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3. Chirurgie du ganglioneurome médiastinal : une série de 11 cas

Author

Abdennadher, M., primary, Ben Amara, K., additional, Saad, A., additional, Zribi, H., additional, Zairi, S., additional, Bouacida, I., additional, Kaddour-Ayadi, A., additional, Smadhi, H., additional, Touaibia, M., additional, Mezni, F., additional, Ouerghi, S., additional, and Marghli, A., additional

Published
2021
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13. Autotaxin-Lysophosphatidic Acid Signaling Contributed to Obesity-Induced Insulin Resistance in Muscle and Impairs Mitochondrial Metabolism

Author

D'Souza, K., Nzirorera, C., Cowie, A.M., Paramel Varghese, Geena, Trivedi, P., Eichmann, T.O., Biswas, D., Touaibia, M., Morris, A.J., Aidinis, V., Kane, D.A., Pulinilkunnil, T., and Kienesberger, P.C.

Subjects
Medicin och hälsovetenskap, Metabolism, Fysiologi, Physiology, insulin resistance, lipids (amino acids, peptides, and proteins), Medical and Health Sciences
Abstract

Autotaxin (ATX) is an adipokine that generates the bioactive lipid, lysophosphatidic acid (LPA). ATX-LPA signaling has been implicated in diet-induced obesity and systemic insulin resistance. However, it remains unclear whether the ATX-LPA pathway influences insulin function and energy metabolism in target tissues, particularly skeletal muscle, the major site of insulin-stimulated glucose disposal. The objective of this study was to test whether the ATX-LPA pathway impacts tissue insulin signaling and mitochondrial metabolism in skeletal muscle during obesity. Male mice with heterozygous ATX deficiency (ATX +/-) were protected from obesity, systemic insulin resistance, and cardiomyocyte dysfunction following high-fat high-sucrose (HFHS) feeding. HFHS-fed ATX +/- mice also had improved insulin-stimulated AKT phosphorylation in white adipose tissue, liver, heart, and skeletal muscle. Preserved insulin-stimulated glucose transport in muscle from HFHS fed ATX +/- mice was associated with improved mitochondrial pyruvate oxidation in the absence of changes in fat oxidation and ectopic lipid accumulation. Similarly, incubation with LPA decreased insulin-stimulated AKT phosphorylation and mitochondrial energy metabolism in C2C12 myotubes at baseline and following palmitate-induced insulin resistance. Taken together, our results suggest that the ATX-LPA pathway contributes to obesity-induced insulin resistance in metabolically relevant tissues. Our data also suggest that LPA directly impairs skeletal muscle insulin signaling and mitochondrial function. Preserved insulin-stimulated glucose transport in muscle from HFHS fed ATX +/- mice was associated with improved mitochondrial pyruvate oxidation in the absence of changes in fat oxidation and ectopic lipid accumulation. Similarly, incubation with LPA decreased insulin-stimulated AKT phosphorylation and mitochondrial energy metabolism in C2C12 myotubes at baseline and following palmitate-induced insulin resistance. Taken together, our results suggest that the ATX-LPA pathway contributes to obesity-induced insulin resistance in metabolically relevant tissues. Our data also suggest that LPA directly impairs skeletal muscle insulin signaling and mitochondrial function. Preserved insulin-stimulated glucose transport in muscle from HFHS fed ATX +/- mice was associated with improved mitochondrial pyruvate oxidation in the absence of changes in fat oxidation and ectopic lipid accumulation. Similarly, incubation with LPA decreased insulin-stimulated AKT phosphorylation and mitochondrial energy metabolism in C2C12 myotubes at baseline and following palmitate-induced insulin resistance. Taken together, our results suggest that the ATX-LPA pathway contributes to obesity-induced insulin resistance in metabolically relevant tissues. Our data also suggest that LPA directly impairs skeletal muscle insulin signaling and mitochondrial function. incubation with LPA decreased insulin-stimulated AKT phosphorylation and mitochondrial energy metabolism in C2C12 myotubes at baseline and following palmitate-induced insulin resistance. Taken together, our results suggest that the ATX-LPA pathway contributes to obesity-induced insulin resistance in metabolically relevant tissues. Our data also suggest that LPA directly impairs skeletal muscle insulin signaling and mitochondrial function. incubation with LPA decreased insulin-stimulated AKT phosphorylation and mitochondrial energy metabolism in C2C12 myotubes at baseline and following palmitate-induced insulin resistance. Taken together, our results suggest that the ATX-LPA pathway contributes to obesity-induced insulin resistance in metabolically relevant tissues. Our data also suggest that LPA directly impairs skeletal muscle insulin signaling and mitochondrial function., Funding Agencies:Natural Sciences and Engineering Research Council of Canada Canadian Institutes of Health Research Project Banting Research Foundation New Brunswick Health Research Foundation New Brunswick Innovation Foundation Heart and Stroke Foundation of CanadaNatural Sciences and Engineering Research Council of CanadaCanadian Diabetes Association Canada Foundation for Innovation

Published
2018

18. Composition and Anti-inflammatory Effect of the Common Myrtle's (Myrtus communis L.) Essential Oil Growing Wild in Algeria.

Author

Touaibia, M.

Abstract

Copyright of Phytothérapie is the property of John Libbey Eurotext Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2020
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19. Chemical Composition of the Volatile Components of Tropaeolum majus L. (Garden Nasturtium) from North Western Algeria

Author

Benyelles, B., Allali, H., Fekih, N., Touaibia, M., Muselli, A., Djabou, N., Dib, M., Tabti, B., Costa, J., RN, Sciences pour l'environnement (SPE), Centre National de la Recherche Scientifique (CNRS)-Université Pascal Paoli (UPP)-Centre National de la Recherche Scientifique (CNRS)-Université Pascal Paoli (UPP), and Renucci, Franck

Subjects
lcsh:Pharmacy and materia medica, lcsh:Chemistry, Volatiles, GC, Tropaeolaceae, lcsh:QD1-999, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Tropaeolum majus, Tropaeolum majus L, lcsh:RS1-441, GC-MS, [CHIM.ORGA] Chemical Sciences/Organic chemistry, NMR
Abstract

International audience; Essential oil from Tropaeolum majus L. aerial parts, a plant native to North Western Algeria, was obtained by hydrodistillation. The oil volatile components were identified by a combination of gas chromatography/flame ionization detection (GC/FID), GC-mass spectrometry (GC-MS) techniques, and NMR spectroscopy. Nine components representing 92.0 % of the essential oil total (GC/FID chromatogram) were identified. The most abundant compounds were benzyl isothiocyanate (82.5 %), benzene acetonitrile (3.9 %) and 2-phenylethyl isovalerate (2.9 %). Higher content in nitrogen- and sulfur-containing compounds accounting to 86.4 % of the volatile fraction composition of T. majus were quantified.

Published
2015

42. Les infections à Acinetobacter baumaniien réanimation de chirurgie cardiothoracique : facteurs de risque et profil bactériologique

Author

Touaibia, M., Ouerghi, S., Harroum, M., Mtir, M.S., Guelmami, F., Abdennadher, M., Zairi, S., Marghli, A., and Mestiri, T.

Abstract

L’émergence de bactéries multirésistantes dans les unités de soins intensifs présente un souci dans la prise en charge de nos patients vu la morbi-mortalité élevée qui y est associée [1]. L’Acinetobacter baumanii(AB) est un germe en croissance continue dans les unités de réanimation. Le but de notre étude étant de déterminer les facteurs de risque d’infection à AB et son profil bactériologique dans une unité de réanimation de chirurgie thoracique et cardiovasculaire.

Published
2021
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43. 46th Medical Maghrebian Congress. November 9-10, 2018. Tunis

Author

Alami Aroussi, A., Fouad, A., Omrane, A., Razzak, A., Aissa, A., Akkad, A., Amraoui, A., Aouam, A., Arfaoui, A., Belkouchi, A., Ben Chaaben, A., Ben Cheikh, A., Ben Khélifa, A., Ben Mabrouk, A., Benhima, A., Bezza, A., Bezzine, A., Bourrahouat, A., Chaieb, A., Chakib, A., Chetoui, A., Daoudi, A., Ech-Chenbouli, A., Gaaliche, A., Hassani, A., Kassimi, A., Khachane, A., Labidi, A., Lalaoui, A., Masrar, A., Mchachi, A., Nakhli, A., Ouakaa, A., Siati, A., Toumi, A., Zaouali, A., Condé, A. Y., Haggui, A., Belaguid, A., abdelkader jalil el hangouche, Gharbi, A., Mahfoudh, A., Bouzouita, A., Aissaoui, A., Ben Hamouda, A., Hedhli, A., Ammous, A., Bahlous, A., Ben Halima, A., Belhadj, A., Blel, A., Brahem, A., Banasr, A., Meherzi, A., Saadi, A., Sellami, A., Turki, A., Ben Miled, A., Ben Slama, A., Daib, A., Zommiti, A., Chadly, A., Jmaa, A., Mtiraoui, A., Ksentini, A., Methnani, A., Zehani, A., Kessantini, A., Farah, A., Mankai, A., Mellouli, A., Touil, A., Hssine, A., Ben Safta, A., Derouiche, A., Jmal, A., Ferjani, A., Djobbi, A., Dridi, A., Aridhi, A., Bahdoudi, A., Ben Amara, A., Benzarti, A., Ben Slama, A. Y., Oueslati, A., Soltani, A., Chadli, A., Aloui, A., Belghuith Sriha, A., Bouden, A., Laabidi, A., Mensi, A., Sabbek, A., Zribi, A., Green, A., Ben Nasr, A., Azaiez, A., Yeades, A., Belhaj, A., Mediouni, A., Sammoud, A., Slim, A., Amine, B., Chelly, B., Jatik, B., Lmimouni, B., Daouahi, B., Ben Khelifa, B., Louzir, B., Dorra, A., Dhahri, B., Ben Nasrallah, C., Chefchaouni, C., Konzi, C., Loussaief, C., Makni, C., Dziri, C., Bouguerra, C., Kays, C., Zedini, C., Dhouha, C., Mohamed, C., Aichaouia, C., Dhieb, C., Fofana, D., Gargouri, D., Chebil, D., Issaoui, D., Gouiaa, D., Brahim, D., Essid, D., Jarraya, D., Trad, D., Ben Hmida, E., Sboui, E., Ben Brahim, E., Baati, E., Talbi, E., Chaari, E., Hammami, E., Ghazouani, E., Ayari, F., Ben Hariz, F., Bennaoui, F., Chebbi, F., Chigr, F., Guemira, F., Harrar, F., Benmoula, F. Z., Ouali, F. Z., Maoulainine, F. M. R., Bouden, F., Fdhila, F., Améziani, F., Bouhaouala, F., Charfi, F., Chermiti Ben Abdallah, F., Hammemi, F., Jarraya, F., Khanchel, F., Ourda, F., Sellami, F., Trabelsi, F., Yangui, F., Fekih Romdhane, F., Mellouli, F., Nacef Jomli, F., Mghaieth, F., Draiss, G., Elamine, G., Kablouti, G., Touzani, G., Manzeki, G. B., Garali, G., Drissi, G., Besbes, G., Abaza, H., Azzouz, H., Said Latiri, H., Rejeb, H., Ben Ammar, H., Ben Brahim, H., Ben Jeddi, H., Ben Mahjouba, H., Besbes, H., Dabbebi, H., Douik, H., El Haoury, H., Elannaz, H., Elloumi, H., Hachim, H., Iraqi, H., Kalboussi, H., Khadhraoui, H., Khouni, H., Mamad, H., Metjaouel, H., Naoui, H., Zargouni, H., Elmalki, H. O., Feki, H., Haouala, H., Jaafoura, H., Drissa, H., Mizouni, H., Kamoun, H., Ouerda, H., Zaibi, H., Chiha, H., Saibi, H., Skhiri, H., Boussaffa, H., Majed, H., Blibech, H., Daami, H., Harzallah, H., Rkain, H., Ben Massoud, H., Jaziri, H., Ben Said, H., Ayed, H., Harrabi, H., Chaabouni, H., Ladida Debbache, H., Harbi, H., Yacoub, H., Abroug, H., Ghali, H., Kchir, H., Msaad, H., Manai, H., Riahi, H., Bousselmi, H., Limem, H., Aouina, H., Jerraya, H., Ben Ayed, H., Chahed, H., Snéne, H., Lahlou Amine, I., Nouiser, I., Ait Sab, I., Chelly, I., Elboukhani, I., Ghanmi, I., Kallala, I., Kooli, I., Bouasker, I., Fetni, I., Bachouch, I., Bouguecha, I., Chaabani, I., Gazzeh, I., Samaali, I., Youssef, I., Zemni, I., Bachouche, I., Bouannene, I., Kasraoui, I., Laouini, I., Mahjoubi, I., Maoudoud, I., Riahi, I., Selmi, I., Tka, I., Hadj Khalifa, I., Mejri, I., Béjia, I., Bellagha, J., Boubaker, J., Daghfous, J., Dammak, J., Hleli, J., Ben Amar, J., Jedidi, J., Marrakchi, J., Kaoutar, K., Arjouni, K., Ben Helel, K., Benouhoud, K., Rjeb, K., Imene, K., Samoud, K., El Jeri, K., Abid, K., Chaker, K., Bouzghaîa, K., Kamoun, K., Zitouna, K., Oughlani, K., Lassoued, K., Letaif, K., Hakim, K., Cherif Alami, L., Benhmidoune, L., Boumhil, L., Bouzgarrou, L., Dhidah, L., Ifrine, L., Kallel, L., Merzougui, L., Errguig, L., Mouelhi, L., Sahli, L., Maoua, M., Rejeb, M., Ben Rejeb, M., Bouchrik, M., Bouhoula, M., Bourrous, M., Bouskraoui, M., El Belhadji, M., Essakhi, M., Essid, M., Gharbaoui, M., Haboub, M., Iken, M., Krifa, M., Lagrine, M., Leboyer, M., Najimi, M., Rahoui, M., Sabbah, M., Sbihi, M., Zouine, M., Chefchaouni, M. C., Gharbi, M. H., El Fakiri, M. M., Tagajdid, M. R., Shimi, M., Touaibia, M., Jguirim, M., Barsaoui, M., Belghith, M., Ben Jmaa, M., Koubaa, M., Tbini, M., Boughdir, M., Ben Salah, M., Ben Fraj, M., Ben Halima, M., Ben Khalifa, M., Bousleh, M., Limam, M., Mabrouk, M., Mallouli, M., Rebeii, M., Ayari, M., Belhadj, M., Ben Hmida, M., Boughattas, M., Drissa, M., El Ghardallou, M., Fejjeri, M., Hamza, M., Jaidane, M., Jrad, M., Kacem, M., Mersni, M., Mjid, M., Serghini, M., Triki, M., Ben Abbes, M., Boussaid, M., Gharbi, M., Hafi, M., Slama, M., Trigui, M., Taoueb, M., Chakroun, M., Ben Cheikh, M., Chebbi, M., Hadj Taieb, M., Ben Khelil, M., Hammami, M., Khalfallah, M., Ksiaa, M., Mechri, M., Mrad, M., Sboui, M., Bani, M., Hajri, M., Mellouli, M., Allouche, M., Mesrati, M. A., Mseddi, M. A., Amri, M., Bejaoui, M., Bellali, M., Ben Amor, M., Ben Dhieb, M., Ben Moussa, M., Chebil, M., Cherif, M., Fourati, M., Kahloul, M., Khaled, M., Machghoul, M., Mansour, M., Abdesslem, M. M., Ben Chehida, M. A., Chaouch, M. A., Essid, M. A., Meddeb, M. A., Gharbi, M. C., Elleuch, M. H., Loueslati, M. H., Sboui, M. M., Mhiri, M. N., Kilani, M. O., Ben Slama, M. R., Charfi, M. R., Nakhli, M. S., Mourali, M. S., El Asli, M. S., Lamouchi, M. T., Cherti, M., Khadhraoui, M., Bibi, M., Hamdoun, M., Kassis, M., Touzi, M., Ben Khaled, M., Fekih, M., Khemiri, M., Ouederni, M., Hchicha, M., Ben Attia, M., Yahyaoui, M., Ben Azaiez, M., Bousnina, M., Ben Jemaa, M., Ben Yahia, M., Daghfous, M., Haj Slimen, M., Assidi, M., Belhadj, N., Ben Mustapha, N., El Idrissislitine, N., Hikki, N., Kchir, N., Mars, N., Meddeb, N., Ouni, N., Rada, N., Rezg, N., Trabelsi, N., Bouafia, N., Haloui, N., Benfenatki, N., Bergaoui, N., Yomn, N., Maamouri, N., Mehiri, N., Siala, N., Beltaief, N., Aridhi, N., Sidaoui, N., Walid, N., Mechergui, N., Mnif, N., Ben Chekaya, N., Bellil, N., Dhouib, N., Achour, N., Kaabar, N., Mrizak, N., Chaouech, N., Hasni, N., Issaoui, N., Ati, N., Balloumi, N., Haj Salem, N., Ladhari, N., Akif, N., Liani, N., Hajji, N., Trad, N., Elleuch, N., Marzouki, N. E. H., Larbi, N., M Barek, N., Rebai, N., Bibani, N., Ben Salah, N., Belmaachi, O., Elmaalel, O., Jlassi, O., Mihoub, O., Ben Zaid, O., Bouallègue, O., Bousnina, O., Bouyahia, O., El Maalel, O., Fendri, O., Azzabi, O., Borgi, O., Ghdes, O., Ben Rejeb, O., Rachid, R., Abi, R., Bahiri, R., Boulma, R., Elkhayat, R., Habbal, R., Tamouza, R., Jomli, R., Ben Abdallah, R., Smaoui, R., Debbeche, R., Fakhfakh, R., El Kamel, R., Gargouri, R., Jouini, R., Nouira, R., Fessi, R., Bannour, R., Ben Rabeh, R., Kacem, R., Khmakhem, R., Ben Younes, R., Karray, R., Cheikh, R., Ben Malek, R., Ben Slama, R., Kouki, R., Baati, R., Bechraoui, R., Fradi, R., Lahiani, R., Ridha, R., Zainine, R., Kallel, R., Rostom, S., Ben Abdallah, S., Ben Hammamia, S., Benchérifa, S., Benkirane, S., Chatti, S., El Guedri, S., El Oussaoui, S., Elkochri, S., Elmoussaoui, S., Enbili, S., Gara, S., Haouet, S., Khammeri, S., Khefecha, S., Khtrouche, S., Macheghoul, S., Mallouli, S., Rharrit, S., Skouri, S., Helali, S., Boulehmi, S., Abid, S., Naouar, S., Zelfani, S., Ben Amar, S., Ajmi, S., Braiek, S., Yahiaoui, S., Ghezaiel, S., Ben Toumia, S., Thabeti, S., Daboussi, S., Ben Abderahman, S., Rhaiem, S., Ben Rhouma, S., Rekaya, S., Haddad, S., Kammoun, S., Merai, S., Mhamdi, S., Ben Ali, R., Gaaloul, S., Ouali, S., Taleb, S., Zrour, S., Hamdi, S., Zaghdoudi, S., Ammari, S., Ben Abderrahim, S., Karaa, S., Maazaoui, S., Saidani, S., Stambouli, S., Mokadem, S., Boudiche, S., Zaghbib, S., Ayedi, S., Jardek, S., Bouselmi, S., Chtourou, S., Manoubi, S., Bahri, S., Halioui, S., Jrad, S., Mazigh, S., Ouerghi, S., Toujani, S., Fenniche, S., Aboudrar, S., Meriem Amari, S., Karouia, S., Bourgou, S., Halayem, S., Rammeh, S., Yaïch, S., Ben Nasrallah, S., Chouchane, S., Ftini, S., Makni, S., Miri, S., Saadi, S., Manoubi, S. A., Khalfallah, T., Mechergui, T., Dakka, T., Barhoumi, T., M Rad, T. E. B., Ajmi, T., Dorra, T., Ouali, U., Hannachi, W., Ferjaoui, W., Aissi, W., Dahmani, W., Dhouib, W., Koubaa, W., Zhir, W., Gheriani, W., Arfa, W., Dougaz, W., Sahnoun, W., Naija, W., Sami, Y., Bouteraa, Y., Elhamdaoui, Y., Hama, Y., Ouahchi, Y., Guebsi, Y., Nouira, Y., Daly, Y., Mahjoubi, Y., Mejdoub, Y., Mosbahi, Y., Said, Y., Zaimi, Y., Zgueb, Y., Dridi, Y., Mesbahi, Y., Gharbi, Y., Hellal, Y., Hechmi, Z., Zid, Z., Elmouatassim, Z., Ghorbel, Z., Habbadi, Z., Marrakchi, Z., Hidouri, Z., Abbes, Z., Ouhachi, Z., Khessairi, Z., Khlayfia, Z., Mahjoubi, Z., and Moatemri, Z.

46. Prevention of Male Late-Onset Hypogonadism by Natural Polyphenolic Antioxidants.

Author

Martin LJ and Touaibia M

Subjects
Male, Humans, Leydig Cells drug effects, Leydig Cells metabolism, Animals, Aging drug effects, Phosphoproteins metabolism, Resveratrol pharmacology, Hypogonadism drug therapy, Antioxidants pharmacology, Polyphenols pharmacology, Testosterone metabolism
Abstract

Androgen production primarily occurs in Leydig cells located in the interstitial compartment of the testis. In aging males, testosterone is crucial for maintaining muscle mass and strength, bone density, sexual function, metabolic health, energy levels, cognitive function, as well as overall well-being. As men age, testosterone production by Leydig cells of the testes begins to decline at a rate of approximately 1% per year starting from their 30s. This review highlights recent findings concerning the use of natural polyphenolics compounds, such as flavonoids, resveratrol, and phenolic acids, to enhance testosterone production, thereby preventing age-related degenerative conditions associated with testosterone insufficiency. Interestingly, most of the natural polyphenolic antioxidants having beneficial effects on testosterone production tend to enhance the expression of the steroidogenic acute regulatory protein ( Star ) gene in Leydig cells. The STAR protein facilitates the entry of the steroid precursor cholesterol inside mitochondria, a rate-limiting step for androgen biosynthesis. Natural polyphenolic compounds can also improve the activities of steroidogenic enzymes, hypothalamus-pituitary gland axis signaling, and testosterone bioavailability. Thus, many polyphenolic compounds such as luteolin, quercetin, resveratrol, ferulic acid phenethyl ester or gigantol may be promising in delaying the initiation of late-onset hypogonadism accompanying aging in males.

Published
2024
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47. Single and multiple inhibitors of the biosynthesis of 5-, 12-, 15-lipoxygenase products derived from cinnamyl-3,4-dihydroxy-α-cyanocinnamate: Synthesis and structure-activity relationship.

Author

Touaibia M, Chiasson AI, Robichaud S, Doiron JA, Hébert MPA, and Surette ME

Subjects
Molecular Docking Simulation, Structure-Activity Relationship, Arachidonate 15-Lipoxygenase, Cinnamates, Hydroxyurea analogs & derivatives
Abstract

The involvement of lipoxygenases in various pathologies, combined with the unavailability of safe and effective inhibitors of the biosynthesis of their products, is a source of inspiration for the development of new inhibitors. Based on a structural analysis of known inhibitors of lipoxygenase products biosynthesis, a comprehensive structure-activity study was carried out, which led to the discovery of several novel compounds (16a-c, 17a) demonstrating promising potency to inhibit the biosynthesis of products of 5-, 12- and 15-LO. Compounds 16b and 16c outperformed zileuton (1), the only FDA-approved 5-LO inhibitor, as well as known inhibitors such as caffeic acid phenethyl ester (CAPE (2)) and cinnamyl-3,4-dihydroxy-α-cyanocinnamate (CDC (4)). However, the introduction of a cyano group at the α-position of the carbonyl abolished the activity. Compounds 16a and 17a also inhibited the biosynthesis of 12- and 15-LO products. Compounds 16a, 17a far surpassed baicalein, a known 12-LO inhibitor, as inhibitors of 12-LO products biosynthesis. Compound 17a and CDC (4) showed equivalent inhibition of LO products, proposing that the double bond in the ester moiety is not necessary for the inhibitory activity. The introduction of the cyano group, as in compound 17a, at the α-position of the carbonyl in compound 16a significantly reduced the inhibitory activity against the biosynthesis of 15-LO products. In addition to the interactions with residues His372 and Phe421 also found with zileuton and CAPE, compounds 16a and 16c each interact with residue His367 as shown by molecular docking. This new interaction may explain their high affinity with the 5-LO active site., (© 2024 Wiley Periodicals LLC.)

Published
2024
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48. Effects of Red Sorghum-Derived Deoxyanthocyanidins and Their O-β-D-Glucosides on E-Cadherin Promoter Activity in PC-3 Prostate Cancer Cells.

Author

Mora N, Rosa M, Touaibia M, and Martin LJ

Subjects
Humans, Male, Antigens, CD metabolism, Antigens, CD genetics, Cell Line, Tumor, Cell Survival drug effects, Gene Expression Regulation, Neoplastic drug effects, NF-kappa B metabolism, PC-3 Cells, Anthocyanins pharmacology, Anthocyanins chemistry, Cadherins drug effects, Cadherins genetics, Cadherins metabolism, Glucosides pharmacology, Glucosides chemistry, Promoter Regions, Genetic drug effects, Prostatic Neoplasms drug therapy, Prostatic Neoplasms metabolism, Prostatic Neoplasms pathology, Prostatic Neoplasms genetics, Sorghum chemistry
Abstract

Although much less common than anthocyanins, 3-Deoxyanthocyanidins (3-DAs) and their glucosides can be found in cereals such as red sorghum. It is speculated that their bioavailability is higher than that of anthocyanins. Thus far, little is known regarding the therapeutic effects of 3-DAs and their O-β-D-glucosides on cancer, including prostate cancer. Thus, we evaluated their potential to decrease cell viability, to modulate the activity of transcription factors such as NFκB, CREB, and SOX, and to regulate the expression of the gene CDH1 , encoding E-Cadherin. We found that 4',7-dihydroxyflavylium chloride (P7) and the natural apigeninidin can reduce cell viability, whereas 4',7-dihydroxyflavylium chloride (P7) and 4'-hydroxy-7-O-β-D-glucopyranosyloxyflavylium chloride (P3) increase the activities of NFkB, CREB, and SOX transcription factors, leading to the upregulation of CDH1 promoter activity in PC-3 prostate cancer cells. Thus, these compounds may contribute to the inhibition of the epithelial-to-mesenchymal transition in cancer cells and prevent the metastatic activity of more aggressive forms of androgen-resistant prostate cancer.

Published
2024
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49. Algerian Propolis from Distinct Geographical Locations: Chemical Profiles, Antioxidant Capacity, Cytotoxicity and Inhibition of 5-Lipoxygenase Product Biosynthesis.

Author

Ayad AS, Hébert MPA, Doiron JA, Loucif-Ayad W, Daas T, Smagghe G, Alburaki M, Barnett DA, Touaibia M, and Surette ME

Subjects
Animals, Humans, Arachidonate 5-Lipoxygenase, Plant Extracts chemistry, Phenols pharmacology, Flavonoids pharmacology, Antioxidants pharmacology, Antioxidants chemistry, Propolis pharmacology, Propolis chemistry
Abstract

Propolis was collected from honeybee hives in three geographically distinct Algerian climates and extracts were characterized for composition and bioactivity. Bees were identified as native subspecies using an in-silico DraI mtDNA COI-COII test. Over 20 compounds were identified in extracts by LC-MS. Extracts from the Medea region were more enriched in phenolic content (302±28 mg GAE/g of dry extract) than those from Annaba and Ghardaia regions. Annaba extracts had the highest flavonoid content (1870±385 mg QCE/g of dry extract). Medea extracts presented the highest free-radical scavenging activity (IC 50 =13.5 μg/mL) using the DPPH radical assay while Ghardaia extracts from the desert region were weak (IC 50 >100 μg/mL). Antioxidant activities measured using AAPH oxidation of linoleic acid were similar in all extracts with IC 50 values ranging from 2.9 to 4.9 μg/mL. All extracts were cytotoxic (MTT assay) and proapoptotic (Annexin-V) against human leukemia cell lines in the low μg/mL range, although the Annaba extract was less active against the Reh cell line. Extracts inhibited cellular 5-lipoxygenase product biosynthesis with IC 50 values ranging from 0.6 to 3.2 μg/mL. Overall, examined propolis extracts exhibited significant biological activity that warrant further characterization in cellular and in vivo models., (© 2024 The Authors. Chemistry & Biodiversity published by Wiley‐VHCA AG.)

Published
2024
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50. Resilience and phenotypic plasticity of Arctic char ( Salvelinus alpinus ) facing cyclic hypoxia: insights into growth, energy stores and hepatic metabolism.

Author

Ducros L, Touaibia M, Pichaud N, and Lamarre SG

Abstract

Arctic char ( Salvelinus alpinus ) is facing the decline of its southernmost populations due to several factors including rising temperatures and eutrophication. These conditions are also conducive to episodes of cyclic hypoxia, another possible threat to this species. In fact, lack of oxygen and reoxygenation can both have serious consequences on fish as a result of altered ATP balance and an elevated risk of oxidative burst. Thus, fish must adjust their phenotype to survive and equilibrate their energetic budget. However, their energy allocation strategy could imply a reduction in growth which could be deleterious for their fitness. Although the impact of cyclic hypoxia is a major issue for ecosystems and fisheries worldwide, our knowledge on how salmonid deal with high oxygen fluctuations remains limited. Our objective was to characterize the effects of cyclic hypoxia on growth and metabolism in Arctic char. We monitored growth parameters (specific growth rate, condition factor), hepatosomatic and visceral indexes, relative heart mass and hematocrit of Arctic char exposed to 30 days of cyclic hypoxia. We also measured the hepatic protein synthesis rate, hepatic triglycerides as well as muscle glucose, glycogen and lactate and quantified hepatic metabolites during this treatment. The first days of cyclic hypoxia slightly reduce growth performance with a downward trend in specific growth rate in mass and condition factor variation compared to the control group. This acute exposure also induced a profound metabolome reorganization in the liver with an alteration of amino acid, carbohydrate and lipid metabolisms. However, fish rebalanced their metabolic activities and successfully maintained their growth and energetic reserves after 1 month of cyclic hypoxia. These results demonstrate the impressive ability of Arctic char to cope with its changing environment but also highlight a certain vulnerability of this species during the first days of a cyclic hypoxia event., Competing Interests: The authors declare no competing or financial interest., (© The Author(s) 2023. Published by Oxford University Press and the Society for Experimental Biology.)

Published
2023
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