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Biomedical subjects

M N Guentzel

Publications and source records attributed to M N Guentzel.

15 recordsLinked to original sources
PubMed1992

Human placental transfer of zinc: normal characteristics and role of ethanol.

The fetal alcohol syndrome is primarily an impairment of growth and development. Zinc deficiency also causes abnormal fetal growth. Moreover, alcohol has been shown in some rodent studies to impair placental transport of zinc. The purpose of this investigation was to define better normal human placental zinc transport and the effects of alcohol on this process. To do this we employed the isolated perfused single cotyledon human term placental model, as well as the cultured human cytotrophoblast. In the perfused placental studies, it was shown that zinc is transferred by the placenta very slowly, about 6% of the rate of transport of antipyrine, a freely diffusible marker. The transfer is comparable in both directions, maternal to fetal and the reverse. Zinc does not cross the placenta against a zinc concentration gradient, in either direction. Rather there is good evidence of significant uptake (storage) of the zinc by the placenta on the recirculating compartment side of gradient studies. Moreover, when the perfusion fluid was low (0.2 g/100 ml) in albumin, about twice as much zinc accumulated in the perfused cotyledon and there was less zinc in the maternal compartment, as compared to perfusion with ten-fold higher (2.0 g/100 ml) albumin concentrations. Thus, ligand binding in the perfusate importantly influences placental zinc uptake. Interestingly, however, the increased placental binding of zinc did not translate into greater transfer of zinc to the fetal compartment. Thus, normal zinc transfer is slow, equal bidirectionally, and dependent on ligand binding in perfusate and placenta.(ABSTRACT TRUNCATED AT 250 WORDS)

Culture Techniques↗
PubMed1983

Application of scanning electron microscopy to the study of microorganisms in gastrointestinal pathobiology.

This review describes the application of SEM to the study of microorganisms in gastrointestinal (GI) pathobiology. SEM has proven to be a highly useful tool with a variety of applications in the biological and medical sciences. Examples in this paper are focused on the use of secondary electron imaging to study selected bacterial (cholera), fungal (candidosis), and protozoan (giardiasis) diseases in the GI tract of murine (mouse and rat) experimental models. The successful application of SEM to studies of microorganisms in GI pathobiology requires strict attention to optimal preparative techniques, to selection of the appropriate method and microenvironment(s) for study, and to awareness of the indigenous microorganisms characteristic of the system studied.

Animals↗
PubMed1983

Nature of interaction of different wild type Vibrio cholerae with intestinal mucosa.

Scanning electron microscopy (SEM) was used in this study to investigate the mechanism of association of cholera vibrios with the intestinal mucosa. For this purpose, the interactions of three virulent, wild type strains (CA401, P, and 3083) of Vibrio cholerae with intestinal segments of infant mice were compared. The results of previous studies by different investigators using the three strains separately and in different assay systems had led to differing conclusions concerning the mechanisms of association with the mucosa. In this study, observations by SEM of the infant mouse intestinal segments, previously incubated in suspensions of the organisms, revealed that all three strains preferentially associated with intestinal mucin. The vibrios associated poorly with the mucosal epithelial surface even in areas of the segments free of mucin or in segments washed to remove mucin prior to the assay. In each case, the vibrios associated better with the serosal surface than with the epithelial surface of the mucosa, but not to the degree that they associated with mucin on the mucosal surface. The major difference observed by SEM of the strains was the markedly greater association of strain 3083 with the serosal surface as compared to strains CA401 and P.

Animals↗
PubMed1982

Mice with persistent gastrointestinal Candida albicans as a model for antifungal therapy.

Persistent infection of the gastrointestinal tract of CFW mice with Candida albicans was produced by the oral-intragastric inoculation of 6-day-old infants. Other intraabdominal organs (liver, kidneys, and spleen) were usually free of the organism in survivors at 20 days of age. However, all survivors retained high levels of the organism in the stomach and intestinal tract at 30 days of age. The possible utility of these persisting C. albicans infections of the gastrointestinal tract for the study of the efficacy of short-term antifungal therapy was studied. Drug treatment was initiated for a 2-week period when the survivors were 15 to 19 days old. Some representative antifungal agents in current use (i.e., amphotericin B, 5-fluorocytosine, and miconazole) effected significant reductions in the numbers of C. albicans in homogenates of gastrointestinal organs.

Animals↗
PubMed1982

Effects of compromising agents on candidosis in mice with persistent infections initiated in infancy.

Oral-intragastric inoculation of infant CFW mice with Candida albicans, leading either to lethality or to persistent infection of long duration, provides a useful model for study of the host-pathogen interrelationships in candidosis. Mice were most susceptible to the lethal effects of challenge when 4 to 6 days of age, increasingly resistant up to 10 to 11 days, and then resistant to doses of C. albicans lethal for the younger animals. Older mice harboring persistent infections of the gastrointestinal tract, originally initiated when the animals were 6 days old, were used to study the effects of agents which commonly are administered to cancer patients or which are known to predispose to candidosis. The broad-spectrum antibiotic chloramphenicol, cortisone acetate, X-irradiation, or single high doses of cyclophosphamide (Cytoxan) resulted in markedly enhanced levels of C. albicans in the gastrointestinal tract without systemic spread. Repeated smaller doses of Cytoxan, or treatment with methotrexate or a combination of cortisone acetate and Cytoxan, produced gastrointestinal candidosis associated with invasion and systemic spread. The data indicate that the persistently infected animals provide a realistic model for studying treatments that precipitate candidosis in humans.

Aging↗
PubMed1981

Persistence and spread of Candida albicans after intragastric inoculation of infant mice.

Infant mice have been shown previously to be a useful model for the study of gastrointestinal (GI) and systemic candidosis. In this study, the virulence of four strains of Candida albicans was compared in intragastrically inoculated infants and in adult mice inoculated intravenously. The four strains differed in their ability to kill both infant and adult mice. A smaller inoculum was required to kill adult mice inoculated intravenously. Neonates could not be inoculated intravenously. The ability of the strains to spread systemically from and to persist for long periods of time in the digestive tract was also examined in intragastrically inoculated infants. The yeast cells spread to liver, lungs, kidneys, and spleen within 30 min postinoculation. Yeast were not detectable in the lungs or in blood from the pleural cavity up to 15 min post-inoculation, thus making it unlikely that systemic spread resulted from faulty inoculation or from aspiration. The region where C. albicans crossed the GI tract of infant mice was visualized histologically in the upper third of the small intestine. The four strains varied in their ability to persist for long periods in the GI tract, in the rate at which they appeared systemically, and in ability to kill infant mice. Three of the four strains colonized the gut for up to 10 weeks postinoculation without use of any compromising agents.

Animals↗
PubMed1981

Association of Vibrio cholerae mutants with the intestinal mucosa of infant mice.

Scanning electron microscopy (SEM) was used to observe the nature of association of mutant strains of Vibrio cholerae to infant mouse intestinal segments. Parental strain Inaba CA 401 was compared to the following mutant phenotypes: nonchemotactic, nonchemotactic reduced motility, flagellated nonmotile, nonflagellated nonmotile, and mucin nonutilizing. The virulence of the different strains was determined by oral-intra-gastric inoculation of seven-day-old mice. Localization of the parental strain during the course of infection in the patent gut of infant mice was followed by the fluorescent antibody (FA) technique. The highly virulent parental strain rapidly penetrated intervillus spaces in the upper and lower regions of the small intestine. By SEM the organism also associated markedly with the mucosal surface of intestinal segments. However, the vibrios were associated predominately with the intestinal mucin rather than the epithelial cell surfaces of villi. Nonchemotactic vibrios retained full virulence and ability to associate with the mucosa. The nonchemotactic strain with a reduced rate of motility was partially deficient in these properties. Nonmotile vibrios of either type were markedly reduced in both properties. The mucin nonutilizing strain associated normally but was weakly virulent. Low virulence of this strain may be due to a reduced ability of the organisms to multiply in the mucin.

Animals↗
PubMed1980

Enumeration of potentially pathogenic bacteria from sewage sludges.

To ascertain the health risks that may be posed by the land application of sewage sludges, a scheme was devised to determine the types and numbers of pathogenic and potentially pathogenic bacteria present in sludges. A processing treatment was adapted to sludge to give a homogenate which yielded the greatest numbers of viable bacteria. Conventional methods were successful in enumerating Klebsiella, Staphylococcus, gram-negative enteric bacteria, and commonly used indicator organisms. Modifications of conventional methods improved the enumeration of Salmonella, Mycobacterium sp., fluorescent Pseudomonas sp., and Clostridium perfringens. However, Shigella methodology yielded only one isolate. Utilizing the proposed scheme, the population densities of these organisms were estimated in three domestic wastewater sludges. In light of these results, the potential impact of land application of sewage sludges is discussed.

Bacteria↗
PubMed1979

Systemic and gastrointestinal candidiasis of infant mice after intragastric challenge.

Systemic and gastrointestinal infection can be established in infant mice after intragastric challenge with Candida albicans. Differences in virulence of the six strains tested were noted. As early as 3 h after infection, some but not all livers, spleens, and kidneys contained C. albicans, but the peak number of colony-forming units in these organs was seen at 6 h. The early colonization of the organs could not be attributed to aspiration of the inoculum since about 90% of lungs and livers tested yielded no colony-forming units at 10 to 15 min postinfection. In animals with systemic infections, lungs, livers, kidneys, and spleens showed similar numbers of colony-forming units within the organs during the first 6 h postinfection- and then the number declined progressively up to 72 h. The gastrointestinal tract was colonized throughout a 20-day period of study. Counts made at intervals beyond day 1 yielded between 10(5) and 10(6) colony-forming units in the stomach, ileum, and cecum. Preparatory techniques for scanning electron microscopy preserved the yeast, intestinal mucus layer, and epithelial surface and made it possible to visualize the association between the pathogen and host tissues within the digestive tract.

Administration, Oral↗
PubMed1977

Evaluation of surface components of Vibrio cholerae as protective immunogens.

Surface components of a motile Inaba strain (CA401) were removed from washed cells by low-speed shearing. Flagella contaminated with a vesicular material (designated as crude flagella [CFA1) were obtained by differential centrifugation of the shear fluid. Vesicles were obtained from a nonflagellated mutant by the same procedure. Homogeneous small vesicles were obtained in diminished yield from CsCl gradients of CF preparations. Treatment of CF with sodium deoxycholate removed the vesicular material and flagellar sheaths and yielded naked flagella (NF). The ability of these preparations of passively protect infant mice suckled by CFW mothers that had been immunized at the time of mating was compared, on a dry-weight basis, with commercial vaccine (CV). Eight-day-old mice were challenged orally with more than 1,000 50% lethal doses of either the homologous or a heterologous (Ogawa Ca411) strain. The most effective immunogen was CF, which provided complete protection at 1 microng against both challenges. CF and vesicles provided 50- to 100-fold greater protection than CV against homologous challenge. With heterologous challenge, vesicles were 10-fold more protective than CV, markedly less protective than CF. The NF offered only slightly greater protection than CV against both challenges. Immunoelectrophoresis revealed an antigen in CF distinct from vesicles, cell wall lipopolysaccharide or NF. This antigen is not present in the nonflagellated mutant and is apparently associated with motility,

Animals↗
PubMed1977

Use of fluorescent antibody in studies of immunity to cholera in infant mice.

Infant mice 8 days of age were infected orally with virulent, motile, classical or El Tor strains of Vibrio cholerae and with nonmotile mutants of low virulence derived from the same strains. At intervals of 8 and 12 h postinfection, frozen thin sections of the ileum were prepared, stained with fluorescein isothiocyanate-labeled rabbit anti-vibrio antibody, and examined with the fluorescence microscope. The motile organisms were present in larger numbers, especially at 12h, and had penetrated the intervillous spaces and crypts of Lieberkuhn more completely than nonmotile vibrios. Dilution counts were made on various regions of the intestines of infant mice challenged orally 12 h previously with either motile or nonmotile strains of V. cholerae. Greater numbers of organisms were found, especially in the upper intestinal regions, when motile organisms were used. Low numbers of vibrios, limited mostly to the lumen, were seen in the ileum of infant mice infected with motile organisms when the infants were the offspring of mothers that had been immunized with crude flagellar vaccine or a vesicular preparation derived from the vibrio cell surface. The distribution of vibrios in this case was similar to that found in infected infants of unvaccinated mothers challenged with nonmotile organisms. Motility appears to enable the bacteria to better populate the upper regions of the intestinal tract and to avoid the washing effects of secretions and peristalsis. Antibacterial immunity may function, at least in part, by making it impossible for motile vibrios to accomplish this widespread distribution within the ileum.

Animals↗
PubMed1976

Virulence factors involved in the intraperitoneal infection of adult mice with Vibrio cholerae.

Nonmotile mutants of Vibrio cholerae isolated from Ogawa, Inaba, and El Tor strains were less virulent than parent wild types when administered to adult mice intraperitoneally. The cells were suspended in 5% hog gastric mucin. Antitoxic immunity did not protect mice against this type of challenge, but a ribosomally derived vaccine did. Intraperitoneal injection of 10 50% lethal doses of enterotoxin (based on intravenous doses) was without toxic manifestations as were 10(10) heat-killed vibrios similarly administered, regardless of strain. Virulent organisms killed with formalin or ultraviolet irradiation were significantly lethal at a dose of 10(10) cells. Mice made tolerant to endotoxin were protected from death caused by an injection of 3 X 10(10) boiled cells, but they did not survive an injection of formalin-killed cells. It is believed that the cause of death in this animal model of cholera is dependent, at least in part, on a toxic heat-labile moiety closely associated with the vibrios.

Animals↗
PubMed1975

Motility as a virulence factor for Vibrio cholerae.

The ability of motile strains of the Ogawa and Inaba serotypes of classical Vibrio cholerae and of the El Tor biotypes to kill suckling mice after oral challenge with 10-8 colony-forming units (representing at least 100 to 1,000 minimal lethal doses) was compared to that of nonmotile derivatives of the same strains. Loss of motility, in each case, resulted in a marked reduction in virulence. The mortality (at 36 h) caused by 10 of the 13 nonmotile strains was 32% or less. whereas the motile wild-type strains resulted in nearly 100% deaths. The reduced virulence of the nonmotile strains was associated with reduced capacity to adsorb to the surface of segments of mouse intestine. The mutants were tested for alterations in enterotoxin production and surface properties. The results suggest that motility may contribute to virulence by increasing the chance for association of the vibrios with the intestinal mucosa.

Adsorption↗
PubMed1974

Protection of suckling mice from experimental cholera by maternal immunization: comparison of the efficacy of whole-cell, ribosomal-derived, and enterotoxin immunogens.

The susceptibility of suckling mice to oral infection with several different Vibrio cholerae was determined. Mice up to 10 days of age were uniformly susceptible to oral infection with 10(8) colony-forming units of virulent organisms. Age-dependent resistance occurred thereafter to a maximum at about 15 days of age. The efficacy of selected vaccines was compared by oral challenge of 8-day-old, passively immunized CFW mice. An Ogawa-derived ribosomal antigen was found to be superior to a commercial whole-cell vaccine or to purified cholera enterotoxin. The ribosomal antigen was 50- to 100-fold more protective than the other vaccines on a weight basis against otherwise lethal challenge with Ogawa, Inaba, or El Tor Ogawa serotypes.

Age Factors↗