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Mlayah-Bellalouna S, Aissaoui-Zid D, Chantome A, Jebali J, Souid S, Ayedi E, Mejdoub H, Belghazi M, Marrakchi N, Essafi-Benkhadir K, Vandier C, Srairi-Abid N. Insights into the mechanisms governing P01 scorpion toxin effect against U87 glioblastoma cells oncogenesis. Front Pharmacol 2023; 14:1203247. [PMID: 37426811 PMCID: PMC10326281 DOI: 10.3389/fphar.2023.1203247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 06/12/2023] [Indexed: 07/11/2023] Open
Abstract
The emerging concept of small conductance Ca2+-activated potassium channels (SKCa) as pharmacological target for cancer treatment has significantly increased in recent years. In this study, we isolated the P01 toxin from Androctonus australis (Aa) scorpion venom and investigated its effect on biological properties of glioblastoma U87, breast MDA-MB231 and colon adenocarcinoma LS174 cancer cell lines. Our results showed that P01 was active only on U87 glioblastoma cells. It inhibited their proliferation, adhesion and migration with IC50 values in the micromolar range. We have also shown that P01 reduced the amplitude of the currents recorded in HEK293 cells expressing SK2 channels with an IC50 value of 3 pM, while it had no effect on those expressing SK3 channels. The investigation of the SKCa channels expression pattern showed that SK2 transcripts were expressed differently in the three cancer cell lines. Particularly, we highlighted the presence of SK2 isoforms in U87 cells, which could explain and rely on the specific activity of P01 on this cell line. These experimental data highlighted the usefulness of scorpion peptides to decipher the role of SKCa channels in the tumorigenesis process, and develop potential therapeutic molecules targeting glioblastoma with high selectivity.
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Affiliation(s)
- Saoussen Mlayah-Bellalouna
- LR20IPT01 Biomolécules, Venins et Application Théranostique, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - Dorra Aissaoui-Zid
- LR20IPT01 Biomolécules, Venins et Application Théranostique, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - Aurelie Chantome
- N2C UMR 1069, Institut national de la santé et de la recherche médicale, University of Tours, Tours, France
| | - Jed Jebali
- LR20IPT01 Biomolécules, Venins et Application Théranostique, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - Soumaya Souid
- LR16IPT04 Laboratoire d’Epidémiologie Moléculaire et Pathologie Expérimentale, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - Emna Ayedi
- LR20IPT01 Biomolécules, Venins et Application Théranostique, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - Hafedh Mejdoub
- USCR Séquenceur de Protéines, Faculté des Sciences de Sfax, Route de Soukra, Sfax, Tunisia
| | - Maya Belghazi
- Aix Marseille Université, CNRS, Plateforme Protéomique, IMM FR3479, Marseille Protéomique (MaP), Marseille, France
| | - Naziha Marrakchi
- LR20IPT01 Biomolécules, Venins et Application Théranostique, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - Khadija Essafi-Benkhadir
- LR16IPT04 Laboratoire d’Epidémiologie Moléculaire et Pathologie Expérimentale, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - Christophe Vandier
- N2C UMR 1069, Institut national de la santé et de la recherche médicale, University of Tours, Tours, France
| | - Najet Srairi-Abid
- LR20IPT01 Biomolécules, Venins et Application Théranostique, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
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Abdelkafi-Koubaa Z, ELBini-Dhouib I, Souid S, Jebali J, Doghri R, Srairi-Abid N, Essafi-Benkhadir K, Micheau O, Marrakchi N. Pharmacological Investigation of CC-LAAO, an L-Amino Acid Oxidase from Cerastes cerastes Snake Venom. Toxins (Basel) 2021; 13:toxins13120904. [PMID: 34941741 PMCID: PMC8704781 DOI: 10.3390/toxins13120904] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 11/01/2021] [Accepted: 11/22/2021] [Indexed: 11/16/2022] Open
Abstract
Snake venom proteins, which are responsible for deadly snakebite envenomation, induce severe injuries including neurotoxicity, myotoxicity, cardiotoxicity, hemorrhage, and the disruption of blood homeostasis. Yet, many snake-venom proteins have been developed as potential drugs for treating human diseases due to their pharmacological effects. In this study, we evaluated the use of, an L-amino acid oxidase isolated from Cerastes cerastes snake venom CC-LAAO, as a potential anti-glioblastoma drug, by investigating its in vivo and in vitro pharmacological effects. Our results showed that acute exposure to CC-LAAO at 1 and 2.5 µg/mL does not induce significant toxicity on vital organs, as indicated by the murine blood parameters including aspartate transaminase (AST), alanine transaminase (ALT), lactate dehydrogenase (LDH) activities, and creatinine levels. The histopathological examination demonstrated that only at high concentrations did CC-LAAO induce inflammation and necrosis in several organs of the test subjects. Interestingly, when tested on human glioblastoma U87 cells, CC-LAAO induced a dose-dependent apoptotic effect through the H2O2 generated during the enzymatic reaction. Taken altogether, our data indicated that low concentration of CC-LAAO may be safe and may have potential in the development of anti-glioblastoma agents.
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Affiliation(s)
- Zaineb Abdelkafi-Koubaa
- Laboratoire des Biomolécules, Venins et Applications Théranostiques (LR20IPT01), Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis 1002, Tunisia; (I.E.-D.); (J.J.); (N.S.-A.); (N.M.)
- Correspondence:
| | - Ines ELBini-Dhouib
- Laboratoire des Biomolécules, Venins et Applications Théranostiques (LR20IPT01), Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis 1002, Tunisia; (I.E.-D.); (J.J.); (N.S.-A.); (N.M.)
| | - Soumaya Souid
- Laboratoire d’Epidémiologie Moléculaire et de Pathologie Expérimentale (LR16IPT04), Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis 1002, Tunisia; (S.S.); (K.E.-B.)
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, 1800 Bienville Drive, Monroe, LA 71201, USA
| | - Jed Jebali
- Laboratoire des Biomolécules, Venins et Applications Théranostiques (LR20IPT01), Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis 1002, Tunisia; (I.E.-D.); (J.J.); (N.S.-A.); (N.M.)
| | - Raoudha Doghri
- Département d’Anatomie Pathologique, Institut Salah Azaiez, Bab Saadoun, Tunis 1006, Tunisia;
| | - Najet Srairi-Abid
- Laboratoire des Biomolécules, Venins et Applications Théranostiques (LR20IPT01), Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis 1002, Tunisia; (I.E.-D.); (J.J.); (N.S.-A.); (N.M.)
| | - Khadija Essafi-Benkhadir
- Laboratoire d’Epidémiologie Moléculaire et de Pathologie Expérimentale (LR16IPT04), Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis 1002, Tunisia; (S.S.); (K.E.-B.)
| | - Olivier Micheau
- Lipides Nutrition Cancer, INSERM-UMR 1231, Université de Bourgogne Franche-Comté, UFR Science de Santé, 7 Bd Jeanne d’Arc, 21000 Dijon, France;
| | - Naziha Marrakchi
- Laboratoire des Biomolécules, Venins et Applications Théranostiques (LR20IPT01), Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis 1002, Tunisia; (I.E.-D.); (J.J.); (N.S.-A.); (N.M.)
- Faculté de Médecine de Tunis, Université de Tunis El Manar, Tunis 1068, Tunisia
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Abdelwahed KS, Siddique AB, Qusa MH, King JA, Souid S, Abd Elmageed ZY, El Sayed KA. PCSK9 Axis-Targeting Pseurotin A as a Novel Prostate Cancer Recurrence Suppressor Lead. ACS Pharmacol Transl Sci 2021; 4:1771-1781. [DOI: 10.1021/acsptsci.1c00145] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Indexed: 01/02/2023]
Affiliation(s)
- Khaldoun S. Abdelwahed
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, 1800 Bienville Drive, Monroe, Louisiana 71201, United States
| | - Abu Bakar Siddique
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, 1800 Bienville Drive, Monroe, Louisiana 71201, United States
| | - Mohammed H. Qusa
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, 1800 Bienville Drive, Monroe, Louisiana 71201, United States
| | - Judy Ann King
- Department of Pathology and Translational Pathobiology, LSU Health Shreveport, 1501 Kings Highway, Shreveport, Louisiana 71103, United States
| | - Soumaya Souid
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, 1800 Bienville Drive, Monroe, Louisiana 71201, United States
| | - Zakaria Y. Abd Elmageed
- Department of Pharmacology, Edward Via College of Osteopathic Medicine, University of Louisiana at Monroe, Monroe, Louisiana 71203, United States
| | - Khalid A. El Sayed
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, 1800 Bienville Drive, Monroe, Louisiana 71201, United States
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Souid S, Aissaoui D, Srairi-Abid N, Essafi-Benkhadir K. Trabectedin (Yondelis®) as a Therapeutic Option in Gynecological Cancers: A Focus on its Mechanisms of Action, Clinical Activity and Genomic Predictors of Drug Response. Curr Drug Targets 2021; 21:996-1007. [PMID: 31994460 DOI: 10.2174/1389450121666200128161733] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 10/25/2019] [Accepted: 11/20/2019] [Indexed: 02/07/2023]
Abstract
The use of predictive biomarkers provides potential individualized cancer therapeutic options to prevent therapy failure as well as serious toxicities. Several recent studies showed that predictive and prognostic biomarkers are a notable personalized strategy to improve patients' care in several cancers. Trabectedin (Yondelis®) is a cytotoxic agent, derived from a marine organism, harbouring a significant antitumor activity against several cancers such as soft tissue sarcoma, ovarian, and breast cancers. Recently and with the advent of molecular genetic testing, BRCA mutational status was found as an important predictor of response to this anticancer drug, especially in gynecological cancers. The aim of this updated review is to discuss the mechanisms of action of trabectedin against the wellknown cancer hallmarks described until today. The current advances were also examined related to genomic biomarkers that can be used in the future to predict the efficacy of this potent anticancer natural molecule in various gynecological cancers.
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Affiliation(s)
- Soumaya Souid
- Universite de Tunis El Manar, Institut Pasteur de Tunis, LR16IPT04 Epidemiologie Moleculaire et Pathologie Experimentale appliquee aux Maladies infectieuses, 1002, Tunis, Tunisia
| | - Dorra Aissaoui
- Universite de Tunis El Manar, Institut Pasteur de Tunis, LR16IPT08 Venins et biomolecules therapeutiques, 1002, Tunis, Tunisia
| | - Najet Srairi-Abid
- Universite de Tunis El Manar, Institut Pasteur de Tunis, LR16IPT08 Venins et biomolecules therapeutiques, 1002, Tunis, Tunisia
| | - Khadija Essafi-Benkhadir
- Universite de Tunis El Manar, Institut Pasteur de Tunis, LR16IPT04 Epidemiologie Moleculaire et Pathologie Experimentale appliquee aux Maladies infectieuses, 1002, Tunis, Tunisia
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5
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Issaouia M, Bendini A, Souid S, Flamini G, Barbieri S, Gallina Toschi T, Hammami M. Flavored olive oils: focus on their acceptability and thermal stability. Grasas y Aceites 2019. [DOI: 10.3989/gya.0224181] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The presence of flavored olive oils (FOO) on the market represents an answer to an increasing consumer demand for novel and healthy food. This work aims to compare the sensory acceptability and the thermal stability of FOO prepared by mixing different flavors (lemon, onion, garlic, paprika) to an extra virgin olive oil (EVOO) also used as the control sample. 96 Tunisian citizens were involved in a consumer test and the lemon flavored oil was the most liked whereas the least liked was the oil with onion. Samples were subjected to different heat treatments (60 °C, 100 °C, 200 °C for 1, 2, 4, 8 hours) and the flavor addition did not influence the EVOO stability when samples were heated at 60 °C, whereas at 200 °C the FOO with onion and garlic showed higher oxidative stability. The thermo-oxidation process at 60 °C and at 100 °C of the FOOs was not detrimental for the volatile compound markers but the effect was noticeable for all these markers at 200 °C.
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Souid S, Elsayed HE, Ebrahim HY, Mohyeldin MM, Siddique AB, Karoui H, El Sayed KA, Essafi-Benkhadir K. 13 1 -Oxophorbine protopheophorbide A from Ziziphus lotus as a novel mesenchymal-epithelial transition factor receptor inhibitory lead for the control of breast tumor growth in vitro and in vivo. Mol Carcinog 2018; 57:1507-1524. [PMID: 29978911 DOI: 10.1002/mc.22874] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 06/27/2018] [Accepted: 07/03/2018] [Indexed: 12/18/2022]
Abstract
The failure of chemotherapy especially in triple negative breast cancer (TNBC) patients has been correlated with the overexpression of the mesenchymal-epithelial transition factor (c-Met) receptor. Thus, the hepatocyte growth factor (HGF)/c-Met signaling axis has gained considerable attention as a valid molecular target for breast cancer therapy. This study reports for the first time the discovery of the 131 -oxophorbines pheophorbide A and protopheophorbide A along with chlorophyllide A from Ziziphus lotus, an edible typical Tunisian plant, as the potent antiproliferative compounds against the human breast cancer cells MDA-MB-231 and MCF-7. Compared to other compounds, protopheophorbide A exerted the highest light-independent antiproliferative effect against the metastatic TNBC MDA-MB-231 cells (IC50 = 6.5 μM). In silico, this compound targeted the kinase domain of multiple c-Met crystal structures. It potently inhibited the kinase domain phosphorylation of wild and mutant c-Met in Z-LYTE kinase assay. Protopheophorbide A inhibited HGF-induced downstream c-Met-dependent cell proliferation, survival, adhesion and migration through RAF/MEK/ERK and PI3K/PTEN/AKT signaling pathways modulation, ROS generation and activation of JNK and p38 pathways. Interestingly, this compound impaired the ability of the MDA-MB-231 cells to adhere at different extracellular matrix proteins by reducing the HGF-induced expression of integrins αv, β3, α2, and β1. Moreover, protopheophorbide A exhibited anti-migratory properties (IC50 = 2.2 μM) through impacting the expression levels of E-cadherin, vimentin, β-catenin, FAK, Brk, Rac, and Src proteins. Importantly, treatment with protopheophorbide A significantly inhibited the MDA-MB-231 tumor growth in vivo. Our results suggest that protopheophorbide A could be a novel c-Met inhibitory lead with promise to control c-Met/HGF-dependent breast malignancies.
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Affiliation(s)
- Soumaya Souid
- Institut Pasteur de Tunis, LR11IPT04, LR16IPT04 Laboratoire d'Epidémiologie Moléculaire et Pathologie Expérimentale Appliquée Aux Maladies Infectieuses, Tunis, Tunisia.,Université de Tunis El Manar, Tunis, Tunisia
| | - Heba E Elsayed
- Department of Basic Pharmaceutical Sciences, School of Pharmacy, University of Louisiana at Monroe, Monroe, Louisiana
| | - Hassan Y Ebrahim
- Department of Basic Pharmaceutical Sciences, School of Pharmacy, University of Louisiana at Monroe, Monroe, Louisiana
| | - Mohamed M Mohyeldin
- Department of Basic Pharmaceutical Sciences, School of Pharmacy, University of Louisiana at Monroe, Monroe, Louisiana.,Department of Pharmacognosy, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt
| | - Abu Bakar Siddique
- Department of Basic Pharmaceutical Sciences, School of Pharmacy, University of Louisiana at Monroe, Monroe, Louisiana
| | - Habib Karoui
- Institut Pasteur de Tunis, LR11IPT04, LR16IPT04 Laboratoire d'Epidémiologie Moléculaire et Pathologie Expérimentale Appliquée Aux Maladies Infectieuses, Tunis, Tunisia.,Université de Tunis El Manar, Tunis, Tunisia
| | - Khalid A El Sayed
- Department of Basic Pharmaceutical Sciences, School of Pharmacy, University of Louisiana at Monroe, Monroe, Louisiana
| | - Khadija Essafi-Benkhadir
- Institut Pasteur de Tunis, LR11IPT04, LR16IPT04 Laboratoire d'Epidémiologie Moléculaire et Pathologie Expérimentale Appliquée Aux Maladies Infectieuses, Tunis, Tunisia.,Université de Tunis El Manar, Tunis, Tunisia
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Aissaoui D, Mlayah-Bellalouna S, Jebali J, Abdelkafi-Koubaa Z, Souid S, Moslah W, Othman H, Luis J, ElAyeb M, Marrakchi N, Essafi-Benkhadir K, Srairi-Abid N. Functional role of Kv1.1 and Kv1.3 channels in the neoplastic progression steps of three cancer cell lines, elucidated by scorpion peptides. Int J Biol Macromol 2018; 111:1146-1155. [DOI: 10.1016/j.ijbiomac.2018.01.144] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 01/19/2018] [Accepted: 01/20/2018] [Indexed: 12/11/2022]
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Souid S, Najjaa H, Riahi-Chebbi I, Haoues M, Neffati M, Arnault I, Auger J, Karoui H, Essafi M, Essafi-Benkhadir K. Allium RoseumL. Extract Exerts Potent Suppressive Activities on Chronic Myeloid Leukemia K562 Cell Viability Through the Inhibition of BCR-ABL, PI3K/Akt, and ERK1/2Pathways and the Abrogation of VEGF Secretion. Nutr Cancer 2016; 69:117-130. [DOI: 10.1080/01635581.2017.1248295] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Bendhifi Zarroug M, Baraket G, Zourgui L, Souid S, Salhi Hannachi A. Genetic diversity and phylogenetic relationship among Tunisian cactus species (Opuntia) as revealed by random amplified microsatellite polymorphism markers. Genet Mol Res 2015; 14:1423-33. [PMID: 25730081 DOI: 10.4238/2015.february.13.21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Opuntia ficus indica is one of the most economically important species in the Cactaceae family. Increased interest in this crop stems from its potential contribution to agricultural diversification, application in the exploitation of marginal lands, and utility as additional income sources for farmers. In Tunisia, O. ficus indica has been affected by drastic genetic erosion resulting from biotic and abiotic stresses. Thus, it is imperative to identify and preserve this germplasm. In this study, we focused on the use of random amplified microsatellite polymorphisms to assess genetic diversity among 25 representatives of Tunisian Opuntia species maintained in the collection of the National Institute of Agronomic Research of Tunisia. Seventy-two DNA markers were screened to discriminate accessions using 16 successful primer combinations. The high percentage of polymorphic band (100%), the resolving power value (5.68), the polymorphic information content (0.94), and the marker index (7.2) demonstrated the efficiency of the primers tested. Therefore, appropriate cluster analysis used in this study illustrated a divergence among the cultivars studied and exhibited continuous variation that occurred independently of geographic origin. O. ficus indica accessions did not cluster separately from the other cactus pear species, indicating that their current taxonomical classifications are not well aligned with their genetic variability or locality of origin.
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Affiliation(s)
- M Bendhifi Zarroug
- Laboratory of Molecular Genetics, Immunology & Biotechnology, Faculty of Sciences of Tunis, Campus University, University of Tunis El Manar, Tunis, Tunisia
| | - G Baraket
- Laboratory of Molecular Genetics, Immunology & Biotechnology, Faculty of Sciences of Tunis, Campus University, University of Tunis El Manar, Tunis, Tunisia
| | - L Zourgui
- Research Unit of Macromolecular Biochemistry and Genetics, Faculty of Sciences of Gafsa, Gafsa, Tunisia
| | - S Souid
- Research Unit of Macromolecular Biochemistry and Genetics, Faculty of Sciences of Gafsa, Gafsa, Tunisia
| | - A Salhi Hannachi
- Laboratory of Molecular Genetics, Immunology & Biotechnology, Faculty of Sciences of Tunis, Campus University, University of Tunis El Manar, Tunis, Tunisia
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Dequier E, Souid S, Pál M, Maróy P, Lepesant JA, Yanicostas C. Top-DER- and Dpp-dependent requirements for the Drosophila fos/kayak gene in follicular epithelium morphogenesis. Mech Dev 2001; 106:47-60. [PMID: 11472834 DOI: 10.1016/s0925-4773(01)00418-x] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The Drosophila fos (Dfos)/kayak gene has been previously identified as a key regulator of epithelial cell morphogenesis during dorsal closure of the embryo and fusion of the adult thorax. We show here that it is also required for two morphogenetic movements of the follicular epithelium during oogenesis. Firstly, it is necessary for the proper posteriorward migration of main body follicle cells during stage 9. Secondly, it controls, from stage 11 onwards, the morphogenetic reorganization of the follicle cells that are committed to secrete the respiratory appendages. We demonstrate that DER pathway activation and a critical level of Dpp/TGFbeta signalling are required to pattern a high level of transcription of Dfos at the anterior and dorsal edges of the two groups of cells that will give rise to the respiratory appendages. In addition, we provide evidence that, within the dorsal-anterior territory, the level of paracrine Dpp/TGFbeta signalling controls the commitment of follicle cells towards either an operculum or an appendage secretion fate. Finally, we show that Dfos is required in follicle cells for the dumping of the nurse cell cytoplasm into the oocyte and the subsequent apoptosis of nurse cells. This suggests that in somatic follicle cells, Dfos controls the expression of one or several factors that are necessary for these processes in underlying germinal nurse cells.
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Affiliation(s)
- E Dequier
- Department of Developmental Biology, Institut Jacques Monod, UMR 7592, CNRS, Université Paris 7 Denis-Diderot and Université Paris 6 Pierre et Marie Curie, 2, Place Jussieu, F-75251 Cedex 05, Paris, France
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