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Saltarelli R, Palma F, Gioacchini AM, Calcabrini C, Mancini U, De Bellis R, Stocchi V, Potenza L. Phytochemical composition, antioxidant and antiproliferative activities and effects on nuclear DNA of ethanolic extract from an Italian mycelial isolate of Ganoderma lucidum. J Ethnopharmacol 2019; 231:464-473. [PMID: 30513345 DOI: 10.1016/j.jep.2018.11.041] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 11/27/2018] [Accepted: 11/29/2018] [Indexed: 06/09/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Ganoderma lucidum (Curtis) P. Karst. (also known as Linghzhi and Reishi) is the most appreciated and revered medicinal mushroom across many Asian countries, but its properties have also attracted interest in Western countries. Indeed, in the West, it is now commercially available as a dietary supplement in preparations mainly made from spores, fruiting bodies and mycelia. It is employed in both nutraceutical and pharmacological formulations either for its immuno-modulating anti-inflammatory properties or as an effective adjuvant therapy in the treatment of several chronic diseases as well as in cancer treatment. AIM OF THE STUDY The aim of this investigation was to show the phytochemical composition and antioxidant and antiproliferative activities of an ethanolic extract from an Italian mycelial isolate of Ganoderma lucidum and to assess its effects on nuclear DNA. MATERIALS AND METHODS LC/ESI-MS and tandem mass spectrometry MSMS were used to obtain structural identification of ethanolic G. lucidum extract constituents. Antioxidant activities were determined by the DPPH method, chelating effect on Fe2+ and lipoxygenase inhibition while cytotoxic activities using the MTT assay. Effects on nuclear DNA were evaluated using the DNA nicking assay in a cell-free system and the fast halo assay performed on oxidatively injured human U937 cells; apoptosis induction was investigated using the non-denaturing fast halo assay and DNA laddering detection. RESULTS This extract was rich in several bioactive compounds, mainly phenolic and triterpenic acids. It showed antioxidant activity and protective effects in oxidatively injured DNA in cell-free analyses and antiproliferative, genotoxic, and proapoptotic effects in the cell model. CONCLUSIONS Italian G. lucidum mycelium isolate appears to be a source of various natural compounds that may have applications as chemopreventive agents or functional foods.
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Affiliation(s)
- Roberta Saltarelli
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, 61029 Urbino, PU, Italy.
| | - Francesco Palma
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, 61029 Urbino, PU, Italy.
| | - Anna Maria Gioacchini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, 61029 Urbino, PU, Italy.
| | - Cinzia Calcabrini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, 61029 Urbino, PU, Italy; Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Corso d'Augusto 237, 47921 Rimini, RN, Italy.
| | - Umberto Mancini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, 61029 Urbino, PU, Italy.
| | - Roberta De Bellis
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, 61029 Urbino, PU, Italy.
| | - Vilberto Stocchi
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, 61029 Urbino, PU, Italy.
| | - Lucia Potenza
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, 61029 Urbino, PU, Italy.
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Calcabrini C, Mancini U, De Bellis R, Frati A, Mastrogiacomo AR, Annibalini G, Sestili P, Cucchiarini L, Stocchi V, Potenza L. Protective Role of Italian Juglans regia L. nut Ethanolic Extract in Human Keratinocytes under Oxidative and Inflammatory Stress. Curr Pharm Biotechnol 2018; 18:925-934. [PMID: 29332575 DOI: 10.2174/1389201019666180112145717] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 09/25/2017] [Revised: 12/15/2017] [Accepted: 01/11/2018] [Indexed: 11/22/2022]
Abstract
OBJECTIVE In this research, fatty acid profile and polyphenolic content of an ethanolic extract of walnut from Juglans regia L. collected in Central Italy, were characterized. The potential antioxidant and anti-inflammatory effects of the extract were investigated in the human keratinocytes cell line. METHODS Fatty acid profile was determined by gas chromatography/mass spectrometry analysis, total phenolic content by Folin-Ciocalteu method and aluminum chloride colorimetric method was used for determination of total flavonoids. Kertatinocytes were exposed to t-butyl hydroperoxide or Tumor Necrosis Factor alfa in the absence or presence of extract. Reduced glutathione was determined by Sedlak method; lipid peroxidation was assessed by measuring thiobarbituric acid reactive substances. t-butyl hydroperoxide and Tumor Necrosis Factor alfa-induced intracellular reactive oxygen species were monitored by fluorescent probes. The expression of some genes related to the inflammatory process (IL-6, IL-8, ikB, and ICAM) were analysed by Real-time PCR. RESULTS JRE contains a favourable fatty acid profile with low saturated fats (19%) and high-unsaturated fats (81%) with a prevalence of the omega-6 linoleic acid (48%). Also a significant amount of polyphenols was found (5,0052 mg gallic acid equivalent/gdw). Antioxidant and anti-inflammatory properties of JRE were observed on analysed cellular model. JRE antioxidants counteracted ROS production, GSH depletion and lipid peroxidation as well downregulated the expression of some genes related to the inflammatory process. Moreover, polyunsaturated fatty acids exhibited anti-inflammatory properties. CONCLUSION The obtained results uphold walnut as dietary adjunct in health promotion and drive towards its development in drug therapy against chronic inflammatory disorders, including inflammatory skin diseases.
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Affiliation(s)
- Cinzia Calcabrini
- Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Corso d'Augusto 237, (RN), I
47921, Italy
| | - Umberto Mancini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, Urbino (PU) I-61029, Italy
| | - Roberta De Bellis
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, Urbino (PU) I-61029, Italy
| | - Alessandra Frati
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, Urbino (PU) I-61029, Italy
| | - Anna Rita Mastrogiacomo
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, Urbino (PU) I-61029, Italy
| | - Giosue Annibalini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, Urbino (PU) I-61029, Italy
| | - Piero Sestili
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, Urbino (PU) I-61029, Italy
| | - Luigi Cucchiarini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, Urbino (PU) I-61029, Italy
| | - Vilberto Stocchi
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, Urbino (PU) I-61029, Italy
| | - Lucia Potenza
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi, 2, Urbino (PU) I-61029, Italy
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Calcabrini C, De Bellis R, Mancini U, Cucchiarini L, Stocchi V, Potenza L. Protective Effect of Juglans regia L. Walnut Extract Against Oxidative DNA Damage. Plant Foods Hum Nutr 2017; 72:192-197. [PMID: 28401378 DOI: 10.1007/s11130-017-0609-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Walnuts (Juglans regia L.) are relevant components of the Mediterranean diet providing important macronutrients, micronutrients and other bioactive constituents including unsaturated fatty acids, proteins, fiber, vitamins, minerals, phytosterols and polyphenols. Although the walnut beneficial effects in human health are widely recognized by a lot of epidemiologic studies very little is known regarding its effect on damaged DNA. The aim of the present study was to investigate the effect of Juglans regia L. ethanolic extract from kernel on the induction of DNA strand breaks by thiol/Fe3+/O2 mixed function oxidase, tert-butyl hydroperoxide or UVC radiations in acellular and cellular models. Plasmid DNA cleavage and fast Halo assay were used to monitor oxidative damage to DNA. Both approaches showed protection of oxidatively injured DNA. These results agree with a lot of scientific proofs which recommend walnut as dietary adjunct in health promotion and prevention as well as in treatment of lifestyle-related oxidative diseases.
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Affiliation(s)
- Cinzia Calcabrini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi 2, I-61029, Urbino, PU, Italy
- Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Corso d'Augusto 237, I 47921, Rimini, RN, Italy
| | - Roberta De Bellis
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi 2, I-61029, Urbino, PU, Italy
| | - Umberto Mancini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi 2, I-61029, Urbino, PU, Italy
| | - Luigi Cucchiarini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi 2, I-61029, Urbino, PU, Italy
| | - Vilberto Stocchi
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi 2, I-61029, Urbino, PU, Italy
| | - Lucia Potenza
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi 2, I-61029, Urbino, PU, Italy.
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Calcabrini C, Mancini U, De Bellis R, Diaz AR, Martinelli M, Cucchiarini L, Sestili P, Stocchi V, Potenza L. Effect of extremely low-frequency electromagnetic fields on antioxidant activity in the human keratinocyte cell line NCTC 2544. Biotechnol Appl Biochem 2016; 64:415-422. [PMID: 27001710 DOI: 10.1002/bab.1495] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [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: 08/01/2015] [Accepted: 03/15/2016] [Indexed: 11/09/2022]
Abstract
Some epidemiological studies have suggested possible associations between exposure to extremely low-frequency electromagnetic fields (ELF-EMFs) and various diseases. Recently, ELF-EMF has been considered as a therapeutic agent. To support ELF-EMF use in regenerative medicine, in particular in the treatment of skin injuries, we investigated whether significant cell damage occurs after ELF-EMF exposure. Reactive oxygen species (ROS) production was evaluated in the human keratinocyte exposed for 1 H to 50 Hz ELF-EMF in a range of field strengths from 0.25 to 2 G. Significant ROS increases resulted at 0.5 and 1 G and under these flux densities ROS production, glutathione content, antioxidant defense activity, and lipid peroxidation markers were assessed for different lengths of time. Analyzed parameters of antioxidant defense and membrane integrity showed a different trend at two selected magnetic fluxes, with a greater sensitivity of the cells exposed to 0.5 G, especially after 1 H. All significant alterations observed in the first 4 H of exposure reverted to controls 24 H after suggesting that under these conditions, ELF-EMF induces a slight oxidative stress that does not overwhelm the metabolic capacity of the cells or have a cytotoxic effect.
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Affiliation(s)
- Cinzia Calcabrini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Umberto Mancini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Roberta De Bellis
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Anna Rita Diaz
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Maddalena Martinelli
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Luigi Cucchiarini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Piero Sestili
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Vilberto Stocchi
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Lucia Potenza
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
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Potenza L, Calcabrini C, Bellis RD, Mancini U, Polidori E, Zeppa S, Alloni R, Cucchiarini L, Dacha M. Effect of surgical stress on nuclear and mitochondrial DNA from healthy sections of colon and rectum of patients with colorectal cancer. J Biosci 2011; 36:243-51. [PMID: 21654079 DOI: 10.1007/s12038-011-9064-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [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: 01/17/2023]
Abstract
Surgical resection at any location in the body leads to stress response with cellular and subcellular change, leading to tissue damage. The intestine is extremely sensitive to surgical stress with consequent postoperative complications. It has been suggested that the increase of reactive oxygen species as subcellular changes plays an important role in this process. This article focuses on the effect of surgical stress on nuclear and mitochondrial DNA from healthy sections of colon and rectum of patients with colorectal cancer. Mitochondrial DNA copy number, mitochondrial common deletion and nuclear and mitochondrial 8-oxo-2'-deoxyguanosine content were measured. Both the colon and rectal tissue were significantly damaged either at the nuclear or mitochondrial level. In particular, mitochondrial DNA was more damaged in rectum than in colon. The present investigation found an association between surgical stress and nuclear and mitochondrial DNA damage, suggesting that surgery may generate an increase in free radicals, which trigger a cascade of molecular changes, including alterations in DNA.
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Affiliation(s)
- Lucia Potenza
- Dipartimento di Scienze Biomolecolari, Universita degli Studi di Urbino 'Carlo Bo', Urbino, Italy.
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Fraternale D, De Bellis R, Calcabrini C, Potenza L, Cucchiarini L, Mancini U, Dachà M, Ricci D. Aqueous extract from Vitis vinifera tendrils is able to enrich keratinocyte antioxidant defences. Nat Prod Commun 2011; 6:1315-1319. [PMID: 21941905] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
An aqueous extract of V. vinifera L. tendrils was evaluated for its ability to enrich the antioxidant capacity of cultured cells. The long-time antioxidant capability of the extract was measured by in vitro chemical methods, and its influence on reduced glutathione levels and plasma membrane oxido reductase activity was determined in cultured human keratinocytes (NCTC 2544). Keratinocytes are cells normally exposed to oxidative stress, and for this reason adequately equipped with antioxidant defences. However, it has long been suggested that exogenous antioxidants may play an important role in minimizing the adverse effects of oxidative stress on skin.We demonstrated that V. vinifera tendril aqueous extract was able to increase, in a time- and dose-dependent manner, the reduced glutathione concentration and activity of trans plasma membrane oxido reductase as an indirect evaluation of the intracellular redox status of the cells demonstrating a relevant antioxidant activity of this phytocomplex.
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Affiliation(s)
- Daniele Fraternale
- Dipartimento di Scienze della Terra, della Vitae dell'Ambiente, Università degli Studi di Urbino "Carlo Bo", Urbino, Italy
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7
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Fraternale D, De Bellis R, Calcabrini C, Potenza L, Cucchiarini L, Mancini U, Dachà M, Ricci D. Aqueous Extract from Vitis vinifera Tendrils is Able to Enrich Keratinocyte Antioxidant Defences. Nat Prod Commun 2011. [DOI: 10.1177/1934578x1100600925] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
An aqueous extract of V. vinifera L. tendrils was evaluated for its ability to enrich the antioxidant capacity of cultured cells. The long-time antioxidant capability of the extract was measured by in vitro chemical methods, and its influence on reduced glutathione levels and plasma membrane oxido reductase activity was determined in cultured human keratinocytes (NCTC 2544). Keratinocytes are cells normally exposed to oxidative stress, and for this reason adequately equipped with antioxidant defences. However, it has long been suggested that exogenous antioxidants may play an important role in minimizing the adverse effects of oxidative stress on skin. We demonstrated that V. vinifera tendril aqueous extract was able to increase, in a time- and dose-dependent manner, the reduced glutathione concentration and activity of trans plasma membrane oxido reductase as an indirect evaluation of the intracellular redox status of the cells demonstrating a relevant antioxidant activity of this phytocomplex.
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Affiliation(s)
- Daniele Fraternale
- Dipartimento di Scienze della Terra, della Vita e dell'Ambiente, Università degli Studi di Urbino “Carlo Bo “, Urbino, Italy
| | - Roberta De Bellis
- Dipartimento di Scienze Biomolecolari, Università degli Studi di Urbino “Carlo Bo “, Urbino, Italy
| | | | - Lucia Potenza
- Dipartimento di Scienze Biomolecolari, Università degli Studi di Urbino “Carlo Bo “, Urbino, Italy
| | - Luigi Cucchiarini
- Dipartimento di Scienze Biomolecolari, Università degli Studi di Urbino “Carlo Bo “, Urbino, Italy
| | - Umberto Mancini
- Dipartimento di Scienze Biomolecolari, Università degli Studi di Urbino “Carlo Bo “, Urbino, Italy
| | - Marina Dachà
- Centro Integrato di Ricerche, Università Campus Bio-Medico, Rome, Italy
| | - Donata Ricci
- Dipartimento di Scienze della Terra, della Vita e dell'Ambiente, Università degli Studi di Urbino “Carlo Bo “, Urbino, Italy
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Abstract
Quercetin is a well-investigated antioxidant known to protect cells against oxidative nuclear DNA damage. There is no knowledge regarding its effect on oxidative mitochondrial DNA damage. In this study we investigated the effect of quercetin on oxidatively-injured DNA. Cell-free and cell studies were performed. Cell-free analyses carried out on plasmidic DNA showed that quercetin protects from all oxidative challenges used. Cellular studies were carried out on NCTC 2544 cells which were insulted with hydrogen peroxide and UVC radiations. Nuclear and mitochondrial DNAs were analysed by measuring DNA damage with a quantitative polymerase chain reaction. Quercetin supplementation showed significant genoprotective activity on mitochondrial DNA when hydroperoxide was used. The evidence of the protection afforded by quercetin suggests that this flavonoid may play an important role on mitochondrial genome stability.
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Affiliation(s)
- Lucia Potenza
- Dipartimento di Scienze Biomolecolari, Università degli Studi di Urbino "Carlo Bo", Urbino, Italy.
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De Sanctis R, De Bellis R, Scesa C, Mancini U, Cucchiarini L, Dachà M. In vitro protective effect of Rhodiola rosea extract against hypochlorous acid-induced oxidative damage in human erythrocytes. Biofactors 2004; 20:147-59. [PMID: 15665385 DOI: 10.1002/biof.5520200304] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [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: 11/08/2022]
Abstract
Rhodiola rosea L. (Crassulaceae) is a plant living at high altitudes in Europe and Asia. Its roots have long been used in the traditional medical system of these geographical areas to increase the organism resistance to physical stress; today, it has become an important component of many dietary supplements. In this study we investigate the antioxidant capacity of the R. rosea aqueous extract evaluating its ability to counteract some of the main damages induced by hypochlorous acid (HOCl), a powerful oxidant generated by activated phagocytes, to human erythrocytes. Ascorbic acid was used as a reference substance because of its physiological HOCl-scavenging ability. Our study demonstrates that R. rosea is able to significantly protect, in a dose-dependent manner, human RBC from glutathione (GSH) depletion, glyceraldehyde-3-phosphate dehydrogenase (GAPDH) inactivation and hemolysis induced by the oxidant. Furthermore, we demonstrate that R. rosea aqueous extract acts from the inside of the erythrocyte suggesting a probable involving of cell components. The protection on GSH afforded by the R. rosea extract with respect to ascorbic acid, occurred also if added 2 or 5 min. later than the oxidant, suggesting a more rapid or powerful effect.
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Affiliation(s)
- Roberta De Sanctis
- Istituto di Chimica Biologica "Giorgio Fornaini", Università degli Studi di Urbino "Carlo Bo", Urbino (PU), Italy
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Chiarantini L, Matteucci D, Pistello M, Mancini U, Mazzetti P, Massi C, Giannecchini S, Lonetti I, Magnani M, Bendinelli M. AIDS vaccination studies using an ex vivo feline immunodeficiency virus model: homologous erythrocytes as a delivery system for preferential immunization with putative protective antigens. Clin Diagn Lab Immunol 1998; 5:235-41. [PMID: 9521149 PMCID: PMC121364 DOI: 10.1128/cdli.5.2.235-241.1998] [Citation(s) in RCA: 14] [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] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Feline immunodeficiency virus (FIV) is a useful model for testing of criteria for AIDS vaccine development. In the protocol we adopted, we used a primary isolate of FIV as a source of antigen and, for challenge, plasma from cats infected with the homologous virus never passaged in vitro. Cat erythrocytes (RBC) were coated with the surface components of freshly harvested and purified FIV by means of biotin-avidin-biotin bridges and used to immunize specific-pathogen-free cats (four doses at monthly intervals; total amount of FIV antigen administered per cat, approximately 14 microg). Immunized cats developed moderate levels of antibodies directed mainly to surface components of the virion and clearly evident lymphoproliferative responses. Four months after the last dose of immunogen, FIV-immunized cats and control cats immunized with bovine serum albumin-coated RBC were challenged. Judged from the results of the subsequent 12-month follow-up, FIV-immunized cats exhibited at least some degree of protection. However, following rechallenge, most of the FIV-immunized animals became virus positive in spite of a booster immunogen dose given 2 months before the second challenge.
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Affiliation(s)
- L Chiarantini
- Department of Biomedicine, University of Pisa, Italy
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11
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Abstract
Biotinylation of intact mammalian red blood cells (RBC) was performed either by attachment to the amino groups by means of biotin N-hydrosuccinimide ester (NHS-biotin) or by oxidation of the induced aldehyde groups of the RBC membrane by biotin hydrazide. Comparison of these different procedures showed that biotinylation by NHS-biotin provided the highest cell recovery (> 90%), the binding of approximately 1000 biotin molecules/cell (on mouse RBC) and the 24 h survival in circulation was unaffected. In contrast, biotin hydrazide produced cell recovery in the 5-30% range (depending on the extent of oxidation), an undetectable number of molecules of biotin/cell and negligible 24 h survival. Among the NHS derivatives of biotin, further studies were performed on those containing a spacer arm of 2.2 nm (22 A) [sulphosuccinimidyl-6-(biotinamido)-hexanoate]. In vitro this derivative was similar to, or better than, the NHS-biotin in terms of cell recovery and the number of molecules/cell. In vivo this derivative showed a 24 h circulation survival similar to that of NHS-biotin. Unfortunately, biotin bound with such a spacer arm is lost after a few days of RBC circulation, probably due to plasma biotinidase. Possible applications of biotinylated RBCs include the in vivo measurement of RBC volume, the RBC survival and the delivery of enzyme and antigens.
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Affiliation(s)
- M Magnani
- Istituto di Chimica Biologica Giorgio Fornaini, Universita degli Studi di Urbino, Italy
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Magnani M, Fazi A, Mangani F, Rossi L, Mancini U. Methanol detoxification by enzyme-loaded erythrocytes. Biotechnol Appl Biochem 1993; 18:217-26. [PMID: 8297502] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Alcohol oxidase (AlOx) from Pichea pastoris (a methylotrophic yeast) was encapsulated into human and murine erythrocytes up to 2 units/ml of packed cells. This enzyme has a much higher affinity for methanol than for ethanol, thus making the loaded erythrocytes useful cellular bioreactors able to catabolize methanol. Enzyme-loaded erythrocytes showed an increased rate of the hexose-monophosphate-shunt activity and a significant methaemoglobin production. However, the in vivo survival of these cells does not seem to be significantly affected by methanol catabolism. In vivo, mice receiving AlOx-loaded erythrocytes were able to keep the blood methanol concentrations below values that were about 50% of those found in mice receiving unloaded cells and similar amounts of methanol. Thus AlOx-loaded erythrocytes may add an important contribution to the detoxification protocol against methanol poisoning.
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Affiliation(s)
- M Magnani
- Istituto di Chimica Biologica G. Fornaini, Università degli Studi, Urbino (PS), Italy
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Magnani M, Chiarantini L, Vittoria E, Mancini U, Rossi L, Fazi A. Red blood cells as an antigen-delivery system. Biotechnol Appl Biochem 1992; 16:188-94. [PMID: 1457052] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The use of adjuvants is usually required to induce strong immunological responses to protein antigens. However, in many cases these adjuvants cannot be extensively applied in human and veterinary vaccinations because of associated inflammatory reactions or granuloma formation. We show here that protein antigens (bovine serum albumin, hog liver uricase, and yeast hexokinase), coupled to autologous red blood cells by way of a biotin-avidin-biotin bridge, elicit an immunological response in mice similar to or higher than that obtained by the use of Freund's adjuvant. Quantities as low as 0.5 micrograms/mouse are high enough to generate these immunological responses. Furthermore, splenocytes of mice immunized by red blood cell-coupled antigens can be used to generate hybridomas secreting monoclonal antibodies. Thus, the delivery of antigens by autologous red blood cells is an effective way to avoid the use of adjuvants for producing anti-peptide antibodies and possibly to generate peptide vaccines.
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Affiliation(s)
- M Magnani
- Istituto di Chimica Biologica Giorgio Fornaini, Università degli Studi, Urbino, Italy
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14
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Magnani M, Mancini U, Bianchi M, Fazi A. Comparison of uricase-bound and uricase-loaded erythrocytes as bioreactors for uric acid degradation. Adv Exp Med Biol 1992; 326:189-94. [PMID: 1295305 DOI: 10.1007/978-1-4615-3030-5_23] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- M Magnani
- Istituto di Chimica Biologica Giorgio Fornaini, Università di Urbino, Italy
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Fazi A, Mancini U, Piatti E, Accorsi A, Magnani M. Xenobiotic detoxification by GSH-loaded erythrocytes. Adv Exp Med Biol 1992; 326:195-201. [PMID: 1295307 DOI: 10.1007/978-1-4615-3030-5_24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- A Fazi
- Istituto di Chimica Biologica Giorgio Fornaini, Università di Urbino, Italy
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Fazi A, Mancini U, Piatti E, Accorsi A, Magnani M. Human red blood cells as bioreactors for the inactivation of harmful xenobiotics. Biotechnol Appl Biochem 1991; 14:60-8. [PMID: 1910585] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Human red blood cells are able to inactivate lipophilic electrophiles by conjugation with reduced glutathione. This metabolic ability was found to be limited by the rate of permeation of the xenobiotic into erythrocytes and by the amount of available reduced glutathione. By a procedure of hypotonic dialysis, isotonic resealing and reannealing human red blood cells were overloaded with increasing amounts of reduced glutathione up to three- to fourfold the normal level without modification of their metabolic functions or of their energetic state. These overloaded erythrocytes were able to conjugate increasing amounts of xenobiotics and to export the resulting conjugates from the cells. These properties of glutathione overloaded erythrocytes are significant for the use of carrier erythrocytes in cases of acute intoxication by lipophilic electrophiles.
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Affiliation(s)
- A Fazi
- Institute of Biological Chemistry, Giorgio Fornaini, Urbino (PS), Italy
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