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Yang Z, Zhang X, Zhuo F, Liu T, Luo Q, Zheng Y, Li L, Yang H, Zhang Y, Wang Y, Liu D, Tu P, Zeng K. Allosteric Activation of Transglutaminase 2 via Inducing an "Open" Conformation for Osteoblast Differentiation. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2206533. [PMID: 37088726 PMCID: PMC10288273 DOI: 10.1002/advs.202206533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 03/04/2023] [Indexed: 05/03/2023]
Abstract
Osteoblasts play an important role in the regulation of bone homeostasis throughout life. Thus, the damage of osteoblasts can lead to serious skeletal diseases, highlighting the urgent need for novel pharmacological targets. This study introduces chemical genetics strategy by using small molecule forskolin (FSK) as a probe to explore the druggable targets for osteoporosis. Here, this work reveals that transglutaminase 2 (TGM2) served as a major cellular target of FSK to obviously induce osteoblast differentiation. Then, this work identifies a previously undisclosed allosteric site in the catalytic core of TGM2. In particular, FSK formed multiple hydrogen bonds in a saddle-like domain to induce an "open" conformation of the β-sandwich domain in TGM2, thereby promoting the substrate protein crosslinks by incorporating polyamine. Furthermore, this work finds that TGM2 interacted with several mitochondrial homeostasis-associated proteins to improve mitochondrial dynamics and ATP production for osteoblast differentiation. Finally, this work observes that FSK effectively ameliorated osteoporosis in the ovariectomy mice model. Taken together, these findings show a previously undescribed pharmacological allosteric site on TGM2 for osteoporosis treatment, and also provide an available chemical tool for interrogating TGM2 biology and developing bone anabolic agent.
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Affiliation(s)
- Zhuo Yang
- State Key Laboratory of Natural and Biomimetic DrugsSchool of Pharmaceutical SciencesPeking UniversityBeijing100191China
| | - Xiao‐Wen Zhang
- State Key Laboratory of Natural and Biomimetic DrugsSchool of Pharmaceutical SciencesPeking UniversityBeijing100191China
| | - Fang‐Fang Zhuo
- State Key Laboratory of Natural and Biomimetic DrugsSchool of Pharmaceutical SciencesPeking UniversityBeijing100191China
| | - Ting‐Ting Liu
- State Key Laboratory of Natural and Biomimetic DrugsSchool of Pharmaceutical SciencesPeking UniversityBeijing100191China
| | - Qian‐Wei Luo
- State Key Laboratory of Natural and Biomimetic DrugsSchool of Pharmaceutical SciencesPeking UniversityBeijing100191China
| | - Yong‐Zhe Zheng
- State Key Laboratory of Natural and Biomimetic DrugsSchool of Pharmaceutical SciencesPeking UniversityBeijing100191China
| | - Ling Li
- State Key Laboratory of Natural and Biomimetic DrugsSchool of Pharmaceutical SciencesPeking UniversityBeijing100191China
| | - Heng Yang
- State Key Laboratory of Natural and Biomimetic DrugsSchool of Pharmaceutical SciencesPeking UniversityBeijing100191China
| | - Yi‐Chi Zhang
- State Key Laboratory of Natural and Biomimetic DrugsSchool of Pharmaceutical SciencesPeking UniversityBeijing100191China
| | - Yan‐Hang Wang
- State Key Laboratory of Natural and Biomimetic DrugsSchool of Pharmaceutical SciencesPeking UniversityBeijing100191China
| | - Dan Liu
- Proteomics LaboratoryMedical and Healthy Analytical CenterPeking University Health Science CenterBeijing100191China
| | - Peng‐Fei Tu
- State Key Laboratory of Natural and Biomimetic DrugsSchool of Pharmaceutical SciencesPeking UniversityBeijing100191China
| | - Ke‐Wu Zeng
- State Key Laboratory of Natural and Biomimetic DrugsSchool of Pharmaceutical SciencesPeking UniversityBeijing100191China
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Inhibition of Transglutaminase 2 as a Therapeutic Strategy in Celiac Disease-In Vitro Studies in Intestinal Cells and Duodenal Biopsies. Int J Mol Sci 2023; 24:ijms24054795. [PMID: 36902226 PMCID: PMC10002517 DOI: 10.3390/ijms24054795] [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: 12/30/2022] [Revised: 02/22/2023] [Accepted: 02/24/2023] [Indexed: 03/06/2023] Open
Abstract
Enzymatic modification of gliadin peptides by human transglutaminase 2 (TG2) is a key mechanism in the pathogenesis of celiac disease (CD) and represents a potential therapeutic target. Recently, we have identified the small oxidative molecule PX-12 as an effective inhibitor of TG2 in vitro. In this study, we further investigated the effect of PX-12 and the established active-site directed inhibitor ERW1041 on TG2 activity and epithelial transport of gliadin peptides. We analyzed TG2 activity using immobilized TG2, Caco-2 cell lysates, confluent Caco-2 cell monolayers and duodenal biopsies from CD patients. TG2-mediated cross-linking of pepsin-/trypsin-digested gliadin (PTG) and 5BP (5-biotinamidopentylamine) was quantified by colorimetry, fluorometry and confocal microscopy. Cell viability was tested with a resazurin-based fluorometric assay. Epithelial transport of promofluor-conjugated gliadin peptides P31-43 and P56-88 was analyzed by fluorometry and confocal microscopy. PX-12 reduced TG2-mediated cross-linking of PTG and was significantly more effective than ERW1041 (10 µM, 15 ± 3 vs. 48 ± 8%, p < 0.001). In addition, PX-12 inhibited TG2 in cell lysates obtained from Caco-2 cells more than ERW1041 (10 µM; 12 ± 7% vs. 45 ± 19%, p < 0.05). Both substances inhibited TG2 comparably in the intestinal lamina propria of duodenal biopsies (100 µM, 25 ± 13% vs. 22 ± 11%). However, PX-12 did not inhibit TG2 in confluent Caco-2 cells, whereas ERW1041 showed a dose-dependent effect. Similarly, epithelial transport of P56-88 was inhibited by ERW1041, but not by PX-12. Cell viability was not negatively affected by either substance at concentrations up to 100 µM. PX-12 did not reduce TG2 activity or gliadin peptide transport in confluent Caco-2 cells. This could be caused by rapid inactivation or degradation of the substance in the Caco-2 cell culture. Still, our in vitro data underline the potential of the oxidative inhibition of TG2. The fact that the TG2-specific inhibitor ERW1041 reduced the epithelial uptake of P56-88 in Caco-2 cells further strengthens the therapeutic potential of TG2 inhibitors in CD.
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Paolella G, Sposito S, Romanelli AM, Caputo I. Type 2 Transglutaminase in Coeliac Disease: A Key Player in Pathogenesis, Diagnosis and Therapy. Int J Mol Sci 2022; 23:ijms23147513. [PMID: 35886862 PMCID: PMC9318967 DOI: 10.3390/ijms23147513] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 07/01/2022] [Accepted: 07/04/2022] [Indexed: 11/16/2022] Open
Abstract
Type 2 transglutaminase (TG2) is the main autoantigen in coeliac disease (CD), a widespread inflammatory enteropathy caused by the ingestion of gluten-containing cereals in genetically predisposed individuals. As a consequence, serum antibodies to TG2 represent a very useful marker in CD diagnosis. However, TG2 is also an important player in CD pathogenesis, for its ability to deamidate some Gln residues of gluten peptides, which become more immunogenic in CD intestinal mucosa. Given the importance of TG2 enzymatic activities in CD, several studies have sought to discover specific and potent inhibitors that could be employed in new therapeutical approaches for CD, as alternatives to a lifelong gluten-free diet. In this review, we summarise all the aspects regarding TG2 involvement in CD, including its enzymatic reactions in pathogenesis, the role of anti-TG2 antibodies in disease management, and the exploration of recent strategies to reduce deamidation or to use transamidation to detoxify gluten.
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Affiliation(s)
- Gaetana Paolella
- Department of Chemistry and Biology, University of Salerno, 84084 Fisciano, SA, Italy; (S.S.); (A.M.R.)
- Correspondence: (G.P.); (I.C.)
| | - Silvia Sposito
- Department of Chemistry and Biology, University of Salerno, 84084 Fisciano, SA, Italy; (S.S.); (A.M.R.)
| | | | - Ivana Caputo
- Department of Chemistry and Biology, University of Salerno, 84084 Fisciano, SA, Italy; (S.S.); (A.M.R.)
- European Laboratory for the Investigation of Food-Induced Diseases (ELFID), University of Salerno, 84084 Fisciano, SA, Italy
- Correspondence: (G.P.); (I.C.)
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Yu T, Hu S, Min F, Li J, Shen Y, Yuan J, Gao J, Wu Y, Chen H. Wheat Amylase Trypsin Inhibitors Aggravate Intestinal Inflammation Associated with Celiac Disease Mediated by Gliadin in BALB/c Mice. Foods 2022; 11:1559. [PMID: 35681310 PMCID: PMC9180791 DOI: 10.3390/foods11111559] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 05/04/2022] [Accepted: 05/23/2022] [Indexed: 02/01/2023] Open
Abstract
Celiac disease (CD) is an autoimmune intestinal disorder caused by the ingestion of gluten in people who carry the susceptible gene. In current celiac disease research, wheat gluten is often the main target of attention, neglecting the role played by non-gluten proteins. This study aimed to describe the effects of wheat amylase trypsin inhibitors (ATI, non-gluten proteins) and gliadin in BALB/c mice while exploring the further role of relevant adjuvants (cholera toxin, polyinosinic: polycytidylic acid and dextran sulfate sodium) intervention. An ex vivo splenocyte and intestinal tissue were collected for analysis of the inflammatory profile. The consumption of gliadin and ATI caused intestinal inflammation in mice. Moreover, the histopathology staining of four intestinal sections (duodenum, jejunum, terminal ileum, and middle colon) indicated that adjuvants, especially polyinosinic: polycytidylic acid, enhanced the villi damage and crypt hyperplasia in co-stimulation with ATI and gliadin murine model. Immunohistochemical results showed that tissue transglutaminase and IL-15 expression were significantly increased in the jejunal tissue of mice treated with ATI and gliadin. Similarly, the expression of inflammatory factors (TNF-α, IL-1β, IL-4, IL-13) and Th1/Th2 balance also showed that the inflammation response was significantly increased after co-stimulation with ATI and gliadin. This study provided new evidence for the role of wheat amylase trypsin inhibitors in the pathogenesis of celiac disease.
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Affiliation(s)
- Tian Yu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China; (T.Y.); (F.M.); (J.L.); (Y.S.); (J.Y.); (H.C.)
- Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, China
- School of Food Science and Technology, Nanchang University, Nanchang 330031, China;
| | - Shuai Hu
- Institute of Agricultural Products Processing, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China;
| | - Fangfang Min
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China; (T.Y.); (F.M.); (J.L.); (Y.S.); (J.Y.); (H.C.)
- Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, China
- School of Food Science and Technology, Nanchang University, Nanchang 330031, China;
| | - Jingjing Li
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China; (T.Y.); (F.M.); (J.L.); (Y.S.); (J.Y.); (H.C.)
- Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, China
- School of Food Science and Technology, Nanchang University, Nanchang 330031, China;
| | - Yunpeng Shen
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China; (T.Y.); (F.M.); (J.L.); (Y.S.); (J.Y.); (H.C.)
- Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, China
- School of Food Science and Technology, Nanchang University, Nanchang 330031, China;
| | - Juanli Yuan
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China; (T.Y.); (F.M.); (J.L.); (Y.S.); (J.Y.); (H.C.)
- School of Pharmaceutical Science, Nanchang University, Nanchang 330006, China
| | - Jinyan Gao
- School of Food Science and Technology, Nanchang University, Nanchang 330031, China;
| | - Yong Wu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China; (T.Y.); (F.M.); (J.L.); (Y.S.); (J.Y.); (H.C.)
- Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, China
| | - Hongbing Chen
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China; (T.Y.); (F.M.); (J.L.); (Y.S.); (J.Y.); (H.C.)
- Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, China
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Al Ibrahmi B, Bour A. A short update on new approaches to celiac disease. ACTA BIO-MEDICA : ATENEI PARMENSIS 2022; 93:e2022322. [PMID: 36533746 PMCID: PMC9828896 DOI: 10.23750/abm.v93i6.13673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 09/29/2022] [Indexed: 01/21/2023]
Abstract
Celiac disease is an autoimmune enteropathy of the small intestine, related to gluten intolerance occurring in genetically predisposed patients. Currently, the only available treatment is a lifelong gluten-free diet. However, the total avoidance of gluten is difficult and poses a challenge to patients, nutritionists and treating physicians. For this reason, scientists have developed in recent years new therapeutic approaches complementary to dietary treatment, such as modification of gluten to make gliadin non-toxic, reduction of the inflammatory response with elafin and Lactococcus Lactis, degradation of gluten by endoproteolytic enzymes, and correction of nutritional deficiencies by adding pseudo-cereals to the diet of celiac patients. This literature review focuses on the different treatment strategies for celiac disease previously studied and summarizes the latest advances in this field.
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Affiliation(s)
- Btihaj Al Ibrahmi
- Department of Biology, faculty of Science, University Ibn Tofail, kenitra , Morocco.
| | - Abdellatif Bour
- department of Biology, faculty of Science, University Ibn Tofail, kenitra , Morocco .
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Li Y, Shi R, Qin C, Zhang Y, Liu L, Wu Z. Gluten‐free and prebiotic oat bread: Optimization formulation by transglutaminase improvement dough structure. J FOOD PROCESS PRES 2021. [DOI: 10.1111/jfpp.15684] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yueqin Li
- College of Food and Pharmaceutical Sciences Deep Processing Technology Key Laboratory of Zhejiang Province Animal Protein Food Ningbo University Meishan Campus Ningbo PR China
| | - Ranran Shi
- College of Food and Pharmaceutical Sciences Deep Processing Technology Key Laboratory of Zhejiang Province Animal Protein Food Ningbo University Meishan Campus Ningbo PR China
| | - Chuan Qin
- College of Food and Pharmaceutical Sciences Deep Processing Technology Key Laboratory of Zhejiang Province Animal Protein Food Ningbo University Meishan Campus Ningbo PR China
| | - Yunzhen Zhang
- College of Food and Pharmaceutical Sciences Deep Processing Technology Key Laboratory of Zhejiang Province Animal Protein Food Ningbo University Meishan Campus Ningbo PR China
| | - Lianliang Liu
- College of Food and Pharmaceutical Sciences Deep Processing Technology Key Laboratory of Zhejiang Province Animal Protein Food Ningbo University Meishan Campus Ningbo PR China
| | - Zufang Wu
- College of Food and Pharmaceutical Sciences Deep Processing Technology Key Laboratory of Zhejiang Province Animal Protein Food Ningbo University Meishan Campus Ningbo PR China
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Falcigno L, Calvanese L, Conte M, Nanayakkara M, Barone MV, D’Auria G. Structural Perspective of Gliadin Peptides Active in Celiac Disease. Int J Mol Sci 2020; 21:E9301. [PMID: 33291297 PMCID: PMC7731278 DOI: 10.3390/ijms21239301] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 12/04/2020] [Indexed: 12/12/2022] Open
Abstract
Gluten fragments released in gut of celiac individuals activate the innate or adaptive immune systems. The molecular mechanisms associated with the adaptive response involve a series of immunodominant gluten peptides which are mainly recognized by human leucocyte antigen (HLA)-DQ2.5 and HLA-DQ8. Other peptides, such as A-gliadin P31-43, are not recognized by HLA and trigger innate responses by several routes not yet well detailed. Among the gluten fragments known to be active in Celiac disease, here we focus on the properties of all gluten peptides with known tri-dimensional structure either those locked into HLA-DQ complexes whose crystals were X-ray analyzed or characterized in solution as free forms. The aim of this work was to find the structural reasons why some gluten peptides prompt the adaptive immune systems while others do not, by apparently involving just the innate immune routes. We propose that P31-43 is a non-adaptive prompter because it is not a good ligand for HLA-DQ. Even sharing a similar ability to adopt polyproline II structure with the adaptive ones, the way in which the proline residues are located along the sequence disfavors a productive P31-43-HLA-DQ binding.
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Affiliation(s)
- Lucia Falcigno
- Department of Pharmacy, University of Naples Federico II, Via Mezzocannone 16, 80134 Naples, Italy;
| | - Luisa Calvanese
- Department of Pharmacy, University of Naples Federico II, Via Mezzocannone 16, 80134 Naples, Italy;
| | - Mariangela Conte
- Department of Translational Medical Science, Section of Pediatrics, University of Naples Federico II, 80131 Naples, Italy; (M.C.); (M.N.); (M.V.B.)
- European Laboratory for the Investigation of Food Induced Diseases (ELFID), University of Naples Federico II, 80131 Naples, Italy
| | - Merlin Nanayakkara
- Department of Translational Medical Science, Section of Pediatrics, University of Naples Federico II, 80131 Naples, Italy; (M.C.); (M.N.); (M.V.B.)
- European Laboratory for the Investigation of Food Induced Diseases (ELFID), University of Naples Federico II, 80131 Naples, Italy
| | - Maria Vittoria Barone
- Department of Translational Medical Science, Section of Pediatrics, University of Naples Federico II, 80131 Naples, Italy; (M.C.); (M.N.); (M.V.B.)
- European Laboratory for the Investigation of Food Induced Diseases (ELFID), University of Naples Federico II, 80131 Naples, Italy
| | - Gabriella D’Auria
- Department of Pharmacy, University of Naples Federico II, Via Mezzocannone 16, 80134 Naples, Italy;
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Chirdo FG, Auricchio S, Troncone R, Barone MV. The gliadin p31-43 peptide: Inducer of multiple proinflammatory effects. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2020; 358:165-205. [PMID: 33707054 DOI: 10.1016/bs.ircmb.2020.10.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Coeliac disease (CD) is the prototype of an inflammatory chronic disease induced by food. In this context, gliadin p31-43 peptide comes into the spotlight as an important player of the inflammatory/innate immune response to gliadin in CD. The p31-43 peptide is part of the p31-55 peptide from α-gliadins that remains undigested for a long time, and can be present in the small intestine after ingestion of a gluten-containing diet. Different biophysical methods and molecular dynamic simulations have shown that p31-43 spontaneously forms oligomeric nanostructures, whereas experimental approaches using in vitro assays, mouse models, and human duodenal tissues have shown that p31-43 is able to induce different forms of cellular stress by driving multiple inflammatory pathways. Increased proliferative activity of the epithelial cells in the crypts, enterocyte stress, activation of TG2, induction of Ca2+, IL-15, and NFκB signaling, inhibition of CFTR, alteration of vesicular trafficking, and activation of the inflammasome platform are some of the biological effects of p31-43, which, in the presence of appropriate genetic susceptibility and environmental factors, may act together to drive CD.
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Affiliation(s)
- Fernando Gabriel Chirdo
- Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Instituto de Estudios Inmunológicos y Fisiopatológicos-IIFP (UNLP-CONICET), La Plata, Argentina.
| | - Salvatore Auricchio
- European Laboratory for the Investigation of Food Induced Diseases (ELFID), University Federico II, Naples, Italy
| | - Riccardo Troncone
- European Laboratory for the Investigation of Food Induced Diseases (ELFID), University Federico II, Naples, Italy; Department of Translational Medical Science, University Federico II, Naples, Italy
| | - Maria Vittoria Barone
- European Laboratory for the Investigation of Food Induced Diseases (ELFID), University Federico II, Naples, Italy; Department of Translational Medical Science, University Federico II, Naples, Italy
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