1
|
Dessai S, Deshpande H. IV Colistin: A Rare Cause of Bartter-Like Syndrome in Adults. Cureus 2023; 15:e50672. [PMID: 38229782 PMCID: PMC10790154 DOI: 10.7759/cureus.50672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 12/17/2023] [Indexed: 01/18/2024] Open
Abstract
Bartter syndrome is a genetic condition characterized by autosomal recessive inheritance, resulting in impaired salt reabsorption and clinical manifestations such as low/normal blood pressure and extracellular fluid volume depletion. Multiple abnormalities of the electrolytes, including decreased potassium as well as chloride levels and, in some instances, hypomagnesemia, are its defining features. Metabolic alkalosis, hypokalaemia, hypocalcemia, and hypomagnesemia, together with adequate renal function, are all components of the Bartter-like syndrome. It is associated with certain antibiotics and antineoplastic drugs. We report a case of traumatic brain injury with pneumothorax who was on treatment on colistin and presented with metabolic disturbance.
Collapse
Affiliation(s)
- Saiesh Dessai
- Department of Anaesthesiology, Jawaharlal Nehru Medical College, Datta Meghe Institute of Higher Education & Research, Wardha, IND
| | - Hemant Deshpande
- Department of Anaesthesiology, Jawaharlal Nehru Medical College, Datta Meghe Institute of Higher Education & Research, Wardha, IND
| |
Collapse
|
2
|
Nasal sprays for treating COVID-19: a scientific note. Pharmacol Rep 2023; 75:249-265. [PMID: 36848033 PMCID: PMC9969373 DOI: 10.1007/s43440-023-00463-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 02/06/2023] [Accepted: 02/07/2023] [Indexed: 03/01/2023]
Abstract
Clinical management of COVID-19 has been a daunting task. Due to the lack of specific treatment, vaccines have been regarded as the first line of defence. Innate responses and cell-mediated systemic immunity, including serum antibodies, have been the primary focus of practically all studies of the immune response to COVID-19. However, owing to the difficulties encountered by the conventional route, alternative routes for prophylaxis and therapy became the need of the hour. The first site invaded by SARS-CoV-2 is the upper respiratory tract. Nasal vaccines are already in different stages of development. Apart from prophylactic purposes, mucosal immunity can be exploited for therapeutic purposes too. The nasal route for drug delivery offers many advantages over the conventional route. Besides offering a needle-free delivery, they can be self-administered. They present less logistical burden as there is no need for refrigeration. The present article focuses on various aspects of nasal spray for eliminating COVID-19.
Collapse
|
3
|
Peer Support and Exercise Adherence in Adolescents: The Chain-Mediated Effects of Self-Efficacy and Self-Regulation. CHILDREN (BASEL, SWITZERLAND) 2023; 10:children10020401. [PMID: 36832530 PMCID: PMC9955246 DOI: 10.3390/children10020401] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/25/2023] [Accepted: 02/15/2023] [Indexed: 02/22/2023]
Abstract
In the context of exercise psychology, the mediating relationship between peer support, self-efficacy and self-regulation, and adolescents' exercise adherence was to be explored. METHODS A questionnaire was distributed among 2200 teenagers from twelve middle schools in Shanghai. The "process" program in SPSS and the bootstrap method were applied to construct and analyze the direct and indirect effects of peer support on adolescents' exercise adherence. RESULTS Peer support directly affected adolescents' exercise adherence (β = 0.135, p < 0.001, effect size of 59%) and self-efficacy (β = 0.493, p < 0.001, effect size accounted for 42%), and self-regulation (β = -0.184, p < 0.001, effect size of 11%) influenced exercise adherence indirectly. In addition, self-efficacy and self-regulation could impose a chain-mediated effect on peer support and exercise adherence (effect size of 6%). CONCLUSION Peer support could promote adolescents' exercise adherence. Self-efficacy and self-regulation are mediating factors of peer support on exercise adherence in teenagers, self-regulation as well as self-efficacy-imposed chain-mediating effects on peer support and adolescents' exercise adherence.
Collapse
|
4
|
Scognamiglio I, Cocca L, Puoti I, Palma F, Ingenito F, Quintavalle C, Affinito A, Roscigno G, Nuzzo S, Chianese RV, Belli S, Thomas G, Schomann T, Chan A, Stoppelli MP, Condorelli G. Exosomal microRNAs synergistically trigger stromal fibroblasts in breast cancer. MOLECULAR THERAPY. NUCLEIC ACIDS 2022; 28:17-31. [PMID: 35317202 PMCID: PMC8908025 DOI: 10.1016/j.omtn.2022.02.013] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 02/17/2022] [Indexed: 12/13/2022]
Abstract
Triple-negative breast cancer (TNBC) is the most aggressive breast cancer subtype. TNBC progression is sustained by recruitment of a strong tumor microenvironment (TME) mainly composed of cancer-associated fibroblasts (CAFs) able to endorse tumor hallmarks. Increasing evidences demonstrate that exosomes mediate the crosstalk between cancer cells and the TME. We examined TNBC-derived exosomes and their microRNA (miRNA) cargo in activation of normal fibroblasts (NFs) toward CAFs. We demonstrated that TNBC cell-derived exosomes increased NF collagen contraction and migration alongside CAF molecular markers. Exosome-activated fibroblasts promoted the invasion potential of normal breast epithelial cells, as assessed by an organotypic co-culture assay that resembled the in vivo context. We also investigated TNBC cell-derived exosome cargo in activating NFs to CAFs by performing small RNA sequencing. We found that the synergistic action of miR-185-5p, miR-652-5p, and miR-1246 boosted fibroblast migration and contraction, promoting specific CAF subspecialization toward a pro-migratory functional state. These data highlight the role of breast cancer cells in re-education of the TME and their contribution to tumor evolution.
Collapse
Affiliation(s)
- Iolanda Scognamiglio
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, Via Pansini 5, 80131 Naples, Italy
| | - Lorenza Cocca
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, Via Pansini 5, 80131 Naples, Italy
| | - Ilaria Puoti
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, Via Pansini 5, 80131 Naples, Italy
| | - Francesco Palma
- Percuros BV, Eerbeeklaan 42, 2573 HT Den Haag, the Netherlands
| | | | - Cristina Quintavalle
- Institute of Endocrinology and Experimental Oncology G. Salvatore (IEOS), National Research Council (CNR), Via Pansini 5, 80131 Naples, Italy
| | | | | | - Silvia Nuzzo
- IRCCS SYNLAB SDN, Via Gianturco 113, 80143 Naples, Italy
| | - Rosario Vincenzo Chianese
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, Via Pansini 5, 80131 Naples, Italy
| | - Stefania Belli
- Institute of Genetics and Biophysics (IGB), National Research Council (CNR), Via Castellino 111, 80131 Naples, Italy
| | | | - Timo Schomann
- Percuros BV, Eerbeeklaan 42, 2573 HT Den Haag, the Netherlands.,Department of Radiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, the Netherlands
| | - Alan Chan
- Percuros BV, Eerbeeklaan 42, 2573 HT Den Haag, the Netherlands
| | - Maria Patrizia Stoppelli
- Institute of Genetics and Biophysics (IGB), National Research Council (CNR), Via Castellino 111, 80131 Naples, Italy
| | - Gerolama Condorelli
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, Via Pansini 5, 80131 Naples, Italy.,Institute of Endocrinology and Experimental Oncology G. Salvatore (IEOS), National Research Council (CNR), Via Pansini 5, 80131 Naples, Italy
| |
Collapse
|
5
|
Diagnostic and Prognostic Significance of microRNA-208a in Acute Myocardial Infarction. DISEASE MARKERS 2022; 2022:7030722. [PMID: 35607440 PMCID: PMC9124095 DOI: 10.1155/2022/7030722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 03/31/2022] [Accepted: 04/04/2022] [Indexed: 11/25/2022]
Abstract
Objective To determine the prognostic and diagnostic significance of microRNA-208a (miR-208a) in acute myocardial infarction (AMI). Methods Totally, 84 AMI patients hospitalized in our hospital between Jan. 2019 and Feb. 2021 were enrolled as the patient group (Pat group), and 50 healthy individuals over same time span as the control group (Con group). qRT-PCR assay was carried out to quantify serum miR-208a in the patients and receiver-operating characteristic (ROC) curves for analysing its diagnostic value in AMI patients and its predictive value in clinical efficacy and adverse events in the patients after therapy. The changes of miR-208a and clinical indexes ((lactate dehydrogenase (LDH), creatine kinase (CK) as well as Creatine kinase-MB (CK-MB)) in the patients before and after therapy were evaluated. Pearson's test was adopted to analyse the associations of miR-208a with clinical indexes. Additionally, the target genes of miR-208a were forecasted. Results The patient group showed a higher miR-208a level than the control group (p < 0.05), and the area under the curve (AUC) of miR-208a in diagnosing AMI was >0.9. After therapy, patients presented notable decreases in serum miR-208a, LDH, CK, and CK-MB (all p < 0.05). Serum miR-208a presented positive associations with LDH, CK, as well as CK-MB both before and after therapy (all p < 0.05). Before therapy, the ineffective group presented a higher miR-208a level than the effective group (p < 0.05), and miR-208a had an AUC of 0.784 in forecasting efficacy. Additionally, the group with adverse events presented a higher miR-208a level than the group without them before therapy (p < 0.05), and miR-208a had an AUC of 0.713 in forecasting adverse events. According to enrichment analysis, the target genes of miR-208a were bound up with signal pathways of cellular senescence, MTOR and Wnt. Conclusion With high expression in AMI cases, miR-208a is a promising potential biomarker for diagnosis and prognosis forecasting of AMI.
Collapse
|
6
|
FTO mediated ERBB2 demethylation promotes tumor progression in esophageal squamous cell carcinoma cells. Clin Exp Metastasis 2022; 39:623-639. [PMID: 35524932 PMCID: PMC9338917 DOI: 10.1007/s10585-022-10169-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 04/14/2022] [Indexed: 12/17/2022]
Abstract
N6-methyladenosine (m6A) is the most prevalent and internal modification that occurs in the messenger RNAs of eukaryotes. However, knowledge of the impact of these modifications on gene expression regulation remains limited. By using the in vitro MeRIP-seq and RNA-seq assays, we discovered that the mRNA demethylase FTO was significantly up-regulated in esophageal squamous cell carcinoma (ESCC) tissues and cells. Knockdown of FTO drastically suppressed the proliferation, migration, and invasion of ESCC cells. Furthermore, by using transcriptome-wide m6A-seq and RNA-seq assays, we identified ERBB2 is the target of FTO, which acts in concert in ESCC tumorigenesis and metastasis. Moreover, loss and gain functional studies suggested that the m6A reader YTHDF1 stabilizes ERBB2 mRNA via decoding the m6A modification. All these results uncovered a new signaling cascade, including FTO, YTHDF1, and ERBB2, which finely regulates the ESCC progression.
Collapse
|
7
|
Wang Y, Hong C, Wu Z, Li S, Xia Y, Liang Y, He X, Xiao X, Tang W. Resveratrol in Intestinal Health and Disease: Focusing on Intestinal Barrier. Front Nutr 2022; 9:848400. [PMID: 35369090 PMCID: PMC8966610 DOI: 10.3389/fnut.2022.848400] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 02/07/2022] [Indexed: 12/14/2022] Open
Abstract
The integrity of intestinal barrier determines intestinal homeostasis, which could be affected by various factors, like physical, chemical, and biological stimuli. Therefore, it is of considerable interest and importance to maintain intestinal barrier function. Fortunately, many plant polyphenols, including resveratrol, could affect the health of intestinal barrier. Resveratrol has many biological functions, such as antioxidant, anti-inflammation, anti-tumor, and anti-cardiovascular diseases. Accumulating studies have shown that resveratrol affects intestinal tight junction, microbial composition, and inflammation. In this review, we summarize the effects of resveratrol on intestinal barriers as well as the potential mechanisms (e.g., inhibiting the growth of pathogenic bacteria and fungi, regulating the expression of tight junction proteins, and increasing anti-inflammatory T cells while reducing pro-inflammatory T cells), and highlight the applications of resveratrol in ameliorating various intestinal diseases.
Collapse
Affiliation(s)
- Youxia Wang
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Changming Hong
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Zebiao Wu
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Shuwei Li
- Animal Breeding and Genetics Key Laboratory of Sichuan Province, Sichuan Animal Science Academy, Chengdu, China
- Livestock and Poultry Biological Products Key Laboratory of Sichuan Province, Sichuan Animtech Feed Co., Ltd., Chengdu, China
| | - Yaoyao Xia
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Yuying Liang
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Xiaohua He
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Xinyu Xiao
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Wenjie Tang
- Animal Breeding and Genetics Key Laboratory of Sichuan Province, Sichuan Animal Science Academy, Chengdu, China
- Livestock and Poultry Biological Products Key Laboratory of Sichuan Province, Sichuan Animtech Feed Co., Ltd., Chengdu, China
- *Correspondence: Wenjie Tang
| |
Collapse
|
8
|
Ji X, Meng W, Liu Z, Mu X. Emerging Roles of lncRNAs Regulating RNA-Mediated Type-I Interferon Signaling Pathway. Front Immunol 2022; 13:811122. [PMID: 35280983 PMCID: PMC8914027 DOI: 10.3389/fimmu.2022.811122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 02/01/2022] [Indexed: 12/14/2022] Open
Abstract
The type-I interferon (IFN-I) signaling pathway plays pivot roles in defending against pathogen invasion. Exogenous ssRNA and dsRNA could be immunogenic. RNA-mediated IFN signaling is extensively studied in the field. The incorrect functioning of this pathway leads to either autoimmune diseases or suffering from microorganism invasion. From the discrimination of “self” and “non-self” molecules by receptors to the fine-tune modulations in downstream cascades, all steps are under the surveillance featured by complex feedbacks and regulators. Studies in recent years highlighted the emerging roles of long noncoding RNAs (lncRNAs) as a reservoir for signaling regulation. LncRNAs bind to targets through the structure and sequence, and thus the mechanisms of action can be complex and specific. Here, we summarized lncRNAs modulating the RNA-activated IFN-I signaling pathway according to the event order during the signaling. We hope this review help understand how lncRNAs are participating in the regulation of IFN-I signaling.
Collapse
Affiliation(s)
- Xiaoxin Ji
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
- Tianjin University and Health-Biotech United Group Joint Laboratory of Innovative Drug Development and Translational Medicine, Tianjin University, Tianjin, China
| | - Wei Meng
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
- Tianjin University and Health-Biotech United Group Joint Laboratory of Innovative Drug Development and Translational Medicine, Tianjin University, Tianjin, China
| | - Zichuan Liu
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
- Tianjin University and Health-Biotech United Group Joint Laboratory of Innovative Drug Development and Translational Medicine, Tianjin University, Tianjin, China
- *Correspondence: Zichuan Liu, ; Xin Mu,
| | - Xin Mu
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
- Tianjin University and Health-Biotech United Group Joint Laboratory of Innovative Drug Development and Translational Medicine, Tianjin University, Tianjin, China
- *Correspondence: Zichuan Liu, ; Xin Mu,
| |
Collapse
|
9
|
Gohil S, Vuik S, Darzi A. Sentiment Analysis of Health Care Tweets: Review of the Methods Used. JMIR Public Health Surveill 2018; 4:e43. [PMID: 29685871 PMCID: PMC5938573 DOI: 10.2196/publichealth.5789] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 10/31/2016] [Accepted: 03/14/2017] [Indexed: 01/24/2023] Open
Abstract
Background Twitter is a microblogging service where users can send and read short 140-character messages called “tweets.” There are several unstructured, free-text tweets relating to health care being shared on Twitter, which is becoming a popular area for health care research. Sentiment is a metric commonly used to investigate the positive or negative opinion within these messages. Exploring the methods used for sentiment analysis in Twitter health care research may allow us to better understand the options available for future research in this growing field. Objective The first objective of this study was to understand which tools would be available for sentiment analysis of Twitter health care research, by reviewing existing studies in this area and the methods they used. The second objective was to determine which method would work best in the health care settings, by analyzing how the methods were used to answer specific health care questions, their production, and how their accuracy was analyzed. Methods A review of the literature was conducted pertaining to Twitter and health care research, which used a quantitative method of sentiment analysis for the free-text messages (tweets). The study compared the types of tools used in each case and examined methods for tool production, tool training, and analysis of accuracy. Results A total of 12 papers studying the quantitative measurement of sentiment in the health care setting were found. More than half of these studies produced tools specifically for their research, 4 used open source tools available freely, and 2 used commercially available software. Moreover, 4 out of the 12 tools were trained using a smaller sample of the study’s final data. The sentiment method was trained against, on an average, 0.45% (2816/627,024) of the total sample data. One of the 12 papers commented on the analysis of accuracy of the tool used. Conclusions Multiple methods are used for sentiment analysis of tweets in the health care setting. These range from self-produced basic categorizations to more complex and expensive commercial software. The open source and commercial methods are developed on product reviews and generic social media messages. None of these methods have been extensively tested against a corpus of health care messages to check their accuracy. This study suggests that there is a need for an accurate and tested tool for sentiment analysis of tweets trained using a health care setting–specific corpus of manually annotated tweets first.
Collapse
Affiliation(s)
- Sunir Gohil
- Imperial College London, Department of Surgery and Cancer, London, United Kingdom
| | - Sabine Vuik
- Imperial College London, Department of Surgery and Cancer, London, United Kingdom
| | - Ara Darzi
- Imperial College London, Department of Surgery and Cancer, London, United Kingdom
| |
Collapse
|
10
|
Koelzer VH, Rothschild SI, Zihler D, Wicki A, Willi B, Willi N, Voegeli M, Cathomas G, Zippelius A, Mertz KD. Systemic inflammation in a melanoma patient treated with immune checkpoint inhibitors-an autopsy study. J Immunother Cancer 2016; 4:13. [PMID: 26981243 PMCID: PMC4791920 DOI: 10.1186/s40425-016-0117-1] [Citation(s) in RCA: 145] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 02/09/2016] [Indexed: 01/05/2023] Open
Abstract
Background Immune checkpoint inhibitors targeting cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) and programmed cell death protein 1 (PD-1) have been recently approved for treatment of patients with metastatic melanoma and non-small cell lung cancer (NSCLC). Despite important clinical benefits, these therapies are associated with a diverse spectrum of immune-related adverse events (irAEs) that are typically transient, but occasionally severe or even fatal. Case presentation This autopsy case illustrates that clinically overt irAEs may represent only a fraction of the total spectrum of immune-related organ pathology in patients treated with immune checkpoint inhibitors. We report a comprehensive analysis of systemic irAE pathology based on the autopsy of a 35-year-old female patient with metastatic melanoma treated first with ipilimumab and then nivolumab. The clinical course was characterized by a mixed tumor response with regression of skin and lung metastases and fatal progression of metastatic disease in the small bowel, peritoneum and brain. During therapy with ipilimumab, radiographic features of immune-related pneumonitis were noted. The autopsy examination established a sarcoid-like granulomatous reaction of the lung, pulmonary fibrosis and diffuse alveolar damage. Importantly, a clinically unapparent but histologically striking systemic inflammation involving the heart, central nervous system, liver and bone marrow was identified. Severe immune-related end-organ damage due to lymphocytic myocarditis was found. Conclusions Autopsy studies are an important measure of quality control and may identify clinically unapparent irAEs in patients treated with immunotherapy. Pathologists and clinicians need to be aware of the broad spectrum of irAEs for timely management of treatment-related morbidity. Electronic supplementary material The online version of this article (doi:10.1186/s40425-016-0117-1) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Viktor H Koelzer
- Institute of Pathology, Cantonal Hospital Baselland, Mühlemattstrasse 11, CH-4410 Liestal, Switzerland ; Translational Research Unit (TRU), Institute of Pathology, University of Bern, Murtenstrasse 31, CH-3010 Bern, Switzerland
| | - Sacha I Rothschild
- Division of Medical Oncology, University Hospital Basel, Petersgraben 4, CH-4031 Basel, Switzerland
| | - Deborah Zihler
- Department of Medical Oncology, Cantonal Hospital Baselland, Mühlemattstrasse 11, CH-4410 Liestal, Switzerland
| | - Andreas Wicki
- Division of Medical Oncology, University Hospital Basel, Petersgraben 4, CH-4031 Basel, Switzerland
| | - Berenika Willi
- Institute of Radiology, Cantonal Hospital Baselland, Mühlemattstrasse 11, CH-4410 Liestal, Switzerland
| | - Niels Willi
- Institute of Pathology, Cantonal Hospital Baselland, Mühlemattstrasse 11, CH-4410 Liestal, Switzerland
| | - Michèle Voegeli
- Department of Medical Oncology, Cantonal Hospital Baselland, Mühlemattstrasse 11, CH-4410 Liestal, Switzerland
| | - Gieri Cathomas
- Institute of Pathology, Cantonal Hospital Baselland, Mühlemattstrasse 11, CH-4410 Liestal, Switzerland
| | - Alfred Zippelius
- Division of Medical Oncology, University Hospital Basel, Petersgraben 4, CH-4031 Basel, Switzerland
| | - Kirsten D Mertz
- Institute of Pathology, Cantonal Hospital Baselland, Mühlemattstrasse 11, CH-4410 Liestal, Switzerland
| |
Collapse
|
11
|
Gerbino A, Debellis L, Caroppo R, Curci S, Colella M. Cadmium inhibits acid secretion in stimulated frog gastric mucosa. Toxicol Appl Pharmacol 2010; 245:264-71. [DOI: 10.1016/j.taap.2010.03.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2010] [Revised: 03/12/2010] [Accepted: 03/15/2010] [Indexed: 12/12/2022]
|
12
|
Kaunitz JD, Akiba Y. Duodenal Carbonic Anhydrase: Mucosal Protection, Luminal Chemosensing, and Gastric Acid Disposal. Keio J Med 2006; 55:96-106. [PMID: 17008801 DOI: 10.2302/kjm.55.96] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The duodenum serves as a buffer zone between the stomach and jejunum. Over a length of only 25 cm, large volumes of strong acid secreted by the stomach must be converted to the neutral-alkaline chyme of the hindgut lumen, generating large volumes of CO2, which the duodenum then absorbs. The duodenal mucosa consists of epithelial cells connected by low-resistance tight junctions, forming a leaky epithelial barrier. Despite this high permeability, the epithelial cells, under intense stress from luminal mineral acid and highly elevated P(CO2), maintain normal functioning. Furthermore, the duodenum plays an active role in foregut acid-base homeostasis, absorbing large amounts of H+ and CO2 that are recycled by the gastric parietal cells. Prompted by the high expression of cytosolic and membrane carbonic anhydrase (CAs) in duodenal epithelial cells, and the intriguing observation that CA activity appears to augment cellular acid stress, we formulated a novel hypothesis regarding the role of CA in duodenal acid absorption, epithelial protection, and chemosensing. In this review, we will describe how luminal CO2/H+ traverses the duodenal epithelial cell brush border membrane, acidifies the cytoplasm, and is sensed in the subepithelium.
Collapse
Affiliation(s)
- Jonathan D Kaunitz
- Greater Los Angeles Veterans Affairs Healthcare System, Los Angeles, CA, USA.
| | | |
Collapse
|
13
|
Caroppo R, Gerbino A, Fistetto G, Colella M, Debellis L, Hofer AM, Curci S. Extracellular calcium acts as a "third messenger" to regulate enzyme and alkaline secretion. ACTA ACUST UNITED AC 2004; 166:111-9. [PMID: 15240573 PMCID: PMC2172151 DOI: 10.1083/jcb.200310145] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
It is generally assumed that the functional consequences of stimulation with Ca2+-mobilizing agonists are derived exclusively from the second messenger action of intracellular Ca2+, acting on targets inside the cells. However, during Ca2+ signaling events, Ca2+ moves in and out of the cell, causing changes not only in intracellular Ca2+, but also in local extracellular Ca2+. The fact that numerous cell types possess an extracellular Ca2+ “sensor” raises the question of whether these dynamic changes in external [Ca2+] may serve some sort of messenger function. We found that in intact gastric mucosa, the changes in extracellular [Ca2+] secondary to carbachol-induced increases in intracellular [Ca2+] were sufficient and necessary to elicit alkaline secretion and pepsinogen secretion, independent of intracellular [Ca2+] changes. These findings suggest that extracellular Ca2+ can act as a “third messenger” via Ca2+ sensor(s) to regulate specific subsets of tissue function previously assumed to be under the direct control of intracellular Ca2+.
Collapse
Affiliation(s)
- Rosa Caroppo
- Dipartimento di Fisiologia Generale ed Ambientale, Università di Bari, Italy
| | | | | | | | | | | | | |
Collapse
|
14
|
Caroppo R, Gerbino A, Debellis L, Kifor O, Soybel DI, Brown EM, Hofer AM, Curci S. Asymmetrical, agonist-induced fluctuations in local extracellular [Ca(2+)] in intact polarized epithelia. EMBO J 2001; 20:6316-26. [PMID: 11707403 PMCID: PMC125728 DOI: 10.1093/emboj/20.22.6316] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
We recently proposed that extracellular Ca(2+) ions participate in a novel form of intercellular communication involving the extracellular Ca(2+)-sensing receptor (CaR). Here, using Ca(2+)-selective microelectrodes, we directly measured the profile of agonist-induced [Ca(2+)]ext changes in restricted domains near the basolateral or luminal membranes of polarized gastric acid-secreting cells. The Ca(2+)-mobilizing agonist carbachol elicited a transient, La(3+)-sensitive decrease in basolateral [Ca(2+)] (average approximately 250 microM, but as large as 530 microM). Conversely, carbachol evoked an HgCl2-sensitive increase in [Ca(2+)] (average approximately 400 microM, but as large as 520 microM) in the lumen of single gastric glands. Both responses were significantly reduced by pre-treatment with sarco-endoplasmic reticulum Ca(2+) ATPase (SERCA) pump inhibitors or with the intracellular Ca(2+) chelator BAPTA-AM. Immunofluorescence experiments demonstrated an asymmetric localization of plasma membrane Ca(2+) ATPase (PMCA), which appeared to be partially co-localized with CaR and the gastric H(+)/K(+)-ATPase in the apical membrane of the acid-secreting cells. Our data indicate that agonist stimulation results in local fluctuations in [Ca(2+)]ext that would be sufficient to modulate the activity of the CaR on neighboring cells.
Collapse
Affiliation(s)
| | | | | | - Olga Kifor
- Dipartimento di Fisiologia Generale ed Ambientale, Università di Bari, Via Amendola 165/A, 70126 Bari, Italy,
Endocrine Hypertension Division, Membrane Biology Program, Department of Medicine and Department of Surgery, Brigham and Women’s Hospital and Boston VA Healthcare System, Harvard Medical School, Boston and West Roxbury, 1400 VFW Parkway, West Roxbury, MA 02132, USA Corresponding author e-mail:
| | - David I. Soybel
- Dipartimento di Fisiologia Generale ed Ambientale, Università di Bari, Via Amendola 165/A, 70126 Bari, Italy,
Endocrine Hypertension Division, Membrane Biology Program, Department of Medicine and Department of Surgery, Brigham and Women’s Hospital and Boston VA Healthcare System, Harvard Medical School, Boston and West Roxbury, 1400 VFW Parkway, West Roxbury, MA 02132, USA Corresponding author e-mail:
| | - Edward M. Brown
- Dipartimento di Fisiologia Generale ed Ambientale, Università di Bari, Via Amendola 165/A, 70126 Bari, Italy,
Endocrine Hypertension Division, Membrane Biology Program, Department of Medicine and Department of Surgery, Brigham and Women’s Hospital and Boston VA Healthcare System, Harvard Medical School, Boston and West Roxbury, 1400 VFW Parkway, West Roxbury, MA 02132, USA Corresponding author e-mail:
| | - Aldebaran M. Hofer
- Dipartimento di Fisiologia Generale ed Ambientale, Università di Bari, Via Amendola 165/A, 70126 Bari, Italy,
Endocrine Hypertension Division, Membrane Biology Program, Department of Medicine and Department of Surgery, Brigham and Women’s Hospital and Boston VA Healthcare System, Harvard Medical School, Boston and West Roxbury, 1400 VFW Parkway, West Roxbury, MA 02132, USA Corresponding author e-mail:
| | - Silvana Curci
- Dipartimento di Fisiologia Generale ed Ambientale, Università di Bari, Via Amendola 165/A, 70126 Bari, Italy,
Endocrine Hypertension Division, Membrane Biology Program, Department of Medicine and Department of Surgery, Brigham and Women’s Hospital and Boston VA Healthcare System, Harvard Medical School, Boston and West Roxbury, 1400 VFW Parkway, West Roxbury, MA 02132, USA Corresponding author e-mail:
| |
Collapse
|
15
|
Busk M, Jensen FB, Wang T. Effects of feeding on metabolism, gas transport, and acid-base balance in the bullfrog Rana catesbeiana. Am J Physiol Regul Integr Comp Physiol 2000; 278:R185-95. [PMID: 10644638 DOI: 10.1152/ajpregu.2000.278.1.r185] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Massive feeding in ectothermic vertebrates causes changes in metabolism and acid-base and respiratory parameters. Most investigations have focused on only one aspect of these complex changes, and different species have been used, making comparison among studies difficult. The purpose of the present study was, therefore, to provide an integrative study of the multiple physiological changes taking place after feeding. Bullfrogs (Rana catesbeiana) partly submerged in water were fed meals (mice or rats) amounting to approximately (1)/(10) of their body weight. Oxygen consumption increased and peaked at a value three times the predigestive level 72-96 h after feeding. Arterial PO(2) decreased slightly during digestion, whereas hemoglobin-bound oxygen saturation was unaffected. Yet, arterial blood oxygen content was pronouncedly elevated because of a 60% increase in hematocrit, which appeared mediated via release of red blood cells from the spleen. Gastric acid secretion was associated with a 60% increase in plasma HCO3(-) concentration ([HCO3(-)]) 48 h after feeding. Arterial pH only increased from 7.86 to 7.94, because the metabolic alkalosis was countered by an increase in PCO(2) from 10.8 to 13.7 mm Hg. Feeding also induced a small intracellular alkalosis in the sartorius muscle. Arterial pH and HCO3(-) returned to control values 96-120 h after feeding. There was no sign of anaerobic energy production during digestion as plasma and tissue lactate levels remained low and intracellular ATP concentration stayed high. However, phosphocreatine was reduced in the sartorius muscle and ventricle 48 h after feeding.
Collapse
Affiliation(s)
- M Busk
- Centre for Respiratory Adaptation, Institute of Biology, University of Southern Denmark, Denmark.
| | | | | |
Collapse
|
16
|
Demarest JR, Machen TE. Electrophysiology of Gastric Ion Transport. Compr Physiol 1989. [DOI: 10.1002/cphy.cp060310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
17
|
Kainer G, Chan JC. Hypocalcemic and hypercalcemic disorders in children. CURRENT PROBLEMS IN PEDIATRICS 1989; 19:489-545. [PMID: 2686942 DOI: 10.1016/0045-9380(89)90031-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- G Kainer
- Prince of Wales Children's Hospital Liverpool, New South Wales, Australia
| | | |
Collapse
|
18
|
Abstract
The gastric mucosal barrier is that property which defends against acid and which impedes diffusion of acid from the lumen into the mucosa. The disappearance of luminal H+ is linearly related to luminal (H+) both in the normal stomach and in stomachs exposed to barrier breakers. The latter invaribaly produce anatomic evidence of surface cellular injury. Strong direct evidence for back diffusion of luminal H+ derives from the recent demonstration of a highly significant correlation between the disappearance of luminal H+ and the pH of the lamina propria measured by an implanted microelectrode. The permeabilities of the antrum and fundus to H+ differ from each other in the same species and in different species. Gastric ulceration does not occur in the absence of luminal acid and is not dependent upon the absolute loss of H+ from the luminal solution. Mucosal ischemia induced by hemorrhage reduces tolerance against ulceration as does inhibition of acid secretion, acidification of the tissue caused by absence of nutrient bicarbonate, inhibition of carbonic anhydrase, and blockade of anion exchange by SITS. A tentative schema is proposed by which defense against luminal acid is accomplished in gastric mucosa.
Collapse
|
19
|
|
20
|
Chacín J, Rincón R, Inciarte D, Cańizales A, Martínez G, Alonso D. Effect of Krebs cycle intermediates and inhibitors on toad gastric mucosa. Am J Physiol Endocrinol Metab 1979; 236:E692-700. [PMID: 35985 DOI: 10.1152/ajpendo.1979.236.6.e692] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
An attempt to increase the permeability of gastric mucosa to exogenous Krebs cycle intermediates seemed advisable for a better understanding their relationship with acid secretion. At pH 7.4, citrate, oxoglutarate, fumarate, and malate had no significant effect on oxygen uptake (QO2) nor on acid secretion (QH+) by toad gastric mucosa; succinate increased QO2 slightly and had no effect on QH+; but at pH 5.0, oxoglutarate and succinate increased QO2 by 18 and 21%, respectively. 14CO2 evolved by gastric mucosa incubated with [14C]oxoglutarate, succinate, malate, or citrate was 155, 92, 128, and 353%, respectively, greater at pH 5. Citrate, oxoglutarate, succinate, fumarate, and malate increased QH+ by theophylline-stimulated mucosa at pH 5.0 by 25, 39, 35, 17 and 28%, respectively. Oxoglutarate-dependent respiration was shown to correlate with oxoglutarate oxidation. Malonate and arsenite inhibited QO2 and QH+; malonate inhibition was reversed by washout or by succinate. Arsenite was reversed by washout and accelerated by addition of lipoate immediately after washout. The results suggest that the Krebs cycle has concomitant roles in the regulation of QH+ and oxidative metabolism in the toad gastric mucosa.
Collapse
|
21
|
|