1
|
Protective effects of apelin on gastric mucosa. Tissue Cell 2022; 78:101885. [DOI: 10.1016/j.tice.2022.101885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/29/2022] [Accepted: 08/01/2022] [Indexed: 11/18/2022]
|
2
|
Puri P, Grimmett G, Faraj R, Gibson L, Gilbreath E, Yoder BK. Elevated Protein Kinase A Activity in Stomach Mesenchyme Disrupts Mesenchymal-epithelial Crosstalk and Induces Preneoplasia. Cell Mol Gastroenterol Hepatol 2022; 14:643-668.e1. [PMID: 35690337 PMCID: PMC9421585 DOI: 10.1016/j.jcmgh.2022.06.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 05/31/2022] [Accepted: 06/01/2022] [Indexed: 12/11/2022]
Abstract
BACKGROUND & AIMS Mesenchymal-epithelial crosstalk (MEC) in the stomach is executed by pathways such as bone morphogenetic protein (BMP) and extracellular signal-regulated kinase (ERK). Mis-regulation of MEC disrupts gastric homeostasis and causes tumorigenesis. Protein Kinase A (PKA) crosstalks with BMP and ERK signaling; however, PKA function(s) in stomach development and homeostasis remains undefined. METHODS We generated a novel Six2-Cre+/-PKAcαRfl/wt (CA-PKA) mouse in which expression of constitutive-active PKAcαR was induced in gastric mesenchyme progenitors. Lineage tracing determined spatiotemporal activity of Six2-Cre in the stomach. For phenotyping CA-PKA mice histological, co-immunofluorescence, immunoblotting, mRNA sequencing, and bioinformatics analyses were performed. RESULTS Lineage tracing showed that Six2-Cre activity in the stomach is restricted to the mesenchymal compartment. CA-PKA mice showed disruption of gastric homeostasis characterized by aberrant mucosal development and epithelial hyperproliferation; ultimately developing multiple features of gastric corpus preneoplasia including decreased parietal cells, mucous cell hyperplasia, spasmolytic peptide expressing metaplasia with intestinal characteristics, and dysplastic and invasive cystic glands. Furthermore, mutant corpus showed marked chronic inflammation characterized by infiltration of lymphocytes and myeloid-derived suppressor cells along with the upregulation of innate and adaptive immune system components. Striking upregulation of inflammatory mediators and STAT3 activation was observed. Mechanistically, we determined there is an activation of ERK1/2 and downregulation of BMP/SMAD signaling characterized by marked upregulation of BMP inhibitor gremlin 1. CONCLUSIONS We report a novel role of PKA signaling in gastric MEC execution and show that PKA activation in the gastric mesenchyme drives preneoplasia by creating a proinflammatory and proproliferative microenvironment associated with the downregulation of BMP/SMAD signaling and activation of ERK1/2.
Collapse
Affiliation(s)
- Pawan Puri
- Department of Biomedical Sciences, Tuskegee University College of Veterinary Medicine, Tuskegee, Alabama,Correspondence Address correspondence to: Pawan Puri, DVM, PhD, Department of Biomedical Sciences, Tuskegee University College of Veterinary Medicine, A310 Patterson Hall, Tuskegee, AL 36088; tel. (334) 724-4486; fax: (334) 727-8177.
| | - Garfield Grimmett
- Department of Biomedical Sciences, Tuskegee University College of Veterinary Medicine, Tuskegee, Alabama
| | - Rawah Faraj
- Department of Biomedical Sciences, Tuskegee University College of Veterinary Medicine, Tuskegee, Alabama
| | - Laurielle Gibson
- Department of Biomedical Sciences, Tuskegee University College of Veterinary Medicine, Tuskegee, Alabama
| | - Ebony Gilbreath
- Department of Pathobiology, College of Veterinary Medicine, Tuskegee University, Tuskegee, Alabama
| | - Bradley K. Yoder
- Department of Cell, Developmental, and Integrative Biology, Heersink School of Medicine, University of Alabama, Birmingham, Alabama
| |
Collapse
|
3
|
Gulumsek E, Sumbul HE, Yesildal F, Kizildag C, Ozturk DD, Avci BS, Aktas B, Avci A, Bayrak E, Tas A, Kara B. Serum Elabela level is related to endoscopic activity index in patients with active ulcerative colitis. Ir J Med Sci 2022; 191:1171-1176. [PMID: 35000117 DOI: 10.1007/s11845-021-02914-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 12/28/2021] [Indexed: 10/19/2022]
Abstract
BACKGROUND In ulcerative colitis patients, Elabela levels and the relation of Elabela with laboratory parameters is unknown. AIM The purpose of this study was to investigate the serum Elabela levels in UC patients and its relationship with other clinical and laboratory findings. METHODS Forty-three patients with UC and 40 healthy controls (group I) similar in age and gender were included in the study. Routine patient history, physical examination, and laboratory tests were followed by analysis of serum Elabela levels. Endoscopic activity index (EAI) of patients with UC was calculated. There were two groups of patients: those in remission (group II) and with active disease (group III). RESULTS Groups I, II, and III had 40, 22, and 21 participants, respectively. Serum Elabela levels were found to be 3.32 ± 1.25 ng/mL in group I, 3.38 ± 0.88 ng/mL in group II, and 5.48 ± 1.61 ng/mL in group III. Comparing the serum Elabela levels, a statistically significant difference was found between three groups (p < 0.001). Serum Elabela level showed a significant and positive correlation with EAI, leukocyte count, and hs-CRP, while a negative correlation was found with hemoglobin levels in univariate analysis (p < 0.001, for each). In linear regression analysis, these parameters were found to be associated with EAI and hs-CRP (p = 0.049, β = 0.337, and p = 0.015, β = 0.396, respectively). CONCLUSION Elabela concentrations in patients with active UC was significantly higher and was associated with EAI and hs-CRP. Blood Elabela concentrations can be useful in the diagnosis and follow-up of patients with active UC.
Collapse
Affiliation(s)
- Erdinc Gulumsek
- Department of Gastroenterology, University of Health Sciences - Adana Health Practice and Research Center, Adana, Turkey
| | - Hilmi Erdem Sumbul
- Department of Internal Medicine, University of Health Sciences - Adana Health Practice and Research Center, Dr. Mithat Özsan Bulvarı Kışla Mah. 4522 Sok. No: 1 Yüreğir, Adana, Turkey.
| | - Fatih Yesildal
- Department of Medical Biochemistry, Suleyman Yalcin City Hospital, Goztepe Prof. Dr, Istanbul, Turkey
| | - Cisem Kizildag
- Department of Internal Medicine, University of Health Sciences - Adana Health Practice and Research Center, Dr. Mithat Özsan Bulvarı Kışla Mah. 4522 Sok. No: 1 Yüreğir, Adana, Turkey
| | - Dilan Damla Ozturk
- Department of Internal Medicine, University of Health Sciences - Adana Health Practice and Research Center, Dr. Mithat Özsan Bulvarı Kışla Mah. 4522 Sok. No: 1 Yüreğir, Adana, Turkey
| | - Begum Seyda Avci
- Department of Internal Medicine, University of Health Sciences - Adana Health Practice and Research Center, Dr. Mithat Özsan Bulvarı Kışla Mah. 4522 Sok. No: 1 Yüreğir, Adana, Turkey
| | - Beytullah Aktas
- Department of Internal Medicine, University of Health Sciences - Adana Health Practice and Research Center, Dr. Mithat Özsan Bulvarı Kışla Mah. 4522 Sok. No: 1 Yüreğir, Adana, Turkey
| | - Akkan Avci
- Department of Emergency Medicine, University of Health Sciences - Adana Health Practice and Research Center, Adana, Turkey
| | - Edip Bayrak
- Department of Infectious Disease, University of Health Sciences - Adana Health Practice and Research Center, Adana, Turkey
| | - Adnan Tas
- Department of Gastroenterology, University of Health Sciences - Adana Health Practice and Research Center, Adana, Turkey
| | - Banu Kara
- Department of Gastroenterology, University of Health Sciences - Adana Health Practice and Research Center, Adana, Turkey
| |
Collapse
|
4
|
Palmioli E, Dall’Aglio C, Bellesi M, Tardella FM, Moscatelli S, Scocco P, Mercati F. The Apelinergic System Immuno-Detection in the Abomasum and Duodenum of Sheep Grazing on Semi-Natural Pasture. Animals (Basel) 2021; 11:ani11113173. [PMID: 34827905 PMCID: PMC8614516 DOI: 10.3390/ani11113173] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 11/01/2021] [Accepted: 11/04/2021] [Indexed: 12/16/2022] Open
Abstract
Simple Summary The semi-natural pastures in the Apennines represent the feed source for ovine, whose grazing activity helps to preserve the grassland’s biodiversity. Summer drought stress decreases the grassland pastoral value and affects the morpho-functional features of sheep’s digestive systems. A better knowledge of the gastrointestinal system of sheep may contribute to guaranteeing their welfare, a prerequisite for the sustainability of livestock production. This study aimed to immune-localize the apelinergic system in the abomasum and duodenum of sheep grazing on semi-natural pasture during the spring–summer season and to compare its behavior among animal groups fed with or without supplementation. The apelinergic system, composed of apelin and its receptor, is involved in foodintake and the secretion and absorption activities of the digestive apparatus. Apelinergic system molecules were localized at the abomasum lining epithelium and fundic glands level and at the duodenum lining and crypt epithelium, in addition to the neuroendocrine cells. Variations in reactivity were observed in the different feed groups; feed supplementation seemed to maintain the functionality of the apelinergic system in the organs near the status related to the better pasture phase, suggesting that it may be a suitable solution able to counteract the harmful effects of summer drought stress. Abstract Apelin (APLN) is an adipokine mainly produced by adipose tissue and related to an individual’s nutritional status as well as digestive apparatus functions. In this work, APLN and its receptor (APLNR) were investigated, by immunohistochemistry, in the abomasum and duodenum of 15 Comisana × Appenninica adult sheep reared in a semi-natural pasture. Organ samples were collected after maximum pasture flowering (M × F group) and after maximum pasture dryness (M × D group); the experimental group (E × p group) received a feed supplementation of 600 grams/day/head of barley and corn in addition to M × D group feeding. APLN and APLNR were identified in the lining epithelium and the fundic gland chief cells of the abomasum. APLNR was observed in the lining epithelium, in the crypts and the serotonin secreting cells of the duodenum. Similar reactivity was observed between the M × F and E × p groups, while the M × D group showed a lower intensity of immunostaining for both APLN and APLNR in all positive structures but the duodenal serotonin neuroendocrine cells. Hence, our findings show that the E × p group presents a picture quite overlapped with M × F and suggest that food supplementation has a maintaining effect on the apelinergic system expression in the investigated digestive tracts of the sheep.
Collapse
Affiliation(s)
- Elisa Palmioli
- Department of FISSUF, PhD Course in “Ethics of Communication, Scientific Research and Technological Innovation” Medical-Health Curriculum, University of Perugia, Piazza G. Ermini, 1, 06123 Perugia, Italy;
- Department of Veterinary Medicine, University of Perugia, Via San Costanzo 4, 06126 Perugia, Italy;
| | - Cecilia Dall’Aglio
- Department of Veterinary Medicine, University of Perugia, Via San Costanzo 4, 06126 Perugia, Italy;
- Correspondence: ; Tel.: +39-0755857633
| | - Michele Bellesi
- School of Biosciences and Veterinary Medicine, University of Camerino, Via Pontoni 5, 62032 Camerino, Italy; (M.B.); (F.M.T.); (S.M.); (P.S.)
| | - Federico Maria Tardella
- School of Biosciences and Veterinary Medicine, University of Camerino, Via Pontoni 5, 62032 Camerino, Italy; (M.B.); (F.M.T.); (S.M.); (P.S.)
| | - Sara Moscatelli
- School of Biosciences and Veterinary Medicine, University of Camerino, Via Pontoni 5, 62032 Camerino, Italy; (M.B.); (F.M.T.); (S.M.); (P.S.)
| | - Paola Scocco
- School of Biosciences and Veterinary Medicine, University of Camerino, Via Pontoni 5, 62032 Camerino, Italy; (M.B.); (F.M.T.); (S.M.); (P.S.)
| | - Francesca Mercati
- Department of Veterinary Medicine, University of Perugia, Via San Costanzo 4, 06126 Perugia, Italy;
| |
Collapse
|
5
|
Marousez L, Hanssens S, Butruille L, Petit C, Pourpe C, Besengez C, Rakza T, Storme L, Deruelle P, Lesage J, Eberlé D. Breast milk apelin level increases with maternal obesity and high-fat feeding during lactation. Int J Obes (Lond) 2021; 45:1052-1060. [PMID: 33594258 DOI: 10.1038/s41366-021-00772-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 12/14/2020] [Accepted: 01/21/2021] [Indexed: 01/31/2023]
Abstract
OBJECTIVE Recent evidence indicates that levels of breast milk (BM) hormones such as leptin can fluctuate with maternal adiposity, suggesting that BM hormones may signal maternal metabolic and nutritional environments to offspring during postnatal development. The hormone apelin is highly abundant in BM but its regulation during lactation is completely unknown. Here, we evaluated whether maternal obesity and overnutrition impacted BM apelin and leptin levels in clinical cohorts and lactating rats. METHODS BM and plasma samples were collected from normal-weight and obese breastfeeding women, and from lactating rats fed a control or a high fat (HF) diet during lactation. Apelin and leptin levels were assayed by ELISA. Mammary gland (MG) apelin expression and its cellular localization in lactating rats was measured by quantitative RT-PCR and immunofluorescence, respectively. RESULTS BM apelin levels increased with maternal BMI, whereas plasma apelin levels decreased. BM apelin was also positively correlated with maternal insulin and C-peptide levels. In rats, maternal HF feeding exclusively during lactation was sufficient to increase BM apelin levels and decrease its plasma concentration without changing body weight. In contrast, BM leptin levels increased with maternal BMI in humans, but did not change with maternal HF feeding during lactation in rats. Apelin is highly expressed in the rat MG during lactation and was mainly localized to mammary myoepithelial cells. We found that MG apelin gene expression was up-regulated by maternal HF diet and positively correlated with BM apelin content and maternal insulinemia. CONCLUSIONS Our study indicates that BM apelin levels increase with long- and short-term overnutrition, possibly via maternal hyperinsulinemia and transcriptional upregulation of MG apelin expression in myoepithelial cells. Apelin regulates many physiological processes, including energy metabolism, digestive function, and development. Further studies are needed to unravel the consequences of such changes in offspring development.
Collapse
Affiliation(s)
- Lucie Marousez
- Univ. Lille, EA4489 Environnement Périnatal et Santé, Lille, France.,Univ. Lille, Inserm, CHU Lille, U1286 - INFINITE - Institute for Translational Research in Inflammation, Lille, France
| | - Sandy Hanssens
- Univ. Lille, EA4489 Environnement Périnatal et Santé, Lille, France.,CHU Lille, Jeanne de Flandre Hospital, Gynecology-Obstetrics, Lille, France
| | - Laura Butruille
- Univ. Lille, EA4489 Environnement Périnatal et Santé, Lille, France.,Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, Lille, France
| | - Céline Petit
- CHU Lille, Jeanne de Flandre Hospital, Gynecology-Obstetrics, Lille, France
| | - Charlène Pourpe
- Univ. Lille, EA4489 Environnement Périnatal et Santé, Lille, France.,Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, Lille, France
| | | | - Thameur Rakza
- Univ. Lille, EA4489 Environnement Périnatal et Santé, Lille, France.,CHU Lille, Jeanne de Flandre Hospital, Neonatology and Pediatrics, Lille, France
| | - Laurent Storme
- Univ. Lille, EA4489 Environnement Périnatal et Santé, Lille, France.,CHU Lille, Jeanne de Flandre Hospital, Neonatology and Pediatrics, Lille, France
| | - Philippe Deruelle
- Univ. Lille, EA4489 Environnement Périnatal et Santé, Lille, France.,CHU Lille, Jeanne de Flandre Hospital, Gynecology-Obstetrics, Lille, France
| | - Jean Lesage
- Univ. Lille, EA4489 Environnement Périnatal et Santé, Lille, France.,Univ. Lille, Inserm, CHU Lille, U1286 - INFINITE - Institute for Translational Research in Inflammation, Lille, France
| | - Delphine Eberlé
- Univ. Lille, EA4489 Environnement Périnatal et Santé, Lille, France. .,Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1011-EGID, Lille, France.
| |
Collapse
|
6
|
Apelin Receptor Signaling During Mesoderm Development. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020. [PMID: 32648246 DOI: 10.1007/5584_2020_567] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
The Apelin receptor (Aplnr) is a G-protein coupled receptor which has a wide body distribution and various physiological roles including homeostasis, angiogenesis, cardiovascular and neuroendocrine function. Apelin and Elabela are two peptide components of the Aplnr signaling and are cleaved to give different isoforms which are active in different tissues and organisms.Aplnr signaling is related to several pathologies including obesity, heart disases and cancer in the adult body. However, the developmental role in mammalian embryogenesis is crucial for migration of early cardiac progenitors and cardiac function. Aplnr and peptide components have a role in proliferation, differentiation and movement of endodermal precursors. Although expression of Aplnr signaling is observed in endodermal lineages, the main function is the control of mesoderm cell movement and cardiac development. Mutant of the Aplnr signaling components results in the malformations, defects and lethality mainly due to the deformed heart function. This developmental role share similarity with the cardiovascular functions in the adult body.Determination of Aplnr signaling and underlying mechanisms during mammalian development might enable understanding of regulatory molecular mechanisms which not only control embryonic development process but also control tissue function and disease pathology in the adult body.
Collapse
|
7
|
Engevik AC, Kaji I, Goldenring JR. The Physiology of the Gastric Parietal Cell. Physiol Rev 2020; 100:573-602. [PMID: 31670611 PMCID: PMC7327232 DOI: 10.1152/physrev.00016.2019] [Citation(s) in RCA: 101] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 10/10/2019] [Accepted: 10/13/2019] [Indexed: 12/11/2022] Open
Abstract
Parietal cells are responsible for gastric acid secretion, which aids in the digestion of food, absorption of minerals, and control of harmful bacteria. However, a fine balance of activators and inhibitors of parietal cell-mediated acid secretion is required to ensure proper digestion of food, while preventing damage to the gastric and duodenal mucosa. As a result, parietal cell secretion is highly regulated through numerous mechanisms including the vagus nerve, gastrin, histamine, ghrelin, somatostatin, glucagon-like peptide 1, and other agonists and antagonists. The tight regulation of parietal cells ensures the proper secretion of HCl. The H+-K+-ATPase enzyme expressed in parietal cells regulates the exchange of cytoplasmic H+ for extracellular K+. The H+ secreted into the gastric lumen by the H+-K+-ATPase combines with luminal Cl- to form gastric acid, HCl. Inhibition of the H+-K+-ATPase is the most efficacious method of preventing harmful gastric acid secretion. Proton pump inhibitors and potassium competitive acid blockers are widely used therapeutically to inhibit acid secretion. Stimulated delivery of the H+-K+-ATPase to the parietal cell apical surface requires the fusion of intracellular tubulovesicles with the overlying secretory canaliculus, a process that represents the most prominent example of apical membrane recycling. In addition to their unique ability to secrete gastric acid, parietal cells also play an important role in gastric mucosal homeostasis through the secretion of multiple growth factor molecules. The gastric parietal cell therefore plays multiple roles in gastric secretion and protection as well as coordination of physiological repair.
Collapse
Affiliation(s)
- Amy C Engevik
- Departments of Surgery and of Cell and Developmental Biology and the Epithelial Biology Center, Vanderbilt University School of Medicine, Vanderbilt University Medical Center and the Nashville VA Medical Center, Nashville, Tennessee
| | - Izumi Kaji
- Departments of Surgery and of Cell and Developmental Biology and the Epithelial Biology Center, Vanderbilt University School of Medicine, Vanderbilt University Medical Center and the Nashville VA Medical Center, Nashville, Tennessee
| | - James R Goldenring
- Departments of Surgery and of Cell and Developmental Biology and the Epithelial Biology Center, Vanderbilt University School of Medicine, Vanderbilt University Medical Center and the Nashville VA Medical Center, Nashville, Tennessee
| |
Collapse
|
8
|
Xu P, Gildea JJ, Zhang C, Konkalmatt P, Cuevas S, Bigler Wang D, Tran HT, Jose PA, Felder RA. Stomach gastrin is regulated by sodium via PPAR-α and dopamine D1 receptor. J Mol Endocrinol 2020; 64:53-65. [PMID: 31794424 PMCID: PMC7654719 DOI: 10.1530/jme-19-0053] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 12/03/2019] [Indexed: 12/14/2022]
Abstract
Gastrin, secreted by stomach G cells in response to ingested sodium, stimulates the renal cholecystokinin B receptor (CCKBR) to increase renal sodium excretion. It is not known how dietary sodium, independent of food, can increase gastrin secretion in human G cells. However, fenofibrate (FFB), a peroxisome proliferator-activated receptor-α (PPAR-α) agonist, increases gastrin secretion in rodents and several human gastrin-secreting cells, via a gastrin transcriptional promoter. We tested the following hypotheses: (1.) the sodium sensor in G cells plays a critical role in the sodium-mediated increase in gastrin expression/secretion, and (2.) dopamine, via the D1R and PPAR-α, is involved. Intact human stomach antrum and G cells were compared with human gastrin-secreting gastric and ovarian adenocarcinoma cells. When extra- or intracellular sodium was increased in human antrum, human G cells, and adenocarcinoma cells, gastrin mRNA and protein expression/secretion were increased. In human G cells, the PPAR-α agonist FFB increased gastrin protein expression that was blocked by GW6471, a PPAR-α antagonist, and LE300, a D1-like receptor antagonist. LE300 prevented the ability of FFB to increase gastrin protein expression in human G cells via the D1R, because the D5R, the other D1-like receptor, is not expressed in human G cells. Human G cells also express tyrosine hydroxylase and DOPA decarboxylase, enzymes needed to synthesize dopamine. G cells in the stomach may be the sodium sensor that stimulates gastrin secretion, which enables the kidney to eliminate acutely an oral sodium load. Dopamine, via the D1R, by interacting with PPAR-α, is involved in this process.
Collapse
Affiliation(s)
- Peng Xu
- Department of Pathology, The University of Virginia, Charlottesville, Virginia, USA
| | - John J Gildea
- Department of Pathology, The University of Virginia, Charlottesville, Virginia, USA
| | - Chi Zhang
- Department of Pathology, The University of Virginia, Charlottesville, Virginia, USA
| | - Prasad Konkalmatt
- Division of Renal Diseases & Hypertension, Department of Medicine, The George Washington University, School of Medicine & Health Sciences, Washington, District of Columbia, USA
| | - Santiago Cuevas
- Division of Renal Diseases & Hypertension, Department of Medicine, The George Washington University, School of Medicine & Health Sciences, Washington, District of Columbia, USA
| | - Dora Bigler Wang
- Department of Pathology, The University of Virginia, Charlottesville, Virginia, USA
| | - Hanh T Tran
- Department of Pathology, The University of Virginia, Charlottesville, Virginia, USA
| | - Pedro A Jose
- Division of Renal Diseases & Hypertension, Department of Medicine, The George Washington University, School of Medicine & Health Sciences, Washington, District of Columbia, USA
- Department of Pharmacology and Physiology, The George Washington University, School of Medicine & Health Sciences, Washington, District of Columbia, USA
| | - Robin A Felder
- Department of Pathology, The University of Virginia, Charlottesville, Virginia, USA
| |
Collapse
|
9
|
Atari E, Perry MC, Jose PA, Kumarasamy S. Regulated Endocrine-Specific Protein-18, an Emerging Endocrine Protein in Physiology: A Literature Review. Endocrinology 2019; 160:2093-2100. [PMID: 31294787 DOI: 10.1210/en.2019-00397] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 07/04/2019] [Indexed: 01/10/2023]
Abstract
Regulated endocrine-specific protein-18 (RESP18), a novel 18-kDa protein, was first identified in neuroendocrine tissue. Subsequent studies showed that Resp18 is expressed in the adrenal medulla, brain, pancreas, pituitary, retina, stomach, superior cervical ganglion, testis, and thyroid and also circulates in the plasma. Resp18 has partial homology with the islet cell antigen 512, also known as protein tyrosine phosphatase, receptor type N (PTPRN), but does not have phosphatase activity. Resp18 might serve as an intracellular signal; however, its function is unclear. It is regulated by dopamine, glucocorticoids, and insulin. We recently reported that the targeted disruption of the Resp18 locus in Dahl salt-sensitive rats increased their blood pressure and caused renal injury. The aim of the present review was to provide a comprehensive summary of the reported data currently available, especially the expression and proposed organ-specific function of Resp18.
Collapse
Affiliation(s)
- Ealla Atari
- Center for Hypertension and Precision Medicine, University of Toledo College of Medicine and Life Sciences, Toledo, Ohio
- Department of Physiology and Pharmacology, University of Toledo College of Medicine and Life Sciences, Toledo, Ohio
| | - Mitchel C Perry
- Center for Hypertension and Precision Medicine, University of Toledo College of Medicine and Life Sciences, Toledo, Ohio
- Department of Physiology and Pharmacology, University of Toledo College of Medicine and Life Sciences, Toledo, Ohio
| | - Pedro A Jose
- Division of Kidney Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine & Health Sciences, Washington, DC
- Department of Pharmacology and Physiology, The George Washington University School of Medicine & Health Sciences, Washington, DC
| | - Sivarajan Kumarasamy
- Center for Hypertension and Precision Medicine, University of Toledo College of Medicine and Life Sciences, Toledo, Ohio
- Department of Physiology and Pharmacology, University of Toledo College of Medicine and Life Sciences, Toledo, Ohio
| |
Collapse
|
10
|
Apelin system detection in the reproductive apparatus of ewes grazing on semi-natural pasture. Theriogenology 2019; 139:156-166. [PMID: 31412301 DOI: 10.1016/j.theriogenology.2019.08.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 07/19/2019] [Accepted: 08/07/2019] [Indexed: 02/07/2023]
Abstract
Apelin (APLN) is an adipokine with pleiotropic effects involved in the regulation of metabolic, cardiovascular, immune, and electrolyte balance function. Recent studies demonstrated a pivotal role in the regulation of male and female reproduction. APLN and its receptor (APLNR) were found in the hypothalamic-pituitary-gonad axis tissues, regulating gonadotropin release and steroidogenesis. However, to date, there are no studies that describe APLN system in the reproductive apparatus of the sheep. The study was performed on 10 Comisana x Appenninica adult dry ewes reared in a semi-natural pasture. Organ samples were collected from five animals in the two pasture functional phases: after maximum pasture flowering (Group 1) and after maximum pasture dryness (Group 2). Experiments were devised to characterize the gene expression and protein localization of the APLN/APLNR system in ewe reproductive apparatus; in addition, the concentration of plasma APLN was evaluated during the trial. Through immunohistochemical analysis, a positive staining for APLN was observed in the large luteal cells, in the epithelial cell coat of the ampulla, in the uterus epithelial lining and in the uterine glands. APLNR was observed in the granulosa cells, in the large luteal cells, in the secreting cells of the ampulla, in the uterus epithelial lining and uterine glands. The transcripts for APLN and APLNR were evidenced in all organ tissues examined. The highest level of APLN mRNA was detected in the Group 2 ewes in the luteal phase of the ovarian cycle compared to Group 1 ewes in the anestrous one. The relative content of APLN transcript was respectively twofold higher in the ovary (P < 0.05) and uterus (P < 0.05) and threefold higher in the ampulla (P < 0.05) in the Group 2 vs Group 1. The same trend of APLN transcript was evaluated for APLNR mRNA in uterus (P < 0.05) and ovary (P < 0.05). No difference was evidenced between Group 1 and Group 2 for APLNR mRNA levels. The plasma APLN level was fairly constant during the trial period. In conclusion, the present data suggest that the apelinergic system is involved in the reproduction function of ewes, being differentially distributed and expressed in the organs of the reproductive apparatus of ewes; these variations could be related to the sexual cycle and to the cyclic activity of the reproductive apparatus.
Collapse
|
11
|
Chang HN, Yeh YC, Chueh HY, Pang JHS. The anti-angiogenic effect of tryptanthrin is mediated by the inhibition of apelin promoter activity and shortened mRNA half-life in human vascular endothelial cells. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2019; 58:152879. [PMID: 31005035 DOI: 10.1016/j.phymed.2019.152879] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 02/11/2019] [Accepted: 02/23/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND Anti-angiogenesis is an important strategy of psoriasis treatment, but the side effects of systemic agents remain difficult to overcome. Topical use of indigo naturalis ointment has been proved to improve the skin lesion of psoriasis effectively and safely and one of its major components, tryptanthrin, has been demonstrated to have anti-angiogenic effect. Apelin, which has been reported to act as an angiogenic factor that could stimulate the proliferation and migration of vascular endothelial cells and proved to be elevated in psoriasis patients, is a potential target of anti-angiogenic therapy. PURPOSE We aim to find out if tryptanthrin works on the apelin pathway and study its anti-angiogenic mechanism. STUDY DESIGN Human umbilical vein endothelial cells (HUVECs) were used as the in vitro model. METHODS The effect of tryptanthrin on the expression of apelin and its receptor, APJ, was examined. The mRNA stability, promoter activity, and bioactivity of apelin, were also investigated. Migration and tube formation assay were used to evaluate the relationship between tryptanthrin and apelin. PD98059 and wortmannin were used to study the role of ERK1/2 MAPK and PI3K in apelin signaling pathway. RESULTS We demonstrated that tryptanthrin could inhibit the expression of apelin, attenuated the stability of apelin mRNA, and significantly inhibited the apelin promoter activity. The addition of apelin-13 restored the suppression of tube formation and migration by tryptanthrin. Both PD98059 and wortmannin could down-regulate the apelin mRNA expression suggesting the important signaling role of ERK1/2 MAPK and PI3K in the gene expression of apelin. CONCLUSION The anti-angiogenic effect of tryptanthrin was mediated by down-regulating apelin gene expression through suppression of promoter activity and decrease of mRNA stability in human vascular endothelial cells.
Collapse
Affiliation(s)
- Hsin-Ning Chang
- Department of Traditional Chinese Medicine, Chang Gung Memorial Hospital, Keelung, Taiwan, ROC; Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Taoyuan, Taiwan, ROC
| | - Yuan-Chieh Yeh
- Department of Traditional Chinese Medicine, Chang Gung Memorial Hospital, Keelung, Taiwan, ROC; Program in Molecular Medicine, School of Life Sciences, National Yang Ming University, Taipei, Taiwan, ROC
| | - Ho-Yen Chueh
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Taoyuan, Taiwan, ROC
| | - Jong-Hwei S Pang
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Taoyuan, Taiwan, ROC; Department of Physical Medicine and Rehabilitation, Chang Gung Memorial Hospital, Taoyuan, Taiwan, ROC.
| |
Collapse
|
12
|
Müller T, Kalea AZ, Marquez A, Hsieh I, Haque S, Ye M, Wysocki J, Bader M, Batlle D. Apelinergic system in the kidney: implications for diabetic kidney disease. Physiol Rep 2018; 6:e13939. [PMID: 30548130 PMCID: PMC6288480 DOI: 10.14814/phy2.13939] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 11/08/2018] [Accepted: 11/09/2018] [Indexed: 12/19/2022] Open
Abstract
The bioactive peptides of the apelinergic system and its receptor APJ have been shown to play a protective role in experimental cardiovascular and diabetic kidney disease (DKD). Mechanisms of this renoprotective effect remain to be elucidated. In this study, we examined the localization of APJ within the normal kidney and its kidney expression in the db/db model of DKD. The effect of hyperglycemia and angiotensin II on APJ was examined in cultured podocytes. In the glomerulus, APJ colocalized with podocyte but not endothelial cell markers. In podocytes stimulated with Pyr1 Apelin-13, a change in the phosphorylation status of the signaling proteins, AKT, ERK, and p70S6K, was observed with an increase 15 min after stimulation. Apelin-13 decreased activity of Caspase-3 in podocytes after high glucose treatment reflecting an antiapoptotic effect of APJ stimulation. In podocytes, APJ mRNA was downregulated in high glucose, when compared to normal glucose conditions and exposure to angiotensin II led to a further significant decrease in APJ mRNA. APJ and preproapelin mRNA levels in kidneys from db/db mice were markedly decreased along with decreased tubular APJ protein by western blotting and immunostaining when compared to db/m controls. In conclusion, the apelinergic system is decreased in kidneys from db/db mice. Within the glomerulus, APJ is mainly localized in podocytes and in this cell type its activation by Apelin-13 abolishes the proapoptotic effect of high glucose, suggesting a potential therapeutic role of apelin and emerging agonists with extended half-life for therapy of DKD.
Collapse
Affiliation(s)
- Tilman Müller
- Department of MedicineDivision of Nephrology and HypertensionFeinberg School of MedicineNorthwestern UniversityChicagoIllinois
- Charité‐Universitätsmedizin BerlinBerlinGermany
| | - Anastasia Z. Kalea
- Department of MedicineDivision of Nephrology and HypertensionFeinberg School of MedicineNorthwestern UniversityChicagoIllinois
- Institute of Liver and Digestive HealthUniversity College LondonLondonUK
| | - Alonso Marquez
- Department of MedicineDivision of Nephrology and HypertensionFeinberg School of MedicineNorthwestern UniversityChicagoIllinois
| | - Ivy Hsieh
- Department of MedicineDivision of Nephrology and HypertensionFeinberg School of MedicineNorthwestern UniversityChicagoIllinois
| | - Syed Haque
- Department of MedicineDivision of Nephrology and HypertensionFeinberg School of MedicineNorthwestern UniversityChicagoIllinois
| | - Minghao Ye
- Department of MedicineDivision of Nephrology and HypertensionFeinberg School of MedicineNorthwestern UniversityChicagoIllinois
| | - Jan Wysocki
- Department of MedicineDivision of Nephrology and HypertensionFeinberg School of MedicineNorthwestern UniversityChicagoIllinois
| | - Michael Bader
- Charité‐Universitätsmedizin BerlinBerlinGermany
- Max Delbrück Center for Molecular MedicineBerlinGermany
- German Center for Cardiovascular Research (DZHK), partner site BerlinBerlinGermany
- Berlin Institute of Health (BIH)BerlinGermany
- University of LübeckLübeckGermany
| | - Daniel Batlle
- Department of MedicineDivision of Nephrology and HypertensionFeinberg School of MedicineNorthwestern UniversityChicagoIllinois
| |
Collapse
|
13
|
Mercati F, Maranesi M, Dall'Aglio C, Petrucci L, Pasquariello R, Tardella FM, De Felice E, Scocco P. Apelin System in Mammary Gland of Sheep Reared in Semi-Natural Pastures of the Central Apennines. Animals (Basel) 2018; 8:E223. [PMID: 30486490 PMCID: PMC6315652 DOI: 10.3390/ani8120223] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 11/20/2018] [Accepted: 11/24/2018] [Indexed: 01/04/2023] Open
Abstract
Sheep are the most bred species in the Central Italy Apennine using the natural pastures as a trophic resource and grazing activity is fundamental to maintain the grassland biodiversity: this goal can be reached only ensuring an economical sustainability to the farmers. This study aimed to investigate the apelin/apelin receptor system in ovine mammary gland and to evaluate the differences induced by food supplementation, in order to shed light on this system function. A flock of 15 Comisana x Appenninica adult dry ewes were free to graze from June until pasture maximum flowering (MxF). From this period to pasture maximum dryness (MxD), in addition to grazing, the experimental group (Exp) was supplemented with 600 g/day/head of cereals. Apelin and apelin receptor were assessed by Real-Time PCR and immunohistochemistry on the mammary glands of subjects pertaining to MxF, MxD and Exp groups. They were detected in alveolar and ductal epithelial cells. The pasture maximum flowering group showed significant differences in apelin expression compared with experimental and MxD groups. Apelin receptor expression significantly differed among the three groups. The reduced apelin receptor expression and immunoreactivity levels during parenchyma involution enables us to hypothesize that apelin receptor plays a modulating role in the system control.
Collapse
Affiliation(s)
- Francesca Mercati
- Department of Veterinary Medicine, University of Perugia, Via San Costanzo 4, 06126 Perugia, Italy.
| | - Margherita Maranesi
- Department of Veterinary Medicine, University of Perugia, Via San Costanzo 4, 06126 Perugia, Italy.
| | - Cecilia Dall'Aglio
- Department of Veterinary Medicine, University of Perugia, Via San Costanzo 4, 06126 Perugia, Italy.
| | - Linda Petrucci
- Department of Veterinary Medicine, University of Perugia, Via San Costanzo 4, 06126 Perugia, Italy.
| | - Rolando Pasquariello
- Animal Reproduction and Biotechnology Laboratory, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, 1683 Campus delivery, Fort Collins, CO 80523, USA.
| | - Federico Maria Tardella
- School of Biosciences and Veterinary Medicine, University of Camerino, Via Pontoni 5, 62032 Camerino, Italy.
| | - Elena De Felice
- School of Biosciences and Veterinary Medicine, University of Camerino, Via Pontoni 5, 62032 Camerino, Italy.
| | - Paola Scocco
- School of Biosciences and Veterinary Medicine, University of Camerino, Via Pontoni 5, 62032 Camerino, Italy.
| |
Collapse
|
14
|
Huang Z, Luo X, Liu M, Chen L. Function and regulation of apelin/APJ system in digestive physiology and pathology. J Cell Physiol 2018; 234:7796-7810. [PMID: 30390294 DOI: 10.1002/jcp.27720] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 10/16/2018] [Indexed: 12/11/2022]
Abstract
Apelin is an endogenous ligand of seven-transmembrane G-protein-coupled receptor APJ. Apelin and APJ are distributed in various tissues, including the heart, lung, liver, kidney, and gastrointestinal tract and even in tumor tissues. Studies show that apelin messenger RNA is widely expressed in gastrointestinal (GI) tissues, including stomach and small intestine, which is closely correlated with GI function. Thus, the apelin/APJ system may exert a broad range of activities in the digestive system. In this paper, we review the role of the apelin/APJ system in the digestive system in physiological conditions, such as gastric acid secretion, control of appetite and food intake, cell proliferation, cholecystokinin secretion and histamine release, gut-brain axis, GI motility, and others. In pathological conditions, the apelin/APJ system plays an important role in the healing process of stress gastric injury, the clinical features and prognosis of patients with gastric cancers, the reduction of inflammatory response to enteritis and pancreatitis, the mediation of liver fibrogenesis, the promotion of liver damage, the inhibition of liver regeneration, the contribution of splanchnic neovascularization in portal hypertension, the treatment of colon cancer, and GI oxidative damage. Overall, the apelin/APJ system plays diversified functions and regulatory roles in digestive physiology and pathology. Further exploration of the relationship between the apelin/APJ system and the digestive system will help to find new and effective drugs for treating and alleviating the pain of digestive diseases.
Collapse
Affiliation(s)
- Zhen Huang
- Institute of Pharmacy and Pharmacology, Learning Key Laboratory for Pharmacoproteomics, University of South China, Hengyang, China.,Department of Pharmacy, The First Affiliated Hospital, University of South China, Hengyang, China
| | - Xuling Luo
- Institute of Pharmacy and Pharmacology, Learning Key Laboratory for Pharmacoproteomics, University of South China, Hengyang, China
| | - Meiqing Liu
- Institute of Pharmacy and Pharmacology, Learning Key Laboratory for Pharmacoproteomics, University of South China, Hengyang, China
| | - Linxi Chen
- Institute of Pharmacy and Pharmacology, Learning Key Laboratory for Pharmacoproteomics, University of South China, Hengyang, China
| |
Collapse
|
15
|
Li H, Kentish SJ, Wittert GA, Page AJ. Apelin modulates murine gastric vagal afferent mechanosensitivity. Physiol Behav 2018; 194:466-473. [DOI: 10.1016/j.physbeh.2018.06.039] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 06/06/2018] [Accepted: 06/27/2018] [Indexed: 12/16/2022]
|
16
|
Birsen İ, Gemici B, Acar N, Üstünel İ, İzgüt-Uysal VN. The role of apelin in the healing of water-immersion and restraint stress-induced gastric damage. J Physiol Sci 2017; 67:373-385. [PMID: 27369695 PMCID: PMC10717744 DOI: 10.1007/s12576-016-0469-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 06/22/2016] [Indexed: 12/14/2022]
Abstract
The objective of this study was to explore the role of apelin in the healing of gastric lesions induced by stress. Male Wistar rats were exposed to water immersion and restraint stress (WIRS) for 6 h with or without the apelin receptor antagonist F13A. The rats were killed on the 1st, 3rd, 5th or 10th day after the end of stress induction. Apelin and hypoxia-inducible factor-1α expression was increased on the 1st day after the end of stress exposure and was decreased daily thereafter. However, F13A retarded the healing of gastric lesions by preventing the improvement of mucosal blood flow, prostaglandin E2 production and vascular endothelial growth factor expression in rats exposed to WIRS. Additionally, F13A increased the gastric 4-hydroxynonenol + malondialdehyde content on the 1st and 3rd days after the end of stress induction but did not affect the change in gastric mucosal nitric oxide levels. In conclusion, apelin may be a regulatory protein involved in the healing mechanism of stress-induced gastric damage.
Collapse
Affiliation(s)
- İlknur Birsen
- Department of Physiology, Faculty of Medicine, Akdeniz University, 07070, Antalya, Turkey
| | - Burcu Gemici
- Department of Physiology, Faculty of Medicine, Akdeniz University, 07070, Antalya, Turkey
| | - Nuray Acar
- Department of Histology and Embryology, Faculty of Medicine, Akdeniz University, 07070, Antalya, Turkey
| | - İsmail Üstünel
- Department of Histology and Embryology, Faculty of Medicine, Akdeniz University, 07070, Antalya, Turkey
| | - V Nimet İzgüt-Uysal
- Department of Physiology, Faculty of Medicine, Akdeniz University, 07070, Antalya, Turkey.
| |
Collapse
|
17
|
Antushevich H, Bierła J, Pawlina B, Kapica M, Krawczyńska A, Herman AP, Kato I, Kuwahara A, Zabielski R. Apelin's effects on young rat gastrointestinal tract maturation. Peptides 2015; 65:1-5. [PMID: 25629252 DOI: 10.1016/j.peptides.2014.11.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 11/06/2014] [Accepted: 11/08/2014] [Indexed: 12/21/2022]
Abstract
Apelin is considered an important gut regulatory peptide with potential physiological roles in gastrointestinal cytoprotection and regulation of food intake and drinking behavior. The aim of this study was to determine the effects of intraperitoneal or intragastric apelin administration on gastric and intestinal epithelial apoptosis, mitosis and DNA repair enzyme 8-oxoguanine (OGG 1/2) expression in young Wistar rats (50±5 g b.wt.). Apelin-13 was intraperitoneally or intragastrically administered twice a day for 10 days (100 nmol/kg b.wt./2×day), and control groups received physiological saline as a placebo. The rats were sacrificed after treatment, and the gastric fundus, duodenum, middle jejunum and colon tissue samples were harvested for immunofluorescence studies. Intragastric administration of apelin-13 increased the apoptotic index in the stomach and colon tissues (P≤0.001) but decreased apoptosis in the duodenum and jejunum (P<0.001); this approach reduced the number of mitotic cells in the jejunum and colon but increased mitoses (P<0.001) in the duodenum. Finally, intragastric apelin-13 increased (P<0.001) OGG 1/2 enzyme expression in the stomach and jejunum and decreased its expression in the colon (P<0.01). However, intraperitoneal apelin-13 injection caused the opposite effect in the same regions of the gastrointestinal tract. In conclusion, apelin inhibits gastrointestinal tissue maturation in young rats, regardless of the administration route. However, further studies are required to clarify the mechanism of apelin action on gastrointestinal tract maturation in young rats.
Collapse
Affiliation(s)
- Hanna Antushevich
- The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Jablonna, Poland.
| | - Joanna Bierła
- Department of Physiology and Pathophysiology, Medical University of Warsaw, Faculty of Pharmacy, Warsaw, Poland; Pathology Children's Memorial Health Institute, Warsaw, Poland
| | - Bartosz Pawlina
- The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Jablonna, Poland
| | - Małgorzata Kapica
- Department of Animal Physiology, Faculty of Veterinary Medicine, University of Life Sciences in Lublin, Poland
| | - Agata Krawczyńska
- The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Jablonna, Poland
| | - Andrzej Przemysław Herman
- The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Jablonna, Poland
| | - Ikuo Kato
- Laboratory of Physiology, University of Shizuoka, Shizuoka, Japan
| | | | - Romuald Zabielski
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, Warsaw, Poland
| |
Collapse
|
18
|
Yu XH, Tang ZB, Liu LJ, Qian H, Tang SL, Zhang DW, Tian GP, Tang CK. Apelin and its receptor APJ in cardiovascular diseases. Clin Chim Acta 2014; 428:1-8. [DOI: 10.1016/j.cca.2013.09.001] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2013] [Revised: 08/31/2013] [Accepted: 09/01/2013] [Indexed: 12/29/2022]
|
19
|
Picault FX, Chaves-Almagro C, Projetti F, Prats H, Masri B, Audigier Y. Tumour co-expression of apelin and its receptor is the basis of an autocrine loop involved in the growth of colon adenocarcinomas. Eur J Cancer 2013; 50:663-74. [PMID: 24316062 DOI: 10.1016/j.ejca.2013.11.017] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 10/21/2013] [Accepted: 11/12/2013] [Indexed: 01/08/2023]
Abstract
Using a cancer profiling array, our laboratory has shown that apelin gene is up-regulated in half of colon adenocarcinomas. We have therefore postulated that apelin signalling might play a prominent role in the growth of colon tumours. We first confirmed by immunohistochemistry that apelin peptide is overexpressed in human colon adenomas and adenocarcinomas. We also observed a significant overexpression of apelin receptor (APJ) in adjacent sections. We then demonstrated that several colorectal cancer cell lines also expressed apelin and its receptor, the highest gene and peptide expression being detected in LoVo cells. In this cell line, the expression and functionality of apelin receptor were revealed by apelin-induced adenylyl cyclase inhibition and Akt phosphorylation. In addition, apelin clearly protected LoVo cells from apoptosis by inactivating a caspase-dependent pathway and decreasing the degradation of poly ADP ribose polymerase protein (PARP). Finally, treatment of these tumour cells by the (F13A)apelin13 receptor antagonist significantly reduced their proliferation rate. Altogether, these data suggest the existence of an autocrine loop by which constitutive activation of apelin signalling should participate in the growth of colon adenocarcinomas. Accordingly, apelin signalling is a promising pharmacological target for the treatment of human colon adenomas and adenocarcinomas.
Collapse
Affiliation(s)
- François-Xavier Picault
- Cancer Research Center of Toulouse, UMR 1037 INSERM - Université Toulouse III, CHU Rangueil, Bât L3, 1, Avenue Jean Poulhès, BP 84225, 31432 Toulouse, France
| | - Carline Chaves-Almagro
- Cancer Research Center of Toulouse, UMR 1037 INSERM - Université Toulouse III, CHU Rangueil, Bât L3, 1, Avenue Jean Poulhès, BP 84225, 31432 Toulouse, France
| | - Fabrice Projetti
- Center of Biological Resources, CHU Rangueil, Bât L2, 1, Avenue Jean Poulhès, BP 84225, 31432 Toulouse, France
| | - Hervé Prats
- Cancer Research Center of Toulouse, UMR 1037 INSERM - Université Toulouse III, CHU Rangueil, Bât L3, 1, Avenue Jean Poulhès, BP 84225, 31432 Toulouse, France
| | - Bernard Masri
- Cancer Research Center of Toulouse, UMR 1037 INSERM - Université Toulouse III, CHU Rangueil, Bât L3, 1, Avenue Jean Poulhès, BP 84225, 31432 Toulouse, France
| | - Yves Audigier
- Cancer Research Center of Toulouse, UMR 1037 INSERM - Université Toulouse III, CHU Rangueil, Bât L3, 1, Avenue Jean Poulhès, BP 84225, 31432 Toulouse, France.
| |
Collapse
|
20
|
Lv SY, Yang YJ, Chen Q. Regulation of feeding behavior, gastrointestinal function and fluid homeostasis by apelin. Peptides 2013; 44:87-92. [PMID: 23557907 DOI: 10.1016/j.peptides.2013.03.024] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2013] [Revised: 03/24/2013] [Accepted: 03/25/2013] [Indexed: 12/27/2022]
Abstract
Apelin was first identified and characterized from bovine stomach extracts as an endogenous ligand for the APJ receptor. Apelin/APJ system is abundantly present in peripheral tissues and central nervous system. Apelin plays a broad role in regulating physiological and pathological functions. Recently, many reports have showed the effects of apelin on feeding behavior, however the results are inconsistent, due to different administration routes, animal species, forms of apelin, etc. Apelin has been involved in stimulating gastric cell proliferation, cholecystokinin (CCK) secretion, histamine release, gastric acid and bicarbonate secretion, and regulation of gastrointestinal motility. In addition, apelin produced regulatory effects on drinking behavior, diuresis, arginine vasopressin (AVP) release and glucocorticoids secretion. This article reviews the role of apelin on feeding behavior, gastrointestinal function and fluid homeostasis.
Collapse
Affiliation(s)
- Shuang-Yu Lv
- Institute of Biochemistry and Molecular Biology, School of Life Sciences, Lanzhou University, 222 Tianshui South Road, Lanzhou, Gansu 730000, China
| | | | | |
Collapse
|
21
|
Characterization of gastric and neuronal histaminergic populations using a transgenic mouse model. PLoS One 2013; 8:e60276. [PMID: 23555941 PMCID: PMC3612060 DOI: 10.1371/journal.pone.0060276] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Accepted: 02/24/2013] [Indexed: 01/29/2023] Open
Abstract
Histamine is a potent biogenic amine that mediates numerous physiological processes throughout the body, including digestion, sleep, and immunity. It is synthesized by gastric enterochromaffin-like cells, a specific set of hypothalamic neurons, as well as a subset of white blood cells, including mast cells. Much remains to be learned about these varied histamine-producing cell populations. Here, we report the validation of a transgenic mouse line in which Cre recombinase expression has been targeted to cells expressing histidine decarboxylase (HDC), which catalyzes the rate-limiting step in the synthesis of histamine. This was achieved by crossing the HDC-Cre mouse line with Rosa26-tdTomato reporter mice, thus resulting in the expression of the fluorescent Tomato (Tmt) signal in cells containing Cre recombinase activity. As expected, the Tmt signal co-localized with HDC-immunoreactivity within the gastric mucosa and gastric submucosa and also within the tuberomamillary nucleus of the brain. HDC expression within Tmt-positive gastric cells was further confirmed by quantitative PCR analysis of mRNA isolated from highly purified populations of Tmt-positive cells obtained by fluorescent activated cell sorting (FACS). HDC expression within these FACS-separated cells was found to coincide with other markers of both ECL cells and mast cells. Gastrin expression was co-localized with HDC expression in a subset of histaminergic gastric mucosal cells. We suggest that these transgenic mice will facilitate future studies aimed at investigating the function of histamine-producing cells.
Collapse
|
22
|
Stefani CB, de Oliveira RM, Silveira AAA, Ferraz LFC, Ribeiro ML, Gambero A, Pedrazzoli Júnior J. Expression of Toll-like receptors in enterocromaffin-like cells and their function in histamine release. Dig Dis Sci 2012; 57:2270-7. [PMID: 22618577 DOI: 10.1007/s10620-012-2176-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Accepted: 04/04/2012] [Indexed: 12/14/2022]
Abstract
INTRODUCTION Enterocromaffin-like cells (ECL) are specialized endocrine gastric cells able to release histamine, which in turn controls gastric acid production by parietal cells. Helicobacter pylori infection and other conditions signal in the gastrointestinal tract via Toll-like receptors (TLRs) and modify gastric acid production, but there is no evidence of expression and function of TLRs in ECL cells. In this work, we analyzed gene and protein expression of TLR-2, 4, 5, and 9, and other molecules involved in TLR signaling in ECL cells. MATERIAL AND METHODS ECL cells were isolated from Sprague-Dawley rats. The histamine-releasing ability of TLR ligands was also evaluated after culture of the ECL cells for a short time. RESULTS With ECL cells that expressed the TLR-2, TLR-4, TLR-5, and TLR-9 genes we were able to confirm protein expression for TLR-2, TLR-5, and TLR-9. Functionally, ECL cells were able to release histamine in response to TLR-2 stimulation by peptidoglycan (PGN), a TLR-2 ligand. After PGN stimulus, IRAK and p38 phosphorylation could be observed. SB 203580, a p38 inhibitor, reversed PGN-induced histamine release. Lipopolysaccharide (LPS), a TLR-4 ligand, was also able to induce histamine release in ECL cells, but by a mechanism independent of TLRs. CONCLUSIONS We have demonstrated for the first time that ECL cells express TLRs and respond to TLR-2 ligand by increasing histamine release. This response could be involved in host defense against gastrointestinal bacterial pathogens but could also contribute to control of gastric acid secretion in the absence of pathogens.
Collapse
Affiliation(s)
- Carolina Bernardi Stefani
- Clinical Pharmacology and Gastroenterology Unit, São Francisco University Medical School, Av. São Francisco de Assis 218, Bragança Paulista, SP 12916-900, Brazil
| | | | | | | | | | | | | |
Collapse
|
23
|
Grosse J, Meier K, Bauer TJ, Eilles C, Grimm D. Cell separation by countercurrent centrifugal elutriation: recent developments. Prep Biochem Biotechnol 2012; 42:217-33. [PMID: 22509848 DOI: 10.1080/10826068.2011.602799] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Countercurrent centrifugal elutriation (CCE) is a cell separation technique that separates particles predominantly according to their size, and to some degree according to their specific density, without a need for antibodies or ligands tagging cell surfaces. The principles of this technique have been known for half a century. Still, numerous recent publications confirmed that CCE is a valuable supplement to current cell separation technology. It is mainly applied when homogeneous populations of cells, which mirror an in vivo situation, are required for answering scientific questions or for clinical transplantation, while antibodies or ligands suitable for cell isolation are not available. Currently, new technical developments are expanding its application toward fractionation of healthy and malignant tissue cells and the preparation of dendritic cells for immunotherapy.
Collapse
Affiliation(s)
- Jirka Grosse
- Department of Nuclear Medicine, University of Regensburg, Regensburg, Germany
| | | | | | | | | |
Collapse
|
24
|
Abstract
Apelin is a bioactive peptide with diverse physiological actions on many tissues mediated by its interaction with its specific receptor APJ. Since the identification of apelin and APJ in 1998, pleiotropic roles of the apelin/APJ system have been elucidated in different tissues and organs, including modulation of the cardiovascular system, fluid homeostasis, metabolic pathway and vascular formation. In blood vessels, apelin and APJ expression are spatiotemporally regulated in endothelial cells (ECs) during angiogenesis. In vitro analysis revealed that the apelin/APJ system regulates angiogenesis by the induction of proliferation, migration and cord formation of cultured ECs. Moreover, apelin seems to stabilize cell-cell junctions of ECs. In addition, genetically engineered mouse models suggest that apelin/APJ regulates vascular stabilization and maturation in physiological and pathological angiogenesis. In this review, we summarize the current understanding of the apelin/APJ system for vascular formation and maturation.
Collapse
Affiliation(s)
- Hiroyasu Kidoya
- Department of Signal Transduction, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
| | | |
Collapse
|
25
|
Apelin-12 stimulates acid secretion through an increase of histamine release in rat stomachs. ACTA ACUST UNITED AC 2012; 174:71-8. [DOI: 10.1016/j.regpep.2011.12.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 10/25/2011] [Accepted: 12/12/2011] [Indexed: 12/29/2022]
|
26
|
Abstract
Abstract The endocrine cells of the gastrointestinal (GI) tract and the pancreas, referred to as the enteroendocrine cells, secrete a large variety of peptides and amines that regulate functions of the digestive tract itself and of distant organs. Taken together, the enteroendocrine cells form the largest system of endocrine cells in the body, presently comprising 16 cell types. Many of them have been named after letters of the alphabet, but the names are only occasionally related to morphological or functional characteristics of the cell. In this review of the normal, adult, mammalian enteroendocrine cells, we summarize synonyms, functions, locations, structure, stored hormones/amines, receptors, and other cellular expressions. We propose that the enteroendocrine cells should be renamed after their most well-known hormone/amine and, when applicable, their anatomical location, with opportunities for future revisions.
Collapse
Affiliation(s)
- Herbert F Helander
- Department of Gastrosurgical Research and Education, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
| | | |
Collapse
|
27
|
Kidoya H, Kunii N, Naito H, Muramatsu F, Okamoto Y, Nakayama T, Takakura N. The apelin/APJ system induces maturation of the tumor vasculature and improves the efficiency of immune therapy. Oncogene 2011; 31:3254-64. [PMID: 22037214 DOI: 10.1038/onc.2011.489] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Immature and unstable tumor vasculature provides an aberrant tumor microenvironment and leads to resistance of tumors to conventional therapy. Hence, normalization of tumor vessels has been reported to improve the effect of immuno-, chemo- and radiation therapy. However, the humoral factors, which can effectively induce maturation of tumor vasculature, have not been elucidated. In this study, we found that the novel peptide apelin and its receptor APJ can induce the morphological and functional maturation of blood vessels in tumors. This apelin-induced tumor vascular maturation enhances the efficacy of cancer dendritic cell-based immunotherapy and significantly suppresses tumor growth by promoting the infiltration of invariant natural killer T cells into the central region of the tumor and thereby robustly inducing apoptosis of tumor cells. Additionally, we showed APJ expression to be enhanced in the tumor endothelium in comparison with normal-state endothelial cells. These findings provide a new target for tumor vascular-specific maturation, which is expected to improve the efficacy of conventional cancer therapies.
Collapse
Affiliation(s)
- H Kidoya
- Department of Signal Transduction, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | | | | | | | | | | | | |
Collapse
|
28
|
Flemström G, Mäkelä K, Purhonen AK, Sjöblom M, Jedstedt G, Walkowiak J, Herzig KH. Apelin stimulation of duodenal bicarbonate secretion: feeding-dependent and mediated via apelin-induced release of enteric cholecystokinin. Acta Physiol (Oxf) 2011; 201:141-50. [PMID: 20726845 DOI: 10.1111/j.1748-1716.2010.02175.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
AIMS Apelin peptides are the endogenous ligand of the G protein-coupled receptor APJ. Proposed actions include involvement in control of cardiovascular functions, appetite and body metabolism. We have investigated the effects of apelin peptides on duodenal bicarbonate secretion in vivo and the release of cholecystokinin (CCK) from acutely isolated mucosal cells and the neuroendocrine cell line STC-1. METHODS Lewis × Dark Agouti rats had free access to water and, unless fasted overnight, free access to food. A segment of proximal duodenum was cannulated in situ in anaesthetized animals. Mucosal bicarbonate secretion was titrated (pH stat) and apelin was administered to the duodenum by close intra-arterial infusion. Total RNA was extracted from mucosal specimens, reverse transcripted to cDNA and the expression of the APJ receptor measured by quantitative real-time PCR. Apelin-induced release of CCK was measured using (1) cells prepared from proximal small intestine and (2) STC-1 cells. RESULTS Even the lowest dose of apelin-13 (6 pmol kg⁻¹ h⁻¹) caused a significant rise in bicarbonate secretion. Stimulation occurred only in continuously fed animals and even a 100-fold greater dose (600 pmol kg⁻¹ h⁻¹) of apelin was without effect in overnight food-deprived animals. Fasting also induced an eightfold decrease in the expression of APJ receptor mRNA. Apelin induced significant release of CCK from both mucosal and STC-1 cells, and the CCK(A) receptor antagonist devazepide abolished bicarbonate secretory responses to apelin. CONCLUSION Apelin-induced stimulation of duodenal electrolyte secretion is feeding-dependent and mediated by local mucosal release of CCK.
Collapse
Affiliation(s)
- G Flemström
- Department of Neuroscience, Uppsala University, Sweden.
| | | | | | | | | | | | | |
Collapse
|
29
|
Goebel M, Stengel A, Lambrecht NWG, Sachs G. Selective gene expression by rat gastric corpus epithelium. Physiol Genomics 2010; 43:237-54. [PMID: 21177383 DOI: 10.1152/physiolgenomics.00193.2010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The gastrointestinal (GI) tract is divided into several segments that have distinct functional properties, largely absorptive. The gastric corpus is the only segment thought of as largely secretory. Microarray hybridization of the gastric corpus mucosal epithelial cells was used to compare gene expression with other segments of the columnar GI tract followed by statistical data subtraction to identify genes selectively expressed by the rat gastric corpus mucosa. This provides a means of identifying less obvious specific functions of the corpus in addition to its secretion-related genes. For example, important properties found by this GI tract comparative transcriptome reflect the energy demand of acid secretion, a role in lipid metabolism, the large variety of resident neuroendocrine cells, responses to damaging agents and transcription factors defining differentiation of its epithelium. In terms of overlap of gastric corpus genes with the rest of the GI tract, the distal small bowel appears to express many of the gastric corpus genes in contrast to proximal small and large bowel. This differential map of gene expression by the gastric corpus epithelium will allow a more detailed description of major properties of the gastric corpus and may lead to the discovery of gastric corpus cell differentiation genes and those mis-regulated in gastric carcinomas.
Collapse
Affiliation(s)
- M Goebel
- Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | | | | | | |
Collapse
|
30
|
Sibilia V, Pagani F, Bulgarelli I, Tulipano G, Possenti R, Guidobono F. Characterization of the mechanisms involved in the gastric antisecretory effect of TLQP-21, a vgf-derived peptide, in rats. Amino Acids 2010; 42:1261-8. [PMID: 21132337 DOI: 10.1007/s00726-010-0818-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Accepted: 11/18/2010] [Indexed: 10/18/2022]
Abstract
TLQP-21, a vgf-derived peptide modulates gastric emptying and prevents ethanol-induced gastric lesions in rats. However, it remains to be studied whether or not TLQP-21 affects gastric acid secretion. In this study, we evaluated the effects of central (0.8-8 nmol/rat) or peripheral (48-240 nmol/kg, intraperitoneally) TLQP-21 administration on gastric acid secretion in pylorus-ligated rats. The mechanisms involved in such activity were also examined. Central TLQP-21 injection significantly reduced gastric acid volume and dose-dependently inhibited total acid output (ED(50) = 2.71 nmol), while peripheral TLQP-21 administration had no effect. The TLQP-21 antisecretory activity was prevented by cysteamine (300 mg/kg, subcutaneously), a depletor of somatostatin, by indomethacin (0.25 mg/rat, intracerebroventricularly), a non-selective cyclooxygenase inhibitor, and by functional ablation of sensory nerves by capsaicin. We conclude that TLQP-21 could be considered a new member of the large group of regulatory peptides affecting gastric acid secretion. The central inhibitory effect of TLQP-21 on gastric acid secretion is mediated by endogenous somatostatin and prostaglandins and requires the integrity of sensory nerve fibres.
Collapse
Affiliation(s)
- Valeria Sibilia
- Department of Pharmacology, Chemotherapy and Medical Toxicology, Università degli Studi di Milano, Via Vanvitelli, 32, 20129, Milan, Italy.
| | | | | | | | | | | |
Collapse
|
31
|
Pitkin SL, Maguire JJ, Bonner TI, Davenport AP. International Union of Basic and Clinical Pharmacology. LXXIV. Apelin Receptor Nomenclature, Distribution, Pharmacology, and Function. Pharmacol Rev 2010; 62:331-42. [DOI: 10.1124/pr.110.002949] [Citation(s) in RCA: 132] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
|
32
|
Abstract
Abstract
The efficacy of therapeutic angiogenesis for revascularization in ischemia using genes, proteins, and cells has been established. For further improvement, processes allowing enlargement of the luminal cavity to facilitate efficient blood flow need to be facilitated. Recently, we found that expression of APJ and its specific ligand, apelin, is seen in endothelial cells when angiogenesis is taking place during embryogenesis. Apelin-deficient mice are viable but have narrow intersomitic vessels during embryogenesis and narrow blood vessels in the trachea and skin after birth. Apelin induces the formation of larger cords of endothelial cells, mainly mediated by cell-cell aggregation, resulting in the generation of larger blood vessels. Here we report that transgenic overexpression of apelin in keratinocytes induces enlarged but not leaky blood vessels in the dermis. In the hind limb ischemia model, apelin together with vascular endothelial growth factor (VEGF) effectively induced functional vessels larger than with VEGF alone. Endogenous apelin is required for the suppression of VEGF-, histamine-, or inflammation-induced vascular hyperpermeability. Apelin inhibited the down-modulation of vascular endothelial-cadherin by VEGF, resulting in suppression of hyperpermeability. Our results suggest apelin efficacy for therapeutic angiogenesis.
Collapse
|
33
|
Ontogeny of apelin and its receptor in the rodent gastrointestinal tract. ACTA ACUST UNITED AC 2009; 158:32-9. [PMID: 19660504 DOI: 10.1016/j.regpep.2009.07.016] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2009] [Revised: 07/22/2009] [Accepted: 07/23/2009] [Indexed: 11/23/2022]
Abstract
Apelin is the endogenous ligand for the APJ receptor and both apelin and APJ are expressed in the gastrointestinal (GI) tract. The aim of this study was to define ontogeny of apelin and APJ in the developing rodent GI tract by measuring expression levels and characterizing abundance and cellular localization at an embryonic stage (E18.5 or E21), two postnatal stages (P4, P16) and in the adult. Apelin and APJ mRNA levels were measured by real time RT-PCR, apelin and APJ-containing cells were identified by immunohistochemical (IHC) staining. Gastric, duodenal and colonic apelin and APJ mRNA levels were highest at birth and declined postnatally. In the postnatal rat stomach, few apelin peptide-containing cells were identified, the density of gastric apelin-containing cells increased progressively after weaning and into adulthood. A robust APJ immunostaining was observed postnatally in the epithelium, intestinal goblet cells and in smooth muscle cells. In the adult rat, APJ immunostaining in the surface epithelium and goblet cells decreased markedly. During the early postnatal period, in an apelin-deficient mouse, APJ expression and immunostaining in the gut were reduced suggesting that apelin regulates APJ. Together, our data support a role for the apelin-APJ system in the regulation of smooth muscle, epithelial and goblet cell function in the GI tract.
Collapse
|
34
|
Capoccia BJ, Huh WJ, Mills JC. How form follows functional genomics: gene expression profiling gastric epithelial cells with a particular discourse on the parietal cell. Physiol Genomics 2009; 37:67-78. [PMID: 19208773 DOI: 10.1152/physiolgenomics.90408.2008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The cellular composition and morphology of the stomach epithelium have been described in detail; however, the molecular mechanisms that regulate the differentiation of the various cell lineages as well as the function of mature gastric cells are far less clear. Recently, dissection of the molecular anatomy of the stomach has been boosted by the advent of functional genomics, which allows investigators to determine patterns of gene expression across virtually the entire cellular transcriptome. In this review, we discuss the impact of functional genomic studies on the understanding of gastric epithelial physiology. We show how functional genomic studies have uncovered genes that are useful as new cell lineage-specific markers of differentiation and provide new insights into cell physiology. For example, vascular endothelial growth factor B (Vegfb) has been identified as a parietal cell-specific marker that may allow parietal cells to regulate the mucosal vascular network. We also discuss how functional genomics has identified aberrantly expressed genes in disease states. Human epididymis 4 (HE4), for example, was recently identified as a metaplasia-induced gene product in mice based on microarray analysis. Finally, we will examine how analysis of higher-order patterns of gene expression can go beyond simply identifying individual genes to show how cells work as integrated systems. Specifically, we show how application of a Gene Ontology (GO) analysis of gene expression patterns from multiple tissues identifies the gastric parietal cell as an outlier, unlike other differentiated cell lineages in the stomach or elsewhere in the body.
Collapse
Affiliation(s)
- Benjamin J Capoccia
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri 63110, USA
| | | | | |
Collapse
|
35
|
Stengel A, Goebel M, Yakubov I, Wang L, Witcher D, Coskun T, Taché Y, Sachs G, Lambrecht NWG. Identification and characterization of nesfatin-1 immunoreactivity in endocrine cell types of the rat gastric oxyntic mucosa. Endocrinology 2009; 150:232-8. [PMID: 18818289 PMCID: PMC2630900 DOI: 10.1210/en.2008-0747] [Citation(s) in RCA: 249] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Hypothalamic nesfatin-1, derived from the nucleobindin2 (NUCB2) precursor, inhibits nocturnal food intake and body weight gain in rats. Nesfatin-1 is able to cross the blood-brain barrier, suggesting a peripheral source of nesfatin-1. Many centrally acting food intake regulatory neuropeptides are also produced in the periphery, especially in the gastrointestinal tract. Therefore, we investigated the gene expression of NUCB2 and distribution of nesfatin-1-immunoreactive cells in the stomach. Microarray mRNA expression profiles in purified small endocrine cells of the gastric mucosa substantiated by quantitative RT-PCR showed significantly higher NUCB2 mRNA expression compared with brain and heart. Western blot confirmed the expression of NUCB2 protein and its transport into a secretory soluble fraction of gastric mucosal endocrine cell homogenates. Immunohistochemical colabeling for nesfatin-1 and ghrelin, histidine decarboxylase, or somatostatin revealed two subtypes of nesfatin-1-positive endocrine cells. Cells in the midportion of the glands coexpressed nesfatin-1 and ghrelin, whereas few cells in the glandular base coexpressed nesfatin-1 and somatostatin or histidine decarboxylase. High-resolution three-dimensional volume imaging revealed two separate populations of intracytoplasmic vesicles in these cells, one containing nesfatin-1 and the other ghrelin immunoreactivity. Microarray rat genome expression data of NUCB2 in small gastric endocrine cells confirmed by quantitative RT-PCR showed significant down-regulation of NUCB2 after 24 h fasting. In summary, NUCB2 mRNA expression as well as protein content is present in a specific subset of gastric endocrine cells, most of which coexpress ghrelin. NUCB2 gene expression is significantly regulated by nutritional status, suggesting a regulatory role of peripheral nesfatin-1 in energy homeostasis.
Collapse
Affiliation(s)
- Andreas Stengel
- CURE/Digestive Diseases Research Center, Center for Neurobiology of Stress, Digestive Diseases Division, Department of Medicine, University of California, Los Angeles, California, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Han S, Wang G, Qi X, Englander EW, Greeley GH. Involvement of a Stat3 binding site in inflammation-induced enteric apelin expression. Am J Physiol Gastrointest Liver Physiol 2008; 295:G1068-78. [PMID: 18818315 PMCID: PMC2584824 DOI: 10.1152/ajpgi.90493.2008] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Apelin is the endogenous ligand for the APJ receptor; both are expressed in the gastrointestinal tract. Experimental colitis in rodents and inflammatory bowel disease in humans are associated with increased intestinal apelin production. Our aim was to use LPS and proinflammatory cytokine-treated (IL-6 and IFN-gamma) rodents or enteric cells to identify signaling mechanisms underlying inflammation-induced enteric apelin expression. LPS, IL-6, or IFN-gamma treatment of rodents increased enteric apelin expression. Pharmacological blockade of Jak/Stat signaling or IL-6 antibody administration inhibited elevations in enteric apelin expression. Transient transfection experiments showed that LPS, IL-6, or IFN-gamma increased apelin expression by stimulation of apelin promoter activity, and blockade of Jak/Stat signaling abolished elevations in apelin promoter activity. A chromatin immunoprecipitation assay showed that IL-6 induced binding of phospho-Stat3 to a putative Stat3 site in the apelin promoter; mutation of this site abrogated the LPS-induced elevation in apelin promoter activity. Together, our findings indicate that binding of phospho-Stat3 to the apelin promoter is the final step underlying proinflammatory cytokine-induced enteric apelin expression during intestinal inflammation.
Collapse
Affiliation(s)
- Song Han
- Department of Surgery, University of Texas Medical Branch, Galveston, Texas
| | - Guiyun Wang
- Department of Surgery, University of Texas Medical Branch, Galveston, Texas
| | - Xiang Qi
- Department of Surgery, University of Texas Medical Branch, Galveston, Texas
| | - Ella W. Englander
- Department of Surgery, University of Texas Medical Branch, Galveston, Texas
| | - George H. Greeley
- Department of Surgery, University of Texas Medical Branch, Galveston, Texas
| |
Collapse
|
37
|
Han S, Wang G, Qi X, Lee HM, Englander EW, Greeley GH. A possible role for hypoxia-induced apelin expression in enteric cell proliferation. Am J Physiol Regul Integr Comp Physiol 2008; 294:R1832-9. [PMID: 18367654 DOI: 10.1152/ajpregu.00083.2008] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Apelin is the endogenous ligand for the APJ receptor, and apelin and APJ are expressed in the gastrointestinal (GI) tract. Intestinal inflammation increases intestinal hypoxia-inducible factor (HIF) and apelin expression. Hypoxia and inflammation are closely linked cellular insults. The purpose of these studies was to investigate the influence of hypoxia on enteric apelin expression. Exposure of rat pups to acute hypoxia increased hepatic, stomach-duodenal, and colonic apelin mRNA levels 10-, 2-, and 2-fold, respectively (P < 0.05 vs. controls). Hypoxia also increased colonic APJ mRNA levels, and apelin treatment during hypoxia exposure enhanced colonic APJ mRNA levels further. In vitro hypoxia also increased apelin and APJ mRNA levels. The hypoxia-induced elevation in apelin expression is most likely mediated by HIF, since HIF-activated apelin transcriptional activity is dependent on an intact, putative HIF binding site in the rat apelin promoter. Acute exposure of rat pups to hypoxia lowered gastric and colonic epithelial cell proliferation; hypoxia in combination with apelin treatment increased epithelial proliferation by 50%. In vitro apelin treatment of enteric cells exposed to hypoxia increased cell proliferation. Apelin treatment during normoxia was ineffective. Our studies imply that the elevation in apelin expression during hypoxia and inflammation in the GI tract functions in part to stimulate epithelial cell proliferation.
Collapse
Affiliation(s)
- Song Han
- Department of Surgery, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, USA
| | | | | | | | | | | |
Collapse
|
38
|
Abstract
Apelin is a bioactive peptide known as the ligand of the G protein-coupled receptor APJ. Diverse active apelin peptides exist under the form of 13, 17 or 36 amino acids, originated from a common 77-amino-acid precursor. Both apelin and APJ mRNA are widely expressed in several rodent and human tissues and have functional effects in both the central nervous system and peripheral tissues. Apelin has been shown to be involved in the regulation of cardiovascular functions, fluid homeostasis, vessel formation and cell proliferation. More recently, apelin has been described as an adipocyte-secreted factor (adipokine), up-regulated in obesity. By acting as circulating hormone or paracrine factor, adipokines are involved in physiological regulations (fat depot development, energy storage, metabolism or eating behavior) or in the promotion of obesity-associated disorders (type 2 diabetes and cardiovascular dysfunctions). In this regard, expression of apelin gene in adipose tissue is increased by insulin and TNFα. This review will consider the main roles of apelin in physiopathology with particular attention on its role in energy balance regulation and in obesity-associated disorders.
Collapse
|
39
|
Modlin IM, Champaneria MC, Chan AKC, Kidd M. A three-decade analysis of 3,911 small intestinal neuroendocrine tumors: the rapid pace of no progress. Am J Gastroenterol 2007; 102:1464-73. [PMID: 17391319 DOI: 10.1111/j.1572-0241.2007.01185.x] [Citation(s) in RCA: 124] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVES Small intestinal neuroendocrine tumors (SI-NETs) are the most common gastrointestinal neuroendocrine tumor, but their natural history and outcome remain poorly defined, which hinders both the prediction of disease progression and appropriate therapeutic options. We examined patterns, incidence, prognosis, and outcomes of these tumors over a 30-yr period. METHODS Data were extracted from the NCI's SEER registry (1973-2002). Incidence rates, distribution, and 5-yr survival rates were analyzed and adjusted (U.S. decennial census data). RESULTS Of the 18,641 NETs, 3,911 (21.0%) were SI-NETs, of which 1,953 (49.6%) were ileal. Since 1973, both SI-NET and its ileal variant have increased annually by 3.8% and 2.1%, respectively. Ileal tumors, as a percentage of SI tumors, have increased from 52% to 63.6%. The age-adjusted incidence of ileal, small intestinal, and digestive system NETs has increased 225%, 460%, and 720% over 30 yr. Ileal tumors have specifically increased in prevalence in white (274%) and black (500%) men and women (213% and 286%, respectively); an overall increase of fourfold in blacks and 2.4-fold in whites. Although 83.3% of SI-NETs were staged, 83.7% were histologically ungraded. Five-year survival rates for SI-NETs were 62.6 +/- 1% (all stages), 73.8% (localized), 72% (regional), and 43.2% (distant). These have not significantly altered since 1973 (P= 0.11). CONCLUSIONS SI-NETs have increased, particularly in men and in the black population, which may be due to in vivo changes, increased clinical and pathological awareness, or increased detection of tumors. SI-NETs are malignant, diagnosed late, and survival rates have remained unchanged over 30 yr.
Collapse
Affiliation(s)
- Irvin M Modlin
- Gastrointestinal Pathobiology Research Group, Yale University School of Medicine, New Haven, Connecticut 06520-8062, USA
| | | | | | | |
Collapse
|
40
|
Sachs G, Shin JM, Vagin O, Lambrecht N, Yakubov I, Munson K. The gastric H,K ATPase as a drug target: past, present, and future. J Clin Gastroenterol 2007; 41 Suppl 2:S226-42. [PMID: 17575528 PMCID: PMC2860960 DOI: 10.1097/mcg.0b013e31803233b7] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The recent progress in therapy if acid disease has relied heavily on the performance of drugs targeted against the H,K ATPase of the stomach and the H2 receptor antagonists. It has become apparent in the last decade that the proton pump is the target that has the likelihood of being the most sustainable area of therapeutic application in the regulation of acid suppression. The process of activation of acid secretion requires a change in location of the ATPase from cytoplasmic tubules into the microvilli of the secretory canaliculus of the parietal cell. Stimulation of the resting parietal cell, with involvement of F-actin and ezrin does not use significant numbers of SNARE proteins, because their message is depleted in the pure parietal cell transcriptome. The cell morphology and gene expression suggest a tubule fusion-eversion event. As the active H,K ATPase requires efflux of KCl for activity we have, using the transcriptome derived from 99% pure parietal cells and immunocytochemistry, provided evidence that the KCl pathway is mediated by a KCQ1/KCNE2 complex for supplying K and CLIC6 for supplying the accompanying Cl. The pump has been modeled on the basis of the structures of different conformations of the sr Ca ATPase related to the catalytic cycle. These models use the effects of site directed mutations and identification of the binding domain of the K competitive acid pump antagonists or the defined site of binding for the covalent class of proton pump inhibitors. The pump undergoes conformational changes associated with phosphorylation to allow the ion binding site to change exposure from cytoplasmic to luminal exposure. We have been able to postulate that the very low gastric pH is achieved by lysine 791 motion extruding the hydronium ion bound to carboxylates in the middle of the membrane domain. These models also allow description of the K entry to form the K liganded form of the enzyme and the reformation of the ion site inward conformation thus relating the catalytic cycle of the pump to conformational models. The mechanism of action of the proton pump inhibitor class of drug is discussed along with the cysteines covalently bound with these inhibitors. The review concludes with a discussion of the mechanism of action and binding regions of a possible new class of drug for acid control, the K competitive acid pump antagonists.
Collapse
Affiliation(s)
- George Sachs
- Department of Physiology, David Geffen School of Medicine, University of California at Los Angeles, CA, USA.
| | | | | | | | | | | |
Collapse
|
41
|
Abstract
Gastric enterochromaffin-like (ECL) cells release histamine in response to food because of elevation of gastrin and neural release of pituitary adenylate cyclase-activating peptide (PACAP). Acid secretion is at a basal level in the absence of food but is rapidly stimulated with feeding. Rats fasted for 24 h showed a significant decrease of mucosal histamine despite steady-state expression of the histamine-synthesizing enzyme histidine decarboxylase (HDC). Comparative transcriptomal analysis using gene expression oligonucleotide microarrays of 95% pure ECL cells from fed and 24-h fasted rats, thereby eliminating mRNA contamination from other gastric mucosal cell types, identified significantly increased gene expression of the enzymes histidase and urocanase catabolizing the HDC substrate L-histidine but significantly decreased expression of the cellular L-histidine uptake transporter SN2 and of the vesicular monoamine transporter 2 (VMAT-2) responsible for histamine uptake into secretory vesicles. This was confirmed by reverse transcriptase-quantitative polymerase chain reaction of gastric fundic mucosal samples from fed and 24-h fasted rats. The decrease of VMAT-2 gene expression was also shown by a decrease in VMAT-2 protein content in protein extracts from fed and 24-h fasted rats compared with equal amounts of HDC protein and Na-K-ATPase alpha(1)-subunit protein content. These results indicate that rat gastric ECL cells regulate their histamine content during 24-h fasting not by a change in HDC gene or protein expression but by regulation of substrate concentration for HDC and a decreased histamine secretory pool.
Collapse
Affiliation(s)
- Nils W G Lambrecht
- Departments of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, California, USA.
| | | | | |
Collapse
|
42
|
Friis-Hansen L, Schjerling CK, de la Cour CD, Håkanson R, Rehfeld JF. Characteristics of gastrin controlled ECL cell specific gene expression. ACTA ACUST UNITED AC 2007; 140:153-61. [PMID: 17239973 DOI: 10.1016/j.regpep.2006.12.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2006] [Revised: 11/23/2006] [Accepted: 12/01/2006] [Indexed: 11/28/2022]
Abstract
BACKGROUND The ECL cells are histamine-producing endocrine cells in the oxyntic mucosa that synthesize and secrete proteins and peptides. They are the primary target for gastrin and mediate the control of gastrin on acid secretion and oxyntic mucosal growth. Knowledge of the molecular biology of the ECL cell is therefore important for understanding gastric physiology. Accordingly, we wanted to identify genes that are characteristically expressed in the ECL cells and controlled by gastrin. METHODS Using Affymetrix GeneChips, RNA expression profiles were generated from ECL cells isolated by counterflow elutriation from hyper- or hypogastrinemic rats. Contamination from non-endocrine cells was eliminated by subtraction of the expression profiles of the fundic and antral mucosa. RESULTS The expression of 365 genes was ECL cell characteristic. Gastrin was found to control the expression of 120 which could be divided into two major groups depending on the known or anticipated biological function of the encoded protein: genes encoding proteins involved in the secretory process and genes encoding proteins needed to generate energy for secretion. Interestingly, gastrin stimulation also increased ECL cells expression of anti-apoptotic genes. CONCLUSION The ECL cell specific expression profile is reminiscent of that of neurons and other endocrine cells exhibiting high expression of genes encoding proteins involved in the synthesis, storage and secretion of neuropeptides or peptide hormones. Gastrin regulated the expression of one third of these genes and is thus involved in the control of secretion from the ECL cells.
Collapse
Affiliation(s)
- Lennart Friis-Hansen
- Department of Clinical Biochemistry, Rigshospitalet, University of Copenhagen, Denmark.
| | | | | | | | | |
Collapse
|
43
|
Kidd M, Modlin IM, Black JW, Boyce M, Culler M. A comparison of the effects of gastrin, somatostatin and dopamine receptor ligands on rat gastric enterochromaffin-like cell secretion and proliferation. ACTA ACUST UNITED AC 2007; 143:109-17. [PMID: 17531331 DOI: 10.1016/j.regpep.2007.04.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2007] [Revised: 04/17/2007] [Accepted: 04/17/2007] [Indexed: 12/13/2022]
Abstract
Gastrin regulates ECL cell histamine release and is a critical determinant of acid secretion. ECL cell secretion and proliferation is inhibited by gastrin antagonists and somatostatin but little is known about the role of dopamine agonists in this process. Since the ECL cell exhibits all three classes of receptor we evaluated and compared the effects of the gastrin receptor antagonist, (YF476), lanreotide (SST agonist) and novel dopaminergic agents (BIM53061 and BIM27A760) on ECL cell histamine secretion and proliferation. Highly enriched (>98%) ECL cell preparations prepared from rat gastric mucosa using a FACS approach were studied. Real-time PCR confirmed presence of the CCK2, SS2 and SS5 and D1 receptors on ECL cells. YF476 inhibited histamine secretion and proliferation with IC(50)s of 1.25 nM and 1.3 x 10(-11) M respectively, values 10-1000x more potent than L365,260. Lanreotide inhibited secretion and proliferation (2.2 nM, 1.9 x 10(-10) M) and increased YF476-inhibited proliferation a further 5-fold. The dopamine agonist, BIM53061, inhibited gastrin-mediated ECL cell secretion and proliferation (17 nM, 6 x 10(-10) M) as did the novel dopamine/somatostatin chimera BIM23A760 (22 nM, 4.9 x 10(-10) M). Our studies demonstrate that the gastrin receptor antagonist, YF476, is the most potent inhibitor of ECL cell histamine secretion and proliferation. Lanreotide, a dopamine agonist and a dopamine/somatostatin chimera inhibited ECL cell function but were 10-1000x less potent than YF476. Agents that selectively target the CCK2 receptor may provide alternative therapeutic strategies for gastrin-mediated gastrointestinal cell secretion and proliferation such as evident in the hypergastrinemic gastric carcinoids associated with low acid states.
Collapse
MESH Headings
- Animals
- Benzodiazepinones/pharmacology
- Cell Proliferation/drug effects
- Cells, Cultured
- Dopamine Agonists/pharmacology
- Dose-Response Relationship, Drug
- Enterochromaffin-like Cells/cytology
- Enterochromaffin-like Cells/drug effects
- Enterochromaffin-like Cells/metabolism
- Gastrins/pharmacology
- Gene Expression/drug effects
- Histamine Release/drug effects
- Immunohistochemistry
- Male
- Peptides, Cyclic/pharmacology
- Phenylurea Compounds/pharmacology
- Rats
- Rats, Sprague-Dawley
- Receptor, Cholecystokinin B/antagonists & inhibitors
- Receptor, Cholecystokinin B/genetics
- Receptor, Cholecystokinin B/metabolism
- Receptors, Dopamine/genetics
- Receptors, Dopamine/metabolism
- Receptors, Somatostatin/agonists
- Receptors, Somatostatin/genetics
- Receptors, Somatostatin/metabolism
- Somatostatin/analogs & derivatives
- Somatostatin/pharmacology
Collapse
Affiliation(s)
- M Kidd
- Department of Surgery, Yale University School of Medicine New Haven, Connecticut 06520-8062, United Sates
| | | | | | | | | |
Collapse
|
44
|
Abstract
Gastrin, a potent stimulator of gastric acid secretion, primarily targets the acid-secreting parietal cells and histamine-secreting enterochromaffin-like (ECL) cells in the stomach. Accordingly, gastrin-deficient (GAS-KO) mice have a severe impairment in acid secretion. The aim of this study was to characterize changes in gene expression in GAS-KO mice to identify gastrin-regulated genes and to gain insight into how gastric cell types are regulated by gastrin and acid secretion. Affymetrix microarray analysis of GAS-KO and wild-type mice identified numerous differentially expressed transcripts. The results were compared with GAS-KO mice treated with gastrin to identify genes that were gastrin responsive. Finally, genes that were primarily changed due to gastrin and not hypochlorhydria were identified by comparison to mice that are deficient in both gastrin and cholecystokinin (GAS/CCK-KO), since these mice have restored basal acid secretion. The data were validated by quantitative reverse transcriptase polymerase chain reaction analysis. Interestingly, a number of inflammatory response genes were induced in GAS-KO mice and normalized in GAS/CCK-KO mice, suggesting that they were increased in response to low gastric acid. Moreover, a number of parietal cell transcripts that were downregulated in GAS-KO mice were similarly restored in GAS/CCK-KO mice, suggesting that parietal cell changes were also primarily associated with hypochlorhydria. In contrast, ECL cell genes that were markedly downregulated in GAS-KO mice continued to be reduced in GAS/CCK-KO mice, demonstrating that gastrin coordinately regulates a number of ECL cell genes, including several involved in histamine synthesis and secretion.
Collapse
Affiliation(s)
- Renu N Jain
- Department of Molecular and Integrative Physiology, The University of Michigan, Ann Arbor, Michigan 48109-2200, USA
| | | |
Collapse
|
45
|
Han S, Wang G, Qiu S, de la Motte C, Wang HQ, Gomez G, Englander EW, Greeley GH. Increased colonic apelin production in rodents with experimental colitis and in humans with IBD. ACTA ACUST UNITED AC 2007; 142:131-7. [PMID: 17391779 DOI: 10.1016/j.regpep.2007.02.002] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2006] [Revised: 02/07/2007] [Accepted: 02/12/2007] [Indexed: 12/14/2022]
Abstract
Apelin and its receptor, the APJ receptor, are expressed in the gastrointestinal tract. The aims of this study were to examine the effects of sodium dextran sulfate (DSS)-induced experimental colitis in rats and mice and inflammatory bowel disease (IBD) in humans on intestinal apelin production, and the influence of exogenous apelin on colonic epithelial cell proliferation in mice. In rodents with experimental colitis, colonic apelin mRNA levels were elevated during the inflammatory reaction as well as during the tissue repair phase that ensues after DSS withdrawal. Fluctuations in colonic apelin expression were paralleled by similar changes in apelin immunostaining. Apelin immunostaining was increased in the surface epithelium, in epithelial cells along the length of the tubular gland and in the stem cell region at the gland base. In ulcerative colitis (UC) and Crohn's disease patients, apelin immunostaining revealed a pattern of increased intestinal apelin content similar to that observed in rodents with experimental colitis. Administration of synthetic apelin to mice during the recovery phase of DSS-induced colitis stimulated colonic epithelial cell proliferation significantly. Our observations that colonic apelin production is increased during and after DSS exposure indicate that apelin plays multiple roles during the different stages of colitis. Additionally, the stimulatory action of exogenous apelin on colonic epithelial proliferation suggests that the increased apelin production during intestinal recovery stage may contribute to the repair of the intestinal epithelium in experimental rodent models of colitis and in IBD patients.
Collapse
Affiliation(s)
- Song Han
- Department of Surgery, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555-0725, USA
| | | | | | | | | | | | | | | |
Collapse
|
46
|
Kidd M, Modlin IM, Eick GN, Camp RL, Mane SM. Role of CCN2/CTGF in the proliferation of Mastomys enterochromaffin-like cells and gastric carcinoid development. Am J Physiol Gastrointest Liver Physiol 2007; 292:G191-200. [PMID: 16950763 DOI: 10.1152/ajpgi.00131.2006] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Mastomys enterochromaffin-like (ECL) cell proliferation is initially gastrin driven, but once neoplasia develops, cells become gastrin autonomous. We hypothesized that CCN2 (CTGF), a mitogenic growth factor, may regulate ECL cell proliferation. A Mastomys GeneChip database was examined (dCHIP) to identify CCN2 expression levels. CCN2 in normal and tumor ECL cell preparations obtained using FACS (100 nM acridine orange) was examined by real-time PCR. CCN2 protein was identified in mucosal and ECL cell preparations by immunohistochemistry. Short-term cultured cells were stimulated with either CCN2 or CCN2 + EGF, and proliferation was measured (MTT assay). The ERK1/2 inhibitor PD-98059 (0.1-100 microM) was assessed in terms of CCN2 (1 ng/ml)-mediated proliferation and ERK1/2 phosphorylation. CCN2 transcript and protein was then examined in clinical gastric carcinoids. The ccn2 transcript was upregulated in tumor samples compared with the normal mucosa (+2.36-fold, P < 0.01). PCR demonstrated that ccn2 was not expressed in FACS-prepared (>98% pure) normal ECL cells but was elevated in tumor ECL cell fractions (41.3 +/- 10.7-fold). Immunostaining of the Mastomys gastric mucosa and FACS preparations confirmed that CCN2 protein was present in ECL tumors but not in normal ECL cells. Neither CCN2 nor CCN2 + EGF stimulated normal ECL cell proliferation. CCN2 stimulated tumor proliferation (EC50 approximately 0.01 ng/ml); EGF significantly augmented (P < 0.01) CCN2-induced tumor cell proliferation (EC50 = 20 pg/ml). PD-98059 inhibited CCN2-induced proliferation (-12 +/- 3%, P < 0.05) and ERK1/2 phosphorylation (-34 +/- 5%, P < 0.05) in tumor cells. In clinical samples, both CCN2 transcript and protein were elevated in gastrin-autonomous carcinoids (P < 0.02) compared with the normal mucosa. In conclusion, CCN2 may be a proliferative regulator of Mastomys ECL neoplastic proliferation once these cells become autonomous of gastrin regulation. Identification of CCN2 in gastric carcinoid tissue may be useful both as an indicator of ECL cell transformation and may define gastrin autonomy, a criteria of gastric carcinoid malignancy.
Collapse
Affiliation(s)
- M Kidd
- Department of Surgery, Yale University School of Medicine, TMP202, 333 Cedar St., New Haven, CT 06520-8062, USA
| | | | | | | | | |
Collapse
|
47
|
Sorli SC, van den Berghe L, Masri B, Knibiehler B, Audigier Y. Therapeutic potential of interfering with apelin signalling. Drug Discov Today 2006; 11:1100-6. [PMID: 17129829 DOI: 10.1016/j.drudis.2006.10.011] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2006] [Revised: 09/25/2006] [Accepted: 10/19/2006] [Indexed: 01/28/2023]
Abstract
The apelin receptor is a G protein-coupled receptor activated by several apelin fragments. Its tissue distribution suggests that apelin signalling is involved in a broad range of physiological functions. Endothelial cells, which express high levels of apelin receptors, respond to apelin through the phosphorylation of key intracellular effectors associated with cell proliferation and migration. In addition, apelin is a mitogen for endothelial cells and exhibits angiogenic properties in matrigel experiments. This review focuses on the therapeutic potential of apelin signalling, which is associated with pathologies that result from decreased vascularisation (ischemias) or neovascularisation (retinopathies and solid tumors).
Collapse
Affiliation(s)
- S Caroline Sorli
- IFR31, Unité INSERM U-589, CHU Rangueil, Bât. L3, BP84225, 1 avenue Jean-Poulhès, 31432-Toulouse Cédex 4, France
| | | | | | | | | |
Collapse
|
48
|
Wang G, Qi X, Wei W, Englander EW, Greeley GH. Characterization of the 5'‐regulatory regions of the rat and human apelin genes and regulation of breast apelin by USF. FASEB J 2006; 20:2639-41. [PMID: 17060400 DOI: 10.1096/fj.06-6315fje] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Apelin, a peptide widely expressed in the body, is the endogenous ligand for the APJ receptor. To investigate how the apelin gene is regulated transcriptionally, we cloned and characterized approximately 3000 and approximately 4000 bp 5'-upstream fragments of the rat and human apelin genes. Putative CAAT-like box, but not TATA-box sites were identified. The rat (-207/-1 bp) and human (-100/+74 bp) core promoter sequences contain putative binding sites for upstream stimulatory factor (USF)-1/-2. Mutagenesis and overexpression assays showed that USF up-regulates basal and inducible apelin transcription. EMSA and supershift experiments indicated binding of USF-1/-2 to the rat (-114/-109 bp) and human (-84/-79 bp) apelin promoters. ChIP experiments show that USF is recruited to the putative USF binding site in the human apelin promoter in cultured breast cells. In concert with increased breast apelin expression during pregnancy and lactation in rats, EMSAs demonstrate an elevated binding of pregnant and lactating rat breast nuclear proteins to a consensus USF oligonucleotide. In vivo ChIP assays verified increased USF binding to the apelin promoter in breast of lactating rats. Together, our findings show that USF exerts a stimulatory role in regulation of breast apelin expression during pregnancy and lactation.
Collapse
Affiliation(s)
- Guiyun Wang
- Department of Surgery, University of Texas Medical Branch, 301 University Blvd., Galveston, TX 77555, USA
| | | | | | | | | |
Collapse
|