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At least 703 records · Page 39Linked to original sources
PubMed1978

Attempts at analysis of toxicity of pertussis vaccine. III. Effects of endotoxin on leukocytosis in mice due to lymphocytosis-promoting factor and reference preparations for determination of lymphocytosis-promoting factor.

The effect of bacterial endotoxin on the change in peripheral leukocyte population in mice due to the lymphocytosis-promoting factor (LPF) was investigated. Endotoxin affected not only the total leukocyte count but also the leukocyte proportions at any observation time. Both the coefficient and the intercept of regression of the leukocytic response on dose of LPF were modified by endotoxin. Therefore, in a valid biological assay for LPF using the peripheral leukocyte count as a response, a common reference preparation available for any test materials, irrespective of presence or absence of endotoxin, will be impracticable. Two reference preparations were tentatively established, one being a vaccine and the other an LPF preparation containing little endotoxin. A unitage of LP activity was assigned to each reference preparation. The results also showed that an LPF material to be tested for its possible effects on the lymphatic tissues or the reticuloendothelial system should be free from endotoxin.

Animals↗
PubMed1975

Shiga bacillus dysentery associated with marked leukocytosis and erythrocyte fragmentation.

Granulocytic leukemoid reactions (white blood cell counts greater than 50,000 with myelocytes and promyelocytes in the peripheral blood) were documented in 15 per cent of 273 patients with dysentery due to Shigella dysenteriae, type 1 (Shiga bacillus) in Bangladesh. Peak granulocytosis occurred during the second week of illness, when the children were commonly afebrile and diarrhea had ceased or was subsiding. More than half of the patients with leukemoid reactions subsequently developed a fall in hematocrit associated with striking erythrocyte fragmentation on blood smears. Thrombocytopenia occurred during the period of hemolysis in most. Transient oliguric renal failure developed in several patients. Most made a complete recovery. The pathogenesis of the syndrome and the reason for its high incidence were not determined.

Acute Kidney Injury↗
PubMed1987

[Identification of protein products of the operon for leukocytosis (lymphocytosis)-stimulating factor from Bordetella pertussis cloned in Escherichia coli].

The hybrid plasmid pRH119 was constructed on the basis of vector plasmid pUC19 and shown to carry Bordetella pertussis PT operon in the same transcriptional orientation with the lac-promoter of the vector plasmid. Expression of PT genes in E. coli cells harbouring pRH119 was not registered. Weak expression of PT genes was found by immunoscreening of recombinant clones in situ with antiserum against PT when PT genes were put closer to lac-promoter. 0.95 kb SalGI fragment was deleted from pRH119. The derivative plasmid pRH122 was digested by SalGI and the ends were polymerized to "blunt" by polIK and ligated. The obtained plasmid pRH122K was deleted for 40 bp in XbaI site by Bal31 deletion. The lysate of E. coli cells harbouring the resulting plasmid pRH134 passed through Sepharose 4B with covalently bound immunoglobulins from antiserum against PT. The eluted protein contains S2 multimers identified by immunoblotting. The experiments with CHO-cells and active mice protection have shown the absence of S2 multimers protectiveness.

Bacterial Proteins↗
PubMed1988

[Cloning and gene expression of the leukocytosis (lymphocytosis) stimulating factor of Bordatella pertussis in Escherichia coli by bringing the PT genes close to the lactose promoter of plasmid pUC19].

The 4.7 Kb EcoRI-fragment of phase I B. pertussis 475 (serovar 1.2.3.) chromosome carrying all five genes of the pertussis toxin (PT) operon was cloned on plasmid pUC19 in E. coli. The resulting hybrid plasmid pRH119 contained the PT operon in the same orientation of transcription as the lac promoter of plasmid pUC19. Nevertheless, the expression of the PT operon was not observed even after induction with isopropyl thio-beta-D-galactopyranoside (IPTG), which suggested either the inability of the PT operon to work in E. coli, or the presence of a transcription terminator between the lac promoter and the PT operon in plasmid pRH119. The expression was determined by the incubation of the clones harboring plasmid pRH119 with antiserum to PT and their subsequent in situ treatment with 125I-labeled protein A. Three deletion variants of plasmid pRH119 were constructed with the aim of approaching the PT genes to the lac promoter: pRH121 (the 0.45 Kb KpnI-fragment deleted), pRH122 (the 0.95 Kb SalGI-fragment deleted) and pRH123 (the 1.35 Kb XbaI-fragment deleted). In all these cases different levels of expression were observed (but only in the presence of IPTG). Site KpnI in the 4.7 Kb fragment was found to be localized in the -57 b. p. region in relation to the PT promoter, i. e. to lie, seemingly, in the promoter zone; for this reason, the expression of the PT genes in plasmid pRH121 proved the existence of a transcription terminator between the lac promoter and the PT operon in plasmid pRH119.(ABSTRACT TRUNCATED AT 250 WORDS)

Bacterial Proteins↗
PubMed1988

[Detection of the gene sequences of the leukocytosis (lymphocytosis)-stimulating factor of Bordetella pertussis in Bordetella parapertussis and Bordetella bronchiseptica by using molecular hybridization].

The 4.7 Kb EcoRI-fragment of phase I B. pertussis 475 (serovar 1.2.3) chromosome DNA carrying the pertussis toxin (PT) operon was cloned on vector plasmid pUC19 in Escherichia coli. Three fragments (1.14 Kb KpnI-PstI, 1.27 Kb PstI-PstI, and 0.96 Kb PstI-PstI) were obtained from the resulting hybrid plasmid, coded pRH119, by electrophoretic techniques and used as a combined molecular probe for analysis of the EcoRI-digested and PstI-digested chromosomal DNA of B. pertussis strain 475 in phase I, B. pertussis in phase IV, B. parapertussis strains 504 and 17903, B. bronchiseptica strain 214, and B. parapertussis strain 17903 (a convertant obtained by means of B. pertussis phage 134), as well as B. pertussis phage 134. Southern blot hybridization under the conditions of 100% DNA-DNA homology showed the presence of DNA sequences characteristic of the PT operon in all cases except the DNA of phage 134; moreover, the use of the above-mentioned probe made it possible to hybridize all EcoRI-fragments of chromosomal DNA, having the same molecular size (4.7 Kb). Consequently, the PT genes in the above Bordetella species were mapped in identical loci.(ABSTRACT TRUNCATED AT 250 WORDS)

Bacterial Proteins↗
PubMed1986

Epinephrine-induced leukocytosis in acute asthma.

We studied epinephrine-induced changes in leukocyte counts in twelve persons with acute asthma and nine healthy, nonasthmatic individuals. Twenty-five minutes after subcutaneous injection of 0.3 mg of epinephrine, a significant increase in the mean numbers of total leukocytes was observed in both the asthmatic and control subjects, 9,195 to 10,519 and 6,733 to 9,222, respectively. Compared with controls, asthmatic individuals had increased numbers of total leukocytes, segmented neutrophils, and eosinophils prior to epinephrine, and the elevations in segmented neutrophils and eosinophils persisted after epinephrine. The increase in total leukocytes was largely secondary to an increase in lymphocytes. Lymphocyte increases were greater in control than in asthmatic individuals (P less than .001). Of clinical importance is the finding that leukocyte counts drawn shortly after treatment with epinephrine do not suggest infection in patients whose pre-epinephrine counts were normal.

Acute Disease↗