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Titre : Effect of bioactive molecules extracted from medicinal plants on inflammation induced by hyperhomocysteinemia and tumoral process Type de document : texte imprimé Auteurs : Assia Benmebarek, Auteur ; S Zerizer, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2014 Importance : 231 f. Note générale : 2 copies imprimées disponibles
Langues : Anglais (eng) Tags : Hyperhomocysteinemia atherogenesis inflammation carcinogenesis Stachys mialhesi Stachys ocymastrum immunomodulatory activity Hyperhomocysteinémie athérogénèse carcinogénèse activité immunomodulatrice ????? ???????????? ???????? ???? ???????? ???????? ??????? ??????? ??????? Index. décimale : 570 Sciences de la vie. Biologie Résumé : Hyperhomocysteinemia is an important risk factor in cardiovascular diseases and may also be implicated in cancer biology. Elevated plasma homocysteine (Hcy) levels may mediate long-term oxidative damage at the vascular interface and there appear to be a mechanism by which they may also be carcinogenic. In addition, immunostimulatory therapy is one solution to enhance the immunity, however, the immunopharmacologic activities of herbal extracts may be antagonistic, they can be immunosupressive or immunostimulating. In the present study, we evaluated the in vivo effect of S. mialhesi extract on the inflammation induced by hyperhomocysteinemia and damages induced to the aorta, heart, liver, thymus and spleen. Another study was carried on the immunomodulatory potential of S. mialhesi
and S. ocymastrum on the phagocytic activity which was evaluated using the Carbon Clearance Assay. The results obtained showed that plasma hs-CRP concentrations were elevated significantly after the administration of L-methionine in high doses to mice (200mg/kg). Also, the loss and degeneration of endothelium, fenestration, foam cells formation, and a change in the appearance of smooth muscle cells nuclei from a fusiform nuclei aspect to a rounded one, were observed in the media of the aorta as well as the alteration of the cardiac muscle, liver necrosis, lymphocytes membrane destruction in the thymus, and a hypertrophy of the spleen white pulp. Our research also revealed that at different doses, S. mialhesi extract increased the reticuloendothelial system (RES)
phagocytic activity in a dose dependant manner, in contrast to S. ocymastrum who exhibited a biphasic dose response effect. Hcy initiated inflammation and mediated early atherogenesis lesions through increased oxidant stress, and the treatment with S. mialhesi extract at a dose of (50mg/kg) prevented the alterations. Also, S. mialhesi extract exhibited a dose-dependent immunostimulatory effect on the RES and S. ocymastrum extract appeared immunostimulatory at low concentrations and immunosuppressive at high concentrations. Moreover, in the present thesis, we performed a review study which demonstrated that Hcy may mediate carcinogenesis namely through folate deficiency, oxidative stress, aberrant DNA methylation and the production of homocysteine thiolactone.
Diplôme : Doctorat En ligne : ../theses/biologie/BEN6973.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10371 Effect of bioactive molecules extracted from medicinal plants on inflammation induced by hyperhomocysteinemia and tumoral process [texte imprimé] / Assia Benmebarek, Auteur ; S Zerizer, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2014 . - 231 f.
2 copies imprimées disponibles
Langues : Anglais (eng)
Tags : Hyperhomocysteinemia atherogenesis inflammation carcinogenesis Stachys mialhesi Stachys ocymastrum immunomodulatory activity Hyperhomocysteinémie athérogénèse carcinogénèse activité immunomodulatrice ????? ???????????? ???????? ???? ???????? ???????? ??????? ??????? ??????? Index. décimale : 570 Sciences de la vie. Biologie Résumé : Hyperhomocysteinemia is an important risk factor in cardiovascular diseases and may also be implicated in cancer biology. Elevated plasma homocysteine (Hcy) levels may mediate long-term oxidative damage at the vascular interface and there appear to be a mechanism by which they may also be carcinogenic. In addition, immunostimulatory therapy is one solution to enhance the immunity, however, the immunopharmacologic activities of herbal extracts may be antagonistic, they can be immunosupressive or immunostimulating. In the present study, we evaluated the in vivo effect of S. mialhesi extract on the inflammation induced by hyperhomocysteinemia and damages induced to the aorta, heart, liver, thymus and spleen. Another study was carried on the immunomodulatory potential of S. mialhesi
and S. ocymastrum on the phagocytic activity which was evaluated using the Carbon Clearance Assay. The results obtained showed that plasma hs-CRP concentrations were elevated significantly after the administration of L-methionine in high doses to mice (200mg/kg). Also, the loss and degeneration of endothelium, fenestration, foam cells formation, and a change in the appearance of smooth muscle cells nuclei from a fusiform nuclei aspect to a rounded one, were observed in the media of the aorta as well as the alteration of the cardiac muscle, liver necrosis, lymphocytes membrane destruction in the thymus, and a hypertrophy of the spleen white pulp. Our research also revealed that at different doses, S. mialhesi extract increased the reticuloendothelial system (RES)
phagocytic activity in a dose dependant manner, in contrast to S. ocymastrum who exhibited a biphasic dose response effect. Hcy initiated inflammation and mediated early atherogenesis lesions through increased oxidant stress, and the treatment with S. mialhesi extract at a dose of (50mg/kg) prevented the alterations. Also, S. mialhesi extract exhibited a dose-dependent immunostimulatory effect on the RES and S. ocymastrum extract appeared immunostimulatory at low concentrations and immunosuppressive at high concentrations. Moreover, in the present thesis, we performed a review study which demonstrated that Hcy may mediate carcinogenesis namely through folate deficiency, oxidative stress, aberrant DNA methylation and the production of homocysteine thiolactone.
Diplôme : Doctorat En ligne : ../theses/biologie/BEN6973.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10371 Exemplaires
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Titre : Biological activities of Phoenix dactylifera and Treg in Rheumatoid arthritis induced by hyperhomocysteinemia and formalin and on tumoral process Type de document : texte imprimé Auteurs : Houssem Eddine Kehili, Auteur ; sakina Zerizer, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 173 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Anglais (eng) Tags : Phoenix dactylifera activité immunomodulatrice glutathion réduit inflammation hyperhomocystéinémie activité anti-arthrite cancer immunomodulatory activity GSH glutathione hyperhomocysteinemia anti-arthritis activity ????? dactylifera Phoenix ?????? ??????? ?????????GSH ???????? ??? ???????????? ???? ?????? ??????? ??????? Index. décimale : 570 Sciences de la vie. Biologie Résumé : Inflammation plays an important role in various diseases, such as rheumatoid arthritis, atherosclerosis and asthma, which all show a high prevalence globally and the absence of the immune tolerance which is insured by the lymphocyte Treg. This tolerance protects the selfantigens from the immune system’s reaction. In addition, some chronic inflammatory diseases are recently found to be associated with an increased levels of hs-CRP and plasma homocysteine.
In the present study, we evaluated the in vivo, the effect of two varieties of Phoenix
dactylifera (Azarza variety grown in Ghardaia and variety Homayra grown in Adrar) on the toxicity using the up and down test, the immunomodulatory activity of the extracts using the carbon clearance from the blood, antioxidant by the measurement of the GSH from liver’s homogenate, anti-inflammatory activity and anti-arthritis by the formalin and L-methionine test in Albino mice. Also we have carried a study in vitro to establish the anti-proliferative effect of the methanolic and acetone extracts dates on liver cancer cell line (HepG2), breast cancer cell line (MCF7) and healthy cells, endothelial cells (HUVEC) and hepatocytes (hNHEPS). In addition to this work, we tested the effect of Phoenix dactylifera extracts on apoptotic genes (Bcl2 and BAX) and on the differentiation of human naïve lymphocyte T CD4+ into regulatory lymphocytes Treg.
The results showed that the extracts of Phoenix dactylifera have no toxic effect at a
dose of 2000mg/kg, also we found that the extracts increased significantly the phagocytic activity of the reticuloendothelial system, and release of glutathione reduced (GSH) from the liver. Furthermore, the extracts of Phoenix dactylifera studied reveal correction on the inflammation associated with hyperhomocysteinemia presented by a significant decrease in the size of the edema induced by formalin injection and a significant decrease in the hs- CRPvalues and homocysteine Hcy (p ≤ 0.05) in mice treated compared to controls, where it was observed that the administration of L-methionine 400 mg/kg caused a worsening of inflammation presented by a significant increase in protein C-reactive (CRP) p≤0,05 and a significant increase in homocysteine (Hcy) p≤0,05. Our results demonstrate a significant inhibition of edema of mice paws treated with our extracts with a decrease in the Anti-CCP values.
The results indicate that treatment with six different concentrations (2 mg/100mL, 4
mg/100mL, 7.5 mg/100mL, 8 mg/100mL, 16 mg/1 00mL and 20 mg/100mL) inhibited the
growth of tumor cells but had no toxicity to healthy cells.
Diplôme : Doctorat En ligne : ../theses/biologie/KEH6985.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10409 Biological activities of Phoenix dactylifera and Treg in Rheumatoid arthritis induced by hyperhomocysteinemia and formalin and on tumoral process [texte imprimé] / Houssem Eddine Kehili, Auteur ; sakina Zerizer, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2016 . - 173 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Anglais (eng)
Tags : Phoenix dactylifera activité immunomodulatrice glutathion réduit inflammation hyperhomocystéinémie activité anti-arthrite cancer immunomodulatory activity GSH glutathione hyperhomocysteinemia anti-arthritis activity ????? dactylifera Phoenix ?????? ??????? ?????????GSH ???????? ??? ???????????? ???? ?????? ??????? ??????? Index. décimale : 570 Sciences de la vie. Biologie Résumé : Inflammation plays an important role in various diseases, such as rheumatoid arthritis, atherosclerosis and asthma, which all show a high prevalence globally and the absence of the immune tolerance which is insured by the lymphocyte Treg. This tolerance protects the selfantigens from the immune system’s reaction. In addition, some chronic inflammatory diseases are recently found to be associated with an increased levels of hs-CRP and plasma homocysteine.
In the present study, we evaluated the in vivo, the effect of two varieties of Phoenix
dactylifera (Azarza variety grown in Ghardaia and variety Homayra grown in Adrar) on the toxicity using the up and down test, the immunomodulatory activity of the extracts using the carbon clearance from the blood, antioxidant by the measurement of the GSH from liver’s homogenate, anti-inflammatory activity and anti-arthritis by the formalin and L-methionine test in Albino mice. Also we have carried a study in vitro to establish the anti-proliferative effect of the methanolic and acetone extracts dates on liver cancer cell line (HepG2), breast cancer cell line (MCF7) and healthy cells, endothelial cells (HUVEC) and hepatocytes (hNHEPS). In addition to this work, we tested the effect of Phoenix dactylifera extracts on apoptotic genes (Bcl2 and BAX) and on the differentiation of human naïve lymphocyte T CD4+ into regulatory lymphocytes Treg.
The results showed that the extracts of Phoenix dactylifera have no toxic effect at a
dose of 2000mg/kg, also we found that the extracts increased significantly the phagocytic activity of the reticuloendothelial system, and release of glutathione reduced (GSH) from the liver. Furthermore, the extracts of Phoenix dactylifera studied reveal correction on the inflammation associated with hyperhomocysteinemia presented by a significant decrease in the size of the edema induced by formalin injection and a significant decrease in the hs- CRPvalues and homocysteine Hcy (p ≤ 0.05) in mice treated compared to controls, where it was observed that the administration of L-methionine 400 mg/kg caused a worsening of inflammation presented by a significant increase in protein C-reactive (CRP) p≤0,05 and a significant increase in homocysteine (Hcy) p≤0,05. Our results demonstrate a significant inhibition of edema of mice paws treated with our extracts with a decrease in the Anti-CCP values.
The results indicate that treatment with six different concentrations (2 mg/100mL, 4
mg/100mL, 7.5 mg/100mL, 8 mg/100mL, 16 mg/1 00mL and 20 mg/100mL) inhibited the
growth of tumor cells but had no toxicity to healthy cells.
Diplôme : Doctorat En ligne : ../theses/biologie/KEH6985.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10409 Exemplaires
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Titre : L’effet protecteur de la plante Linaria tingitana (Scrophulariaceae) sur le dysfonctionnement mitochondrial et lysosomal hépatocytaire induit par l’acide valproïque chez le rat. Type de document : texte imprimé Auteurs : Mourad Hanfer, Auteur ; Souad Ameddah, Directeur de thèse ; Didier Morin, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 202 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Valproïc acid Linaria tingitana LC-MS. Mitochondrial dysfunction Lysosomal dysfunction Rats HepG2 Inflammation Oxidative stress Acide valproïque LC-MS. Dysfonctionnement mitochondrial Dysfonctionnement lysosomal Stress oxydant Index. décimale : 570 Sciences de la vie. Biologie Résumé : This investigation is interested to study the modulator effect of Linaria tingitana in rats
treated by the valproic acid (VPA). The in vitro studies (DPPH◦, FRAP, β-carotene, Chelation, NO◦) showed that Linaria tingitana is endowed with an antioxidant property. The antiinflammatory studies (albumin denaturation, HRBC, NO scavenger, oedema and peritonitis led
by the carrageenan, the rise of MPO and the infiltration of the PN) confirmed that Linaria
tingitana has a beneficial effect in this sense. The in vivo studies made to rats handled by the
VPA revealed that the n-BuOH extract acts by a multitude of mechanisms: conservation of the
hepatic function, the modulation of the steatoses, the neutralization of the oxidative stress and
the reduction of the inflammation hepatocyte elucidated by the decrease of the activity MPO.
Antirrhides molecules isolated of this plant were ineffective at the level of the cell line HepG2
treated with the VPA. The mitochondrial dysfunction led by the VPA is expressed by the decrease of the RCR accompanied by a decrease of the activity of the complex I. The n-BuOH
extract as well as the isolated molecules managed to reduce the mitochondrial H2O2 and to modulate the antioxidant mitochondrial and lysosomal systems. The conservation of the integrity
lysosomal membrane was more pronounced by the n-BuOH extract compared to the vitamin
E. The various modulator ways of L. tingitana delayed the appearance of the complications
linked to the mitochondrial dysfunction, lysosomal, such necrosis. Probably this is due to the
diversified wealth of this plant in term of polyphenols and irridoids revealed by phytochemical
screening and the analysis of the LC-MS and in the synergetic effect of the molecules that it
contains.Diplôme : Doctorat En ligne : ../theses/biologie/HAN7131.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10471 L’effet protecteur de la plante Linaria tingitana (Scrophulariaceae) sur le dysfonctionnement mitochondrial et lysosomal hépatocytaire induit par l’acide valproïque chez le rat. [texte imprimé] / Mourad Hanfer, Auteur ; Souad Ameddah, Directeur de thèse ; Didier Morin, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 202 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Valproïc acid Linaria tingitana LC-MS. Mitochondrial dysfunction Lysosomal dysfunction Rats HepG2 Inflammation Oxidative stress Acide valproïque LC-MS. Dysfonctionnement mitochondrial Dysfonctionnement lysosomal Stress oxydant Index. décimale : 570 Sciences de la vie. Biologie Résumé : This investigation is interested to study the modulator effect of Linaria tingitana in rats
treated by the valproic acid (VPA). The in vitro studies (DPPH◦, FRAP, β-carotene, Chelation, NO◦) showed that Linaria tingitana is endowed with an antioxidant property. The antiinflammatory studies (albumin denaturation, HRBC, NO scavenger, oedema and peritonitis led
by the carrageenan, the rise of MPO and the infiltration of the PN) confirmed that Linaria
tingitana has a beneficial effect in this sense. The in vivo studies made to rats handled by the
VPA revealed that the n-BuOH extract acts by a multitude of mechanisms: conservation of the
hepatic function, the modulation of the steatoses, the neutralization of the oxidative stress and
the reduction of the inflammation hepatocyte elucidated by the decrease of the activity MPO.
Antirrhides molecules isolated of this plant were ineffective at the level of the cell line HepG2
treated with the VPA. The mitochondrial dysfunction led by the VPA is expressed by the decrease of the RCR accompanied by a decrease of the activity of the complex I. The n-BuOH
extract as well as the isolated molecules managed to reduce the mitochondrial H2O2 and to modulate the antioxidant mitochondrial and lysosomal systems. The conservation of the integrity
lysosomal membrane was more pronounced by the n-BuOH extract compared to the vitamin
E. The various modulator ways of L. tingitana delayed the appearance of the complications
linked to the mitochondrial dysfunction, lysosomal, such necrosis. Probably this is due to the
diversified wealth of this plant in term of polyphenols and irridoids revealed by phytochemical
screening and the analysis of the LC-MS and in the synergetic effect of the molecules that it
contains.Diplôme : Doctorat En ligne : ../theses/biologie/HAN7131.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10471 Exemplaires
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Titre : Recherche et évaluation des effets d’un extrait aqueux de gastéropode du genre Helix (Helix aspersa) sur quelques voies de bio signalisation dans la réponse immunitaire inflammatoire et anti tumorale Type de document : texte imprimé Auteurs : Ibtissem El Ouar, Auteur ; Dalila Naimi, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2014 Importance : 181 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Helix aspersa anti oxydant inflammation prolifération tumorale TNF? BcL2 NF-
?B P53 PTEN apoptose nécrose tumor proliferation apoptosis necrosis ?????? ???? ??????? ????? ??????? ?????????Index. décimale : 570 Sciences de la vie. Biologie Résumé :
The treatment of cancer is basically on synthetics and chemotherapeutics; these kinds of
treatment cause various harmful side effects to human beings. For this reason the search for new natural and safe drugs is the aim of the different laboratories in the word. Plant and marine species are the major source of natural drugs; few researches have been interested in purifying bioactive molecules from other terrestrial consumed species like snails. The aim of our study is to test the anti tumor and the immuno-modulatory effect of an aqueous extract from Helix aspersa. The garden snail is a big land snail found widely in the Mediterranean countries, it is one of the most consumed species and widely used in zootherapy. Firstly, we have interest to test the anti oxidant propriety by chemical methods. Then we have tested its effect in vitro on the tow cell lines THP1 and Hs578T In vivo the extract’s effects have been explored on a model of chronic of inflammatory response, induced in mice by lipopolysaccharides from Escherichia coli. The results show that, H. aspersa extract have an anti-oxydant effect at high dose, it can reduce the radical DPPH and Fe3+ ions. It can scavenge peroxyde hydrogen and inhibits lipid peroxidation. The extract has also an anti tumor effect on breast cancer cells Hs578T. The data demonstrate that it induces a programmed necrosis in tumour cells. It enhances significantly the expression of TNFα. The mRNA level of the cytokine was 20 times more important in treated cells compared to non treated cells. Our extract is a good inhibitor of BcL2 and NF-κB. It inhibits also the expression of tumor suppressor genes P53 and PTENDiplôme : Doctorat en sciences En ligne : ../theses/biologie/ELO6613.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9733 Recherche et évaluation des effets d’un extrait aqueux de gastéropode du genre Helix (Helix aspersa) sur quelques voies de bio signalisation dans la réponse immunitaire inflammatoire et anti tumorale [texte imprimé] / Ibtissem El Ouar, Auteur ; Dalila Naimi, Directeur de thèse . - constantine (Route ain el bey, Algérie) : Université Constantine 1, 2014 . - 181 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Helix aspersa anti oxydant inflammation prolifération tumorale TNF? BcL2 NF-
?B P53 PTEN apoptose nécrose tumor proliferation apoptosis necrosis ?????? ???? ??????? ????? ??????? ?????????Index. décimale : 570 Sciences de la vie. Biologie Résumé :
The treatment of cancer is basically on synthetics and chemotherapeutics; these kinds of
treatment cause various harmful side effects to human beings. For this reason the search for new natural and safe drugs is the aim of the different laboratories in the word. Plant and marine species are the major source of natural drugs; few researches have been interested in purifying bioactive molecules from other terrestrial consumed species like snails. The aim of our study is to test the anti tumor and the immuno-modulatory effect of an aqueous extract from Helix aspersa. The garden snail is a big land snail found widely in the Mediterranean countries, it is one of the most consumed species and widely used in zootherapy. Firstly, we have interest to test the anti oxidant propriety by chemical methods. Then we have tested its effect in vitro on the tow cell lines THP1 and Hs578T In vivo the extract’s effects have been explored on a model of chronic of inflammatory response, induced in mice by lipopolysaccharides from Escherichia coli. The results show that, H. aspersa extract have an anti-oxydant effect at high dose, it can reduce the radical DPPH and Fe3+ ions. It can scavenge peroxyde hydrogen and inhibits lipid peroxidation. The extract has also an anti tumor effect on breast cancer cells Hs578T. The data demonstrate that it induces a programmed necrosis in tumour cells. It enhances significantly the expression of TNFα. The mRNA level of the cytokine was 20 times more important in treated cells compared to non treated cells. Our extract is a good inhibitor of BcL2 and NF-κB. It inhibits also the expression of tumor suppressor genes P53 and PTENDiplôme : Doctorat en sciences En ligne : ../theses/biologie/ELO6613.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9733 Exemplaires
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Titre : Caractérisation et étude des propriétés immunomodulatrices, anti-inflammatoires et anti-tumorales des molécules bioactives extraites d’Helix aspersa : application dans la prévention du cancer colorectal expérimental chimio induit. Type de document : texte imprimé Auteurs : Meriem Kouachi, Auteur ; Dalila Naimi, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 125 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles.
Langues : Français (fre) Tags : Helix aspersa bave homogénat extrait aqueux immunostimulation inflammation prolifération tumorale slime homogenate aqueous extract tumor proliferation ??????? ?????? ?????? ????? ????? ?????? ?????? ?????????? ?????? ??? Index. décimale : 570 Sciences de la vie. Biologie Résumé : A competent immune system is capable of detecting and eliminating not only viruses and bacteria, but also cancer cells. However, these cells can develop an escape strategy allowing the formation of malignant tumor following immunosuppression. It is therefore necessary to look for new anti-tumor drugs with an immunostimulatory potential. Research in this field focuses on the extraction and purification of these molecules from medicinal plants. However, the aim of our work is to seek and demonstrate the immunomodulatory effect of animal extracts: the Helix aspersa snail, a species widely used and widely consumed in the Mediterranean countries. Our work begins with a characterization of the extracts (slime, homogenate and aqueous extract) and an evaluation of the toxic dose in order to choose the appropriate doses to use during our experiments. The extracts showed no toxicity to experimental animals; Therefore, the doses of 20 ml / Kg of slime, 5 mg / Kg of homogenate and 300 μl / mouse of aqueous extract were chosen. The immunomodulatory effect was shown to be immunostimulatory when performing a carbon clearance test, which led us to investigate other therapeutic effects. Our extracts also exert an anti-inflammatory effect against chemo-induced experimental colitis. Untreated chronic colitis is likely to develop as a colorectal tumor. The anti-inflammatory effect of the extracts prompted us to check the antiproliferative effect. The investigation of the antitumor effect was carried out in vitro, on a culture of MCF7 mammary tumor cells and in vivo, on an experimental chemo-induced colorectal cancer. In vitro experiments showed an inhibition of tumor cell proliferation at 56.39%. In vivo, observation of the histological sections of the colonists confirmed that the extracts repaired the architecture of the colonic mucosa after the installation of the chemoinduced tumor. The Helix aspersa snail has several therapeutic effects. It would therefore be interesting to introduce it into the daily diet as a preventive or supplementary food for a curative purpose.
Diplôme : Doctorat En ligne : ../theses/biologie/KOU7168.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10589 Caractérisation et étude des propriétés immunomodulatrices, anti-inflammatoires et anti-tumorales des molécules bioactives extraites d’Helix aspersa : application dans la prévention du cancer colorectal expérimental chimio induit. [texte imprimé] / Meriem Kouachi, Auteur ; Dalila Naimi, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 125 f. ; 30 cm.
2 copies imprimées disponibles.
Langues : Français (fre)
Tags : Helix aspersa bave homogénat extrait aqueux immunostimulation inflammation prolifération tumorale slime homogenate aqueous extract tumor proliferation ??????? ?????? ?????? ????? ????? ?????? ?????? ?????????? ?????? ??? Index. décimale : 570 Sciences de la vie. Biologie Résumé : A competent immune system is capable of detecting and eliminating not only viruses and bacteria, but also cancer cells. However, these cells can develop an escape strategy allowing the formation of malignant tumor following immunosuppression. It is therefore necessary to look for new anti-tumor drugs with an immunostimulatory potential. Research in this field focuses on the extraction and purification of these molecules from medicinal plants. However, the aim of our work is to seek and demonstrate the immunomodulatory effect of animal extracts: the Helix aspersa snail, a species widely used and widely consumed in the Mediterranean countries. Our work begins with a characterization of the extracts (slime, homogenate and aqueous extract) and an evaluation of the toxic dose in order to choose the appropriate doses to use during our experiments. The extracts showed no toxicity to experimental animals; Therefore, the doses of 20 ml / Kg of slime, 5 mg / Kg of homogenate and 300 μl / mouse of aqueous extract were chosen. The immunomodulatory effect was shown to be immunostimulatory when performing a carbon clearance test, which led us to investigate other therapeutic effects. Our extracts also exert an anti-inflammatory effect against chemo-induced experimental colitis. Untreated chronic colitis is likely to develop as a colorectal tumor. The anti-inflammatory effect of the extracts prompted us to check the antiproliferative effect. The investigation of the antitumor effect was carried out in vitro, on a culture of MCF7 mammary tumor cells and in vivo, on an experimental chemo-induced colorectal cancer. In vitro experiments showed an inhibition of tumor cell proliferation at 56.39%. In vivo, observation of the histological sections of the colonists confirmed that the extracts repaired the architecture of the colonic mucosa after the installation of the chemoinduced tumor. The Helix aspersa snail has several therapeutic effects. It would therefore be interesting to introduce it into the daily diet as a preventive or supplementary food for a curative purpose.
Diplôme : Doctorat En ligne : ../theses/biologie/KOU7168.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10589 Exemplaires
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