Journal of Microbiology

Journal Article

Short-term effects of returning granulated straw on soil microbial community and organic carbon fractions in dryland farming: Wei Fan , Jinggui Wu; J. Microbiol. 2020;58(8):657-667. Published online June 25, 2020; DOI: https://doi.org/10.1007/s12275-020-9266-5

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We conducted a 2-year field experiment which was comprised of five treatments, namely no straw returning (CK), straw mulching (SM), straw plowed into the soil (SP), and straw returned in granulated form (SG). The aim of this study was to investigate the effects of different straw returning modes on soil bacterial and fungal community structure and their relationships to soil organic carbon (SOC) fractions at three different soil depths (0–20, 20–40, and 40–60 cm) in a dryland under maize cultivation in Northeast (NE) China. SM, SP, and SG treatments significantly increased SOC content. Compared with SM and SP treatments, SG treatment significantly increased the content of SOC and easily oxidizable carbon (EOC) in the topsoil (0–20 cm depth), and increased dissolved organic carbon (DOC) and SOC content of the light fraction (LFOC) in the 20–40 cm layer. Meanwhile, SG treatment exhibited the highest microbial biomass C (MBC) content in all of the three soil depths. SG treatment also enhanced bacterial richness as well as fungal richness and diversity in the upper 40 cm of soil. In addition, SG treatment increased the relative abundance of Proteobacteria in all depths, and had the highest relative abundance of Basidiomycota in the first 20 cm of soil. SP treatment showed the lowest soil organic carbon content in all fractions and soil microbial community composition. SM treatment exhibited similar results to SG treatment in SOC, DOC, and LFOC contents, and bacterial diversity in the topsoil and subsoil. As a whole, treatment SG improved soil quality and maize yield, hence we recommend returning granulated straw as the most effective practice for enhancing labile SOC fractions as well as maintaining soil diversity and microbial richness of arid farmlands in NE China.

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Review

MINIREVIEW] Shiga Toxins Expressed by Human Pathogenic Bacteria Induce Immune Responses in Host Cells: Moo-Seung Lee , Myung Hee Kim , Vernon L. Tesh; J. Microbiol. 2013;51(6):724-730. Published online December 19, 2013; DOI: https://doi.org/10.1007/s12275-013-3429-6

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Abstract

Shiga toxins are a family of genetically and structurally related toxins that are the primary virulence factors produced by the bacterial pathogens Shigella dysenteriae serotype 1 and certain Escherichia coli strains. The toxins are multifunctional proteins inducing protein biosynthesis inhibition, ribotoxic and ER stress responses, apoptosis, autophagy, and inflammatory cytokine and chemokine production. The regulated induction of inflammatory responses is key to minimizing damage upon injury or pathogen-mediated infections, requiring the concerted activation of multiple signaling pathways to control cytokine/chemokine expression. Activation of host cell signaling cascades is essential for Shiga toxinmediated proinflammatory responses and the contribution of the toxins to virulence. Many studies have been reported defining the inflammatory response to Shiga toxins in vivo and in vitro, including production and secretion of tumor necrosis factor alpha (TNF-α), interleukin-1β (IL-1β), macrophage inflammatory protein-1α/β (MIP-1α/β), macrophage chemoattractant monocyte chemoattractant protein 1 (MCP-1), interleukin 8 (IL-8), interleukin 6 (IL-6), and Groβ. These cytokines and chemokines may contribute to damage in the colon and development of life threatening conditions such as acute renal failure (hemolytic uremic syndrome) and neurological abnormalities. In this review, we summarize recent findings in Shiga toxin-mediated inflammatory responses by different types of cells in vitro and in animal models. Signaling pathways involved in the inflammatory responses are briefly reviewed.

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Research Support, Non-U.S. Gov't

DBA/2 Mouse as an Animal Model for Anti-influenza Drug Efficacy Evaluation: Jin Il Kim , Sehee Park , Sangmoo Lee , Ilseob Lee , Jun Heo , Min-Woong Hwang , Joon-Yong Bae , Donghwan Kim , Seok-Il Jang , Mee Sook Park , Man-Seong Park; J. Microbiol. 2013;51(6):866-871. Published online December 19, 2013; DOI: https://doi.org/10.1007/s12275-013-3428-7

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Abstract

Influenza viruses are seasonally recurring human pathogens. Vaccines and antiviral drugs are available for influenza. However, the viruses, which often change themselves via antigenic drift and shift, demand constant efforts to update vaccine antigens every year and develop new agents with broad-spectrum antiviral efficacy. An animal model is critical for such efforts. While most human influenza viruses are unable to kill BALB/c mice, some strains have been shown to kill DBA/2 mice without prior adaptation. Therefore, in this study, we explored the feasibility of employing DBA/2 mice as a model in the development of anti-influenza drugs. Unlike the BALB/c strain, DBA/2 mice were highly susceptible and could be killed with a relatively low titer (50% DBA/2 lethal dose = 102.83 plaque-forming units) of the A/ Korea/01/2009 virus (2009 pandemic H1N1 virus). When treated with a neuraminidase inhibitor, oseltamivir phosphate, infected DBA/2 mice survived until 14 days postinfection. The reduced morbidity of the infected DBA/2 mice was also consistent with the oseltamivir treatment. Taking these data into consideration, we propose that the DBA/2 mouse is an excellent animal model to evaluate antiviral efficacy against influenza infection and can be further utilized for combination therapies or bioactivity models of existing and newly developed anti-influenza drugs.

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Histological Alterations and Immune Response Induced by Pet Toxin During Colonization with Enteroaggregative Escherichia coli (EAEC) in a Mouse Model: Teresita Sainz , Julia Perez , Ma. Cristina Fresan , Veronica Flores , Luis Jimenez , Ulises Hernandez , Ismael Herrera , Carlos Eslava; J. Microbiol. 2002;40(2):91-97.

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Abstract: Enteroaggregative E. coli (EAEC) is an important aethiological causal agent of diarrhea in people of developed and undeveloped countries. Different in vitro and in vivo models have been proposed to study the pathogenic and immune mechanisms of EAEC infection. The aim of this study was to analyze whether BALB/c mice could be used as an animal model to study EAEC pathogenesis. Six-week-old BALB/c mice were inoculated with EAEC strain 042 (O44:H18) nalidixic acid resistant, and re-inoculated ten days after. Mice feces were monitored for the presence of the EAEC strain over a period of 20 days. Bacteria were enumerated on MacConkey agar containing 100 ug of nalidixic acid per ml. Results showed that 35% of the animals were colonized for 3 days, 15% for 5 and 10% for more than 7 days. After re-inoculation only 16% of the animals remained colonized for more than 3 days. During the necropsy, the intestinal fluid of some of the infected animals presented mucus and blood. Six of these fluids showed the presence of IgA antibodies against Pet toxin and IgG antibodies raised against the toxin were also detected in the animal serum. Histopathologic evidence confirms the stimulation of mucus hypersecretion, an increased amount of goblet cells and the presence of bacterial aggregates in the apical surfaces of intestinal epithelial cells. Edema was present in the submucosa. These results suggest that BALB/c mice could be used as an animal model for the in vivo study of EAEC infection.

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