Spontaneous bacterial peritonitis (SBP) in patients with cirrhotic liver disease is a serious complication that contributes to the high morbidity and mortality rate seen in this population. Currently, there is a lack ...Spontaneous bacterial peritonitis (SBP) in patients with cirrhotic liver disease is a serious complication that contributes to the high morbidity and mortality rate seen in this population. Currently, there is a lack of consensus amongst the research community on the clinical predictors of SBP as well as the risks and benefits of prophylactic antibiotic therapy in these patients. Pharmacological gastric acid suppression (namely with PPIs and H2RAs) are frequently prescribed for these patients, many times without a clear indication, and may contribute to gut bacterial overflow and SBP development. However, this remains controversial as there are conflicting findings in SBP prevalence between PPI/H2RA-users and non-users. In addition, studies show recent antibiotic use, whether for SBP prophylaxis or for another infectious process, appear to be associated with higher rates of SBP and drug-resistant organisms. Other researchers have also explored the link between zinc, platelet indices (MPV), and macrophage inflammatory protein-1 β (MIP-1β) levels in liver cirrhosis, all of which appear to be promising markers for classifying SBP risk and diagnosis. This literature review was limited by the number and quality of studies available as most are retrospective in nature. Thus, more ongoing, prospective studies and trials are needed to judge the true value of the findings in the studies reviewed in hopes that they can guide appropriate prevention, diagnosis, and management of SBP.展开更多
Plant cells recognize microbial patterns with the plasma-membrane-localized pattern-recognition receptors consisting mainly of receptor kinases(RKs) and receptor-like proteins(RLPs). RKs, such as bacterial flagellin r...Plant cells recognize microbial patterns with the plasma-membrane-localized pattern-recognition receptors consisting mainly of receptor kinases(RKs) and receptor-like proteins(RLPs). RKs, such as bacterial flagellin receptor FLS2, and their downstream signaling components have been studied extensively. However, newly discovered regulatory components of RLP-mediated immune signaling, such as the nlp20 receptor RLP23, await identification. Unlike RKs, RLPs lack a cytoplasmic kinase domain, instead recruiting the receptor-like kinases(RLKs) BAK1 and SOBIR1. SOBIR1 specifically works as an adapter for RLP-mediated immunity. To identify new regulators of RLP-mediated signaling, we looked for SOBIR1-binding proteins(SBPs) in Arabidopsis thaliana using protein immunoprecipitation and mass spectrometry,identifying two G-type lectin RLKs, SBP1 and SBP2, that physically interacted with SOBIR1.SBP1 and SBP2 showed high sequence similarity,were tandemly repeated on chromosome 4, and also interacted with both RLP23 and BAK1. sbp1 sbp2 double mutants obtained via CRISPR-Cas9 gene editing showed severely impaired nlp20-induced reactive oxygen species burst, mitogenactivated protein kinase(MAPK) activation, and defense gene expression, but normal flg22-induced immune responses. We showed that SBP1 regulated nlp20-induced immunity in a kinase activityindependent manner. Furthermore, the nlp20-induced the RLP23–BAK1 interaction, although not the flg22-induced FLS2–BAK1 interaction, was significantly reduced in sbp1 sbp2. This study identified SBPs as new regulatory components in RLP23 receptor complex that may specifically modulate RLP23-mediated immunity by positively regulating the interaction between the RLP23 receptor and the BAK1 co-receptor.展开更多
文摘Spontaneous bacterial peritonitis (SBP) in patients with cirrhotic liver disease is a serious complication that contributes to the high morbidity and mortality rate seen in this population. Currently, there is a lack of consensus amongst the research community on the clinical predictors of SBP as well as the risks and benefits of prophylactic antibiotic therapy in these patients. Pharmacological gastric acid suppression (namely with PPIs and H2RAs) are frequently prescribed for these patients, many times without a clear indication, and may contribute to gut bacterial overflow and SBP development. However, this remains controversial as there are conflicting findings in SBP prevalence between PPI/H2RA-users and non-users. In addition, studies show recent antibiotic use, whether for SBP prophylaxis or for another infectious process, appear to be associated with higher rates of SBP and drug-resistant organisms. Other researchers have also explored the link between zinc, platelet indices (MPV), and macrophage inflammatory protein-1 β (MIP-1β) levels in liver cirrhosis, all of which appear to be promising markers for classifying SBP risk and diagnosis. This literature review was limited by the number and quality of studies available as most are retrospective in nature. Thus, more ongoing, prospective studies and trials are needed to judge the true value of the findings in the studies reviewed in hopes that they can guide appropriate prevention, diagnosis, and management of SBP.
基金supported by grants from the National Natural Science Foundation of China (32000202, 32270282, 32000200)the open competition program of the top 10 critical priorities of Agricultural Science and Technology Innovation for the 14th Five-Year Plan of Guangdong Province (2022SDZG07)Double First-class Discipline Promotion Project (2021B10564001)。
文摘Plant cells recognize microbial patterns with the plasma-membrane-localized pattern-recognition receptors consisting mainly of receptor kinases(RKs) and receptor-like proteins(RLPs). RKs, such as bacterial flagellin receptor FLS2, and their downstream signaling components have been studied extensively. However, newly discovered regulatory components of RLP-mediated immune signaling, such as the nlp20 receptor RLP23, await identification. Unlike RKs, RLPs lack a cytoplasmic kinase domain, instead recruiting the receptor-like kinases(RLKs) BAK1 and SOBIR1. SOBIR1 specifically works as an adapter for RLP-mediated immunity. To identify new regulators of RLP-mediated signaling, we looked for SOBIR1-binding proteins(SBPs) in Arabidopsis thaliana using protein immunoprecipitation and mass spectrometry,identifying two G-type lectin RLKs, SBP1 and SBP2, that physically interacted with SOBIR1.SBP1 and SBP2 showed high sequence similarity,were tandemly repeated on chromosome 4, and also interacted with both RLP23 and BAK1. sbp1 sbp2 double mutants obtained via CRISPR-Cas9 gene editing showed severely impaired nlp20-induced reactive oxygen species burst, mitogenactivated protein kinase(MAPK) activation, and defense gene expression, but normal flg22-induced immune responses. We showed that SBP1 regulated nlp20-induced immunity in a kinase activityindependent manner. Furthermore, the nlp20-induced the RLP23–BAK1 interaction, although not the flg22-induced FLS2–BAK1 interaction, was significantly reduced in sbp1 sbp2. This study identified SBPs as new regulatory components in RLP23 receptor complex that may specifically modulate RLP23-mediated immunity by positively regulating the interaction between the RLP23 receptor and the BAK1 co-receptor.
