particular in cancer patients, especially those for whom there is no longer expectation of cure, and the instruments already developed for its measurement and their relevance to terminal care. The review concentrates mainly on patients with terminal malignant disease as the quality of life of other patients is a much broader issue.

Adaptation, Psychological↗
PubMed1991

Microsurgical fertilization and teratozoospermia.

Semen parameters were correlated with the outcome of partial zona dissection (PZD) in 42 couples with male factor infertility. Although fertilization rates were reduced, 12% of the embryos implanted following replacement. Spermatozoa from teratozoospermic sperm populations were able to fuse with oocytes following zona penetration through the artificial gaps. PZD followed by insemination with less than 5% normal spermatozoa led to 20 embryos which, upon replacement, did not implant. Motility and sperm count were not clearly correlated with the outcome of PZD and are therefore less useful indicators for patient selection. Teratozoospermic patients who previously failed to fertilize were compared to a group of similar patients who had not attempted IVF before. Although fertilization was significantly improved in first-time patients, 41% of the patients whose spermatozoa were initially unable to fertilize had at least one embryo when PZD was performed. Several pregnancies were established in this group. Subzonal sperm insertion (SZI) and PZD were compared in 19 patients using sibling oocytes. A significant fraction of spermatozoa from infertile men were able to fuse with the oolemma when directly inserted into the perivitelline area. Using a sucrose solution to shrink the ooplasm, only 1% of the oocytes were damaged during SZI. Monospermic fertilization rates following PZD and SZI were 15 and 16%, respectively. Both micromanipulation methods were successful in most patients. However, in two small groups of patients, only one technique resulted in fertilization.

Female↗
PubMed1984

Measurements of social support in schizophrenia.

A selective review of the literature reveals some methods and instruments that show promise for the investigation of social support as a factor in the course and treatment of schizophrenia. Approaches are divided into social-psychological questionnaires, anthropological network studies, ethnographies, and clinical epidemiological investigations. Social support measures designed for the general population probably have little relevance in schizophrenia. It appears that the most useful information comes from immersion in the experience of the patients, families, and caretakers rather than from an effort to develop a measure of social support in general that would be applicable to them.

Anthropology↗