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Biomedical subjects

M McMahon

Publications and source records attributed to M McMahon.

At least 145 records · Page 8Linked to original sources
PubMed1984

Induction of human mRNAs by interferon.

We have cloned a set of seven cDNAs corresponding to mRNAs induced by type I interferon in human cells, and are using these probes to characterize the response to interferon in detail. We have studied the kinetics of induction of each mRNA in three different human cell lines, the sensitivity of induction to cycloheximide, the effect of withdrawing interferon and the response of a receptor-positive interferon-resistant cell line.

Cell Line↗
PubMed1984

Transcriptional and posttranscriptional regulation of interferon-induced gene expression in human cells.

Eighteen cDNAs, cloned from interferon-treated T98G neuroblastoma cells, correspond to seven different mRNAs induced up to 40-fold by interferon. One codes for metallothionein II and another for a class I HLA. The others do not code for proteins of known sequence. In the continued presence of interferon, accumulation of the mRNAs continues for about 1 day but ceases whenever interferon is removed. Once induced, the mRNAs are stable. Synthesis of new proteins is not required for induction. The rate of transcription of one of the genes doubles 5 min after treatment with interferon and reaches a maximum by 60 min. This rate begins to fall after 4-6 hr, reaching the uninduced level by 8-12 hr. Since the mRNA continues to accumulate after 8-12 hr, posttranscriptional events must also play a role in increasing its level.

Animals↗
PubMed1984

Quinidine-induced lupus erythematosus.

A 60-year-old white man presented with a syndrome of fever, polyarthritis, pleurisy, and lymphopenia, and had a positive antinuclear antibody test (after 5 months of quinidine therapy). Quinidine-induced antinuclear autoantibodies were of the IgM and IgG classes and were directed mainly to nuclear histones, predominantly histones H1 and H2B. Antibodies to native DNA and nonhistone nuclear antigens were not seen during the patient's clinical course. Upon withdrawal of quinidine therapy, the patient had prompt improvement of clinical symptoms followed by a gradual resolution of serologic abnormalities.

Antibodies, Antinuclear↗
PubMed1982

Hyperthermia and the heat-shock proteins of HeLa cells.

When HeLa cells are subject to hyperthermia, the synthesis of specific heat-shock proteins (HSP) is induced under a variety of thermal conditions. HSP synthesis does not occur at temperatures above 43 degrees C but requires return to a culture temperature of 37 degrees C. Maximal induction appears to be achieved if a brief hyperthermia treatment (10 min, 45 degrees -46 degrees C) is followed by 2 h "development" at 37 degrees C. The induction process requires transcription but not DNA replication, and general cell metabolism is probably also required, as induction does not occur if the heat-treated cells are returned to 4 degrees (rather than 37 degrees C) for development. A small proportion of the HSPs of 72-74 Kd are found in nuclei, but do not appear to bind to DNA. The bulk of these proteins, as well as those at 100 Kd, are cytoplasmic, but none are preferentially associated with mitochondria. Increased synthesis of the 100Kd and 72-74 Kd HSPs was also triggered by pretreatment of the cells with 5 x 10(-5) M sodium arsenite.

Amino Acids↗
PubMed1979

Fairmount.

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History, Modern 1601-↗
PubMed1977

A new anorexigen assay: stress-induced hyperphagia in rats.

Humans often respond to stress by overeating. A rat model of hyperphagia induced by a stressful tail-pinch has been described. Consumption of sweetened condensed milk by vaive rats was measured durin the stress. This milk drinking was prevented by pretreatment with d-amphetamine, chlorphentermine, diethylpropion, fenfluramine, methamphetamine, morphine, chlorpromazine and haloperidol. The benzodiazepines chlordiazepoxide and diazepam increased the hyperphagia. The relevance of dopaminergic agonistic and antagonist activities to anorexigenic activity are questioned.

Analgesics↗
PubMed1967

Hour of birth.

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Delivery, Obstetric↗
PubMedDate not supplied

Stressors and stress management--1 month after myocardial infarction.

Stressors and stress management behaviors reported by 52 myocardial infarction (MI) patients were identified from a content analysis of transcriptions of nurse/patient/spouse interactions that took place 30 days postinfarction. Subjects defined stress primarily in terms of distress related to appraisals of harm, loss, or threat. Stressors and stress management behaviors varied, although subjects were similar in age and occupation and were in the same phase of recovery. Most stressors related to recent myocardial infarction and pertained to thoughts and feelings more than to external events. Others, related to family and/or work, were ongoing before the MI. Stress management behaviors comprised a continuum of physical, cognitive, and verbal behaviors ranging from active to passive. Avoidance of situations, ignoring situations, expressing feelings, and thinking things through were the four major modes of stress management behaviors. Implications for rehabilitation nursing practice are identified.

Adaptation, Psychological↗