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Osman EEA, Shemis MA, Abdel-Hameed ESS, Gouda AE, Hassan H, Atef N, Mamdouh S. Phytoconstituent analysis, anti-inflammatory, antimicrobial and anticancer effects of nano encapsulated Convolvulus arvensis L. extracts. BMC Complement Med Ther 2024; 24:122. [PMID: 38486187 PMCID: PMC10938824 DOI: 10.1186/s12906-024-04420-6] [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] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 02/29/2024] [Indexed: 03/17/2024] Open
Abstract
BACKGROUND The Convolvulus genus is distributed all over the world and has a long history in traditional medicine. As nanotechnology expands its reach into areas like drug delivery and biomedicine, this study intends to assess the potential of Convolvulus arvensis L. extracts as anti-bacterial, anti-inflammatory and anti-cancer agents, along with chemical profiling of the methanolic (MeOH) extract active ingredients. METHODS The chemical composition of an 85% MeOH extract was investigated by liquid chromatography with an electrospray source connected to mass spectrometry (LC-ESI-MS). Both the 85% MeOH extract and n-butanol fraction of C. arvensis were loaded for the first time on alginate/chitosan nanoparticles. The 85% MeOH extract, n-butanol fraction and their loaded nanoparticles were tested for their cytotoxicity, anticancer, anti-inflammatory and antibacterial activity (against pathogenic bacteria, E. coli and S. aureus). RESULTS The chemical investigation of 85% MeOH extract of C. arvensis underwent LC-ESI-MS analysis, revealing twenty-six phenolic substances, of which 16 were phenolic acids, 6 were flavonoids, 1 glycolipid, 1 sesquiterpene and 2 unknown compounds. The FT-IR spectra confirmed the encapsulation of the 85% MeOH extract and n-butanol fraction onto alginate/chitosan nanoparticles and small size obtained by TEM maintained them nontoxic and enhanced their anti-inflammatory activity (the IC50 was decreased from 1050 to 175 µg/ml). The anti-cancer activity against HepG2 was increased and the cell viability was decreased from 28.59 ± 0.52 to 20.80 ± 0.27 at a maximum concentration of 1000 µg/ml. In addition, the MIC of encapsulated extracts was decreased from 31.25 to7.78 µg/ml in E. coli (Gm-ve) and from 15.56 to 7.78 µg/ml in S. aureus (Gm + ve) bacteria. CONCLUSION Both alginate and chitosan are excellent natural polymers for the encapsulation process, which affects positively on the bioactive constituents of C. arvensis extracts and improves their biological properties.
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Affiliation(s)
- Ezzat E A Osman
- Department of Medicinal Chemistry, Theodor Bilharz Research Institute, Kornaish El-Nile St, Giza, 12411, Egypt.
| | - Mohamed A Shemis
- Department of Biochemistry and Molecular Biology, Theodor Bilharz Research Institute, Kornaish El-Nile St, Giza, 12411, Egypt
| | - El-Sayed S Abdel-Hameed
- Department of Medicinal Chemistry, Theodor Bilharz Research Institute, Kornaish El-Nile St, Giza, 12411, Egypt
| | - Abdullah E Gouda
- Department of Biochemistry and Molecular Biology, Theodor Bilharz Research Institute, Kornaish El-Nile St, Giza, 12411, Egypt
| | - Hanem Hassan
- Department of Biochemistry and Molecular Biology, Theodor Bilharz Research Institute, Kornaish El-Nile St, Giza, 12411, Egypt
| | - Nahla Atef
- Air Force Specialized Hospital, Cairo, 19448, Egypt
| | - Samah Mamdouh
- Department of Biochemistry and Molecular Biology, Theodor Bilharz Research Institute, Kornaish El-Nile St, Giza, 12411, Egypt
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Abstract
The hypothalamus participates in the regulation of carbohydrate metabolism involving a feedback loop between the brain and the periphery in which glucose-sensitive hypothalamic areas appear to be involved. We have previously shown that a glucose injection (9 mg/kg) in the carotid artery toward the brain, in an amount that did not modify glycaemia, caused a rapid and transient increase in plasma insulin concentrations. To determine whether central insulin could influence this response, we investigated the change in central glucose-induced insulin secretion in intracerebroventricular (i.c.v) insulin-injected rats and in hyperinsulinaemic obese Zucker rats. Central glucose-induced insulin secretion was increased by 50% in i.c.v. insulin-injected rats compared to control rats. When a similar test was performed at a lower dose of glucose (3 mg/kg), a significant insulin secretion was observed only in rats submitted to a prior central insulin injection. These data indicate an increase in the brain response to glucose after insulin treatment. Using an identical lower glucose dose, we also demonstrated an enhanced brain glucose sensitivity in hyperinsulinaemic and insulin-resistant obese Zucker rats. Together, these results indicate that acute i.c.v. insulin or pathological hyperinsulinaemic state (i.e. obese Zucker rat) modulates the nervous control of insulin secretion by increasing the brain response to glucose.
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Affiliation(s)
- T Alquier
- UMR 5018 CNRS-UPS, IFR 31, CHU Rangueil, Toulouse, France
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Atef N, Laury MC, N'Guyen JM, Mokhtar N, Ktorza A, Penicaud L. Increased pancreatic islet blood flow in 48-hour glucose-infused rats: involvement of central and autonomic nervous systems. Endocrinology 1997; 138:1836-40. [PMID: 9112376 DOI: 10.1210/endo.138.5.5094] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The pancreatic islet blood flow of rats 24 h after a prolonged (48-h) glucose infusion was investigated using a nonradioactive microsphere technique. In the basal state, islet blood flow was significantly increased in previously hyperglycemic rats (HG) compared to that in controls (C). During an i.v. glucose challenge, both plasma insulin and islet blood flow were increased in the two groups, but these increases were significantly higher in HG than in C rats. Although less pronounced, the results were similar when glucose was injected into the carotid artery toward the brain at a dose that did not modify the peripheral glucose level. The effect of this intracarotid injection was abolished after bilateral subdiaphragmatic vagotomy in both C and HG rats. Furthermore, in the latter group, both plasma insulin concentration and islet blood flow returned to values similar to those observed in the basal state in C rats. After pretreatment with the alpha2-adrenoceptor agonist clonidine, the insulin response to the intracarotid glucose load was totally blunted in the two groups of rats. By contrast, whereas such a pretreatment lowered the glucose-induced increase in islet blood flow in C rats, it was without effect in HG rats. These data suggest that a period of hyperglycemia and/or hyperinsulinemia is sufficient to induce a perturbation of pancreatic islet blood flow, which appears to be mainly due to an increased parasympathetic activity, whereas the decrease in sympathetic tone does not play a role. These modifications in autonomic nervous system activity could be due to alterations in some brain areas involved in "glucose sensing."
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Affiliation(s)
- N Atef
- Laboratoire de Physiopathologie de la Nutrition, CNRS URA 307, Université Paris VII, France
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Atef N, Lafontan M, Doublé A, Hélary C, Ktorza A, Pénicaud L. A specific beta 3-adrenoceptor agonist induces increased pancreatic islet blood flow and insulin secretion in rats. Eur J Pharmacol 1996; 298:287-92. [PMID: 8846828 DOI: 10.1016/0014-2999(95)00802-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [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: 02/02/2023]
Abstract
In order to study the role of beta 3-adrenoceptor stimulation on insulin secretion in rats, plasma insulin level and islet blood flow were measured during treatment with CL 316243 which is chemically named disodium (R,R)-5-[2-[[2,3-(3-chlorophenyl)-2-hydroxyethyl]-amino]propyl]-1, 3-benzodioxole-2,2-dicarboxylate, a specific beta 3-adrenoceptor agonist. CL 316243 induced a marked increase in both islet blood flow and plasma insulin concentration without changes in whole pancreatic blood flow. This increase was totally prevented when the rats were pretreated with bupranolol, a beta 1, beta 2, beta 3-adrenoceptor antagonist, but not with nadolol, a beta 1, beta 2-adrenoceptor antagonist. We conclude that beta 3-adrenoceptor stimulation provokes a marked vasodilatation of microvessels in the islets of Langerhans, which in turn could contribute to the increase in insulin secretion.
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Affiliation(s)
- N Atef
- Laboratory of Physiopathology of Nutrition, CNRS URA 307, University Paris VII, France
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Pénicaud L, Cousin B, Leloup C, Atef N, Casteilla L, Ktorza A. Changes in autonomic nervous system activity and consecutive hyperinsulinaemia: respective roles in the development of obesity in rodents. Diabetes Metab 1996; 22:15-24. [PMID: 8697291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The autonomic nervous system plays a major role in metabolism regulation by modulating metabolic pathways directly or indirectly via control of hormone (particularly insulin) secretion in various organs and tissues. In addition, the system modulates the proliferation and differentiation of some cell types. This activity is directly controlled by certain brain areas, particularly those located in the hypothalamus. A feedback loop signals metabolic changes at the periphery to these brain areas. This review focuses on the role of the autonomic nervous system in the activity and plasticity of pancreas and adipose tissues under normal conditions or in obesity, with special attention to the importance of alterations in these functions.
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Affiliation(s)
- L Pénicaud
- Laboratoire de Neurobiologie, Plasticité Tissulaire et Métabolisme Energétique, CNRS URA 1937, Université Paul Sabatier, CHU Rangueil, Toulouse, France
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Atef N, Ktorza A, Pénicaud L. CNS involvement in the glucose induced increase of islet blood flow in obese Zucker rats. Int J Obes Relat Metab Disord 1995; 19:103-7. [PMID: 7735335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
OBJECTIVES The aim of this work was to study the role of the central nervous system in the glucose-induced increase in islet blood flow in obese Zucker rats. DESIGN A small amount of glucose (9 mg/kg) was injected towards the brain via the left carotid artery in lean obese rats either intact or vagotomized and after a pretreatment with clonidine. RESULTS Glucose injection induced a significant increase in plasma insulin level and islet blood flow without a significant change in plasma glucose concentration in both lean and obese rats. Prior vagotomy or clonidine injection resulted in a decrease in glucose-induced islet blood flow. Both the effect of glucose and its reversal were more pronounced in obese rats. CONCLUSION In obese rats, an alteration of the CNS could result in an increase in the parasympathetic tone and a decrease in the sympathetic one. These alterations would in turn contribute to the modifications in islet blood flow.
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Affiliation(s)
- N Atef
- Laboratoire de Physiopathologie de la Nutrition, CNRS URA 307, Université Paris VII, France
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Abstract
Islet blood flow was quantified in NIDDM rats either of the GK strain on after neonatal injection of STZ (n0-STZ), using the non-radioactive microsphere technique. In the basal state, there was a good correlation between plasma insulin level and islet blood flow, i.e. both were increased or decreased in comparison to those of control rats in GK and n0-STZ rats, respectively. The increased islet blood flow and plasma insulin levels observed in the GK rats were abolished by bilateral subdiaphragmatic vagotomy. During a glucose challenge, whereas plasma insulin and islet blood flow were doubled in control rats, these parameters were not modified in the diabetic rats. These data demonstrate an alteration in the islet blood flow of diabetic rats during a glucose challenge which could participate in the abnormal glucose-induced insulin secretion previously described in these two models.
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Affiliation(s)
- N Atef
- Laboratoire de Physiopathologie de la Nutrition, CNRS URA 307, Université Paris VII, France
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Koranyi L, Tanizawa Y, Penicaud L, Atef N, Girard J, Permutt MA. Developmental regulation of amylin and insulin-gene expression in lean (Fa/Fa) and obese (fa/fa) Zucker rats. Diabetes 1992; 41:685-90. [PMID: 1375176 DOI: 10.2337/diab.41.6.685] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Obese individuals are hyperinsulinemic and insulin resistant. Because amylin is cosecreted with insulin and may contribute to the insulin resistance of obesity, this study tested the hypothesis that insulin and amylin genes are coordinately regulated by obesity and carbohydrate feeding. Insulin and amylin gene expression were measured during the suckling/weaning transition in lean (Fa/Fa) and obese (fa/fa) Zucker rats, a period associated with marked changes in tissue insulin sensitivity. There was a decline in insulin mRNA (-90 +/- 15%, P less than 0.01) and amylin mRNA (-72 +/- 21%, P less than 0.01) content in pancreases of lean rats maintained on a high-fat diet from days 15 to 30, probably reflecting the relative increase in exocrine/endocrine development during this neonatal period and the effects of fat feeding. Weaning on high-carbohydrate versus high-fat diets resulted in enhanced expression of both insulin (P less than 0.05) and amylin (P less than 0.05) mRNAs. In contrast to the decline in pancreatic insulin and amylin mRNA content observed in lean rats, there was an increase in insulin mRNA (421.3 +/- 57.5%, P less than 0.05) and no change in amylin mRNA in obese rats maintained on a high-fat diet from days 15 to 30. There was no enhancement of insulin or amylin gene expression in obese rats with high carbohydrate relative to high-fat feeding, perhaps reflecting maximum rates of transcription in these obese insulin-resistant rats.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- L Koranyi
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri 63110
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Abstract
Hyperinsulinemia, a main feature of both human and animal obesity, has been demonstrated to be due to both an increased sensitivity to nutrient secretagogues and an impairment of the nervous regulation of insulin secretion. Recent studies have shown that pancreatic islet blood flow increases under conditions associated with an enhanced insulin secretion. The aim of this study was to determine whether or not changes in islet blood flow are present in hyperinsulinemic obese rats. Using the nonradioactive microsphere technique, we were able to show a significantly higher islet blood flow in obese rats either of the Zucker strain or Wistar rats after lesion of the ventromedial hypothalamus than in their respective lean controls. Subdiaphragmatic vagotomy had no significant effect on basal islet blood flow of lean rats, whereas it decreased significantly that of obese Zucker rats. Conversely, clonidine, an alpha 2-adrenergic agonist, induced a higher decrease of islet blood flow in obese than in lean Zucker rats. The injection of an intravenous bolus of glucose (375 mg/kg iv) increased significantly more islet blood flow in obese than in lean Zucker rats. It is concluded that obese rats present an increased pancreatic islet blood flow, which may result, at least in part, from exaggerated parasympathetic activity and lower than normal sympathetic activity. This could participate in the hyperinsulinemia observed in these rats.
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Affiliation(s)
- N Atef
- Laboratoire de Physiopathologie de la Nutrition, Centre National de la Recherche Scientifique, Unité de Recherche Associée 307, Université Paris VII, France
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Atef N, Brulé C, Bihoreau MT, Ktorza A, Picon L, Pénicaud L. Enhanced insulin secretory response to acetylcholine by perifused pancreas of 5-day-old preobese Zucker rats. Endocrinology 1991; 129:2219-24. [PMID: 1915103 DOI: 10.1210/endo-129-4-2219] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The insulin secretion rate in response to different secretagogues and neurotransmittors was studied in perifused pancreas of 5-day-old lean (Fa/Fa) and preobese (fa/fa) Zucker rats. Glucose (16.6 mM) alone or in combination with 20 mM arginine or 5 mM theophylline induced a net stimulation of insulin secretion. This effect was similar in the two groups. By contrast, the stimulatory effect of acetylcholine on glucose-induced insulin secretion was significantly higher in preobese pups than in lean rats. There was also a tendency toward a higher inhibitory effect of norepinephrine on insulin secretion in preobese than in lean rats, but this difference did not reach statistical significance. Together these results demonstrate a normal insulin secretion in response to nutrient secretagogues in preobese fa/fa rats but an enhanced effect of acetylcholine. This latter effect may be related to the changes in the autonomic nervous system activity, which is usually described in obese fa/fa rats.
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Affiliation(s)
- N Atef
- Laboratoire de Physiopathologie de la Nutrition, CNRS URA 307, Université Paris VII, France
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