RESUMEN

Despite rapid advances in both the early detection and treatment of cancer, the mortality from this disease remains high, which justifies the development of new products that are more selective and effective and have fewer side effects. Accordingly, a novel ester was synthesized that contains two pharmacophores with important biological activities: (I) 4-aminoantipyrine, which has anti-inflammatory and antioxidant effects, and (II) the pharmacophore 1,4-dioxo-butenyl, which has cytotoxic activity. When administered alone, this compound is non-genotoxic, and it does not cause an increasing in splenic phagocytosis. Nevertheless, it can induce cell death. When administered in combination with commercial chemotherapeutic agents, such as doxorubicin, cisplatin, and cyclophosphamide, the ester shows antigenotoxic activity and decreases phagocytosis and reduces the potential to cause cell death. These results indicate that the compound should not be used in combination with chemotherapeutic agents that exert their effect through DNA damage, an important feature of antitumor drugs.

RESUMEN

Calcitriol, the bioactive hormone of vitamin D, is currently linked to several diseases, such as obesity and gain of adipose mass, due to its liposolubility and, consequently, its sequestration by adipocytes. As rates of obesity continue to increase, research on the biology of weight gain should be encouraged. This study evaluated the effects of calcitriol combined with CaCl2 on adipose tissue-derived human mesenchymal stem cells. We evaluated the cytotoxicity of the combination by MTT assays, in which undifferentiated cells and cells undergoing adipogenic differentiation were tested for 7 and 14 days. The results demonstrated that the combination of calcitriol at the IC50 and CaCl2 at the IC20 was effective at reducing the viability of mesenchymal stem cells, but with the progression of cell differentiation towards adipocytes, cell resistance to the cytotoxic effects increased. The percentages of dead cells were 88.29, 57.45 and 28.81% for undifferentiated cells and cells exposed to differentiation medium for 7 and 14 days, respectively. Undifferentiated cells were evaluated for apoptosis in response to the same combination using Annexin V assays, and a possible onset of programmed cell death in undifferentiated cells was detected. Additionally, the combination of the compounds altered the membrane permeability of undifferentiated cells by 16 percentage points and induced cell cycle arrest in S phase due to the accumulation of damage. An evaluation of gene expression revealed the overexpression of the GADD45 and ATM genes and the underexpression of the P21, P53, ATR, BCL-2, EIF2 AK3, IGF1R, DNAse-2, ATF, MAP3K4, ENGO-G, CASP3, CASP7 and CASP8 genes. Our results provide valuable insights into the biology of obesity and may contribute to the development of new anti-obesity therapies focusing on the inhibition of adipose tissue mesenchymal stem cell hyperplasia and adipogenic differentiation.

Asunto(s)

Adipogénesis/efectos de los fármacos , Tejido Adiposo/efectos de los fármacos , Apoptosis/efectos de los fármacos , Calcitriol/farmacología , Cloruro de Calcio/farmacología , Diferenciación Celular/efectos de los fármacos , Células Madre Mesenquimatosas/efectos de los fármacos , Puntos de Control del Ciclo Celular/efectos de los fármacos , Células Cultivadas , Expresión Génica/efectos de los fármacos , Humanos , Obesidad/genética , Fase S/efectos de los fármacos , Aumento de Peso/efectos de los fármacos

RESUMEN

Abstract The increased incidence of cancer and its high treatment costs have encouraged the search for new compounds to be used in adjuvant therapies for this disease. This study discloses the synthesis of (Z)-4-((1,5-dimethyl-3-oxo-2-phenyl-2,3dihydro-1H-pyrazol-4-yl) amino)-4-oxobut-2-enoic acid (IR-01) and evaluates not only the action of this compound on genetic integrity, increase in splenic phagocytosis and induction of cell death but also its effects in combination with the commercial chemotherapeutic agents doxorubicin, cisplatin and cyclophosphamide. IR-01 was designed and synthesized based on two multifunctionalyzed structural fragments: 4-aminoantipyrine, an active dipyrone metabolite, described as an antioxidant and anti-inflammatory agent; and the pharmacophore fragment 1,4-dioxo-2-butenyl, a cytotoxic agent. The results indicated that IR-01 is an effective chemoprotector because it can prevent clastogenic and/or aneugenic damage, has good potential to prevent genomic damage, can increase splenic phagocytosis and lymphocyte frequency and induces cell death. However, its use as an adjuvant in combination with chemotherapy is discouraged since IR-01 interferes in the effectiveness of the tested chemotherapeutic agents. This is a pioneer study as it demonstrates the chemopreventive effects of IR-01, which may be associated with the higher antioxidant activity of the precursor structure of 4-aminoantipyrine over the effects of the 1,4-dioxo-2-butenyl fragment.

RESUMEN

The increased incidence of cancer and its high treatment costs have encouraged the search for new compounds to be used in adjuvant therapies for this disease. This study discloses the synthesis of (Z)-4-((1,5-dimethyl-3-oxo-2-phenyl-2,3dihydro-1H-pyrazol-4-yl) amino)-4-oxobut-2-enoic acid (IR-01) and evaluates not only the action of this compound on genetic integrity, increase in splenic phagocytosis and induction of cell death but also its effects in combination with the commercial chemotherapeutic agents doxorubicin, cisplatin and cyclophosphamide. IR-01 was designed and synthesized based on two multifunctionalyzed structural fragments: 4-aminoantipyrine, an active dipyrone metabolite, described as an antioxidant and anti-inflammatory agent; and the pharmacophore fragment 1,4-dioxo-2-butenyl, a cytotoxic agent. The results indicated that IR-01 is an effective chemoprotector because it can prevent clastogenic and/or aneugenic damage, has good potential to prevent genomic damage, can increase splenic phagocytosis and lymphocyte frequency and induces cell death. However, its use as an adjuvant in combination with chemotherapy is discouraged since IR-01 interferes in the effectiveness of the tested chemotherapeutic agents. This is a pioneer study as it demonstrates the chemopreventive effects of IR-01, which may be associated with the higher antioxidant activity of the precursor structure of 4-aminoantipyrine over the effects of the 1,4-dioxo-2-butenyl fragment.

RESUMEN

The all-trans-retinoic acid (ATRA) is the most active form of vitamin A that helps to regulate the proliferation, differentiation and apoptosis of several types of cells, mainly the adipocytes, and causes weight loss through the reduction of adipogenesis and lipogenesis. In this present study we demonstrated that ATRA concentrations of 20.75, 50 and 100 µM decreased the cell viability in vitro of human adipose-derived stem cells (ADSCs), and in ADSCs during adipogenic differentiation. The cells cycle assessment showed that ATRA increased the cell frequency in Sub-G1 at 4.02x and decreased it in G1 in 2.54x. Moreover, the membrane integrity loss increased by 4.66x and apoptosis increased by 33.56x in ATRA-treated cultures. The gene expression assay suggested that the treatment using ATRA leads to mitochondrial membrane permeabilization and to consequent release of proapoptotic BAK and BAX molecules (increased expression 5.5 and 5.4x respectively); in addition, it increased CASP3 expression (by 8.8x). These events may activate the Bcl-2 (4.1x increase), GADD45 (increase 3.14x) and PPAR-γ (16x increase) expressions, as well as, to reduce the p53 (by -1.38x) expression; therefore, these events should be further mediated by increased RARα expression (by 3.8x). The results evidenced that ATRA may be a good proposal for mesotherapy strategies in order to control the development of subcutaneous adipose tissue; as this tissue have a higher development in some specific areas and ATRA interferes not only in the ADSCs differentiation but also in the apoptosis of ADSCs, preadipocytes and adipocytes.

Asunto(s)

Adipocitos/efectos de los fármacos , Apoptosis/efectos de los fármacos , Diferenciación Celular/efectos de los fármacos , Mitocondrias/efectos de los fármacos , Células Madre/efectos de los fármacos , Tretinoina/farmacología , Adipocitos/metabolismo , Ciclo Celular/efectos de los fármacos , Línea Celular , Supervivencia Celular/efectos de los fármacos , Humanos , Mitocondrias/metabolismo , Transducción de Señal/efectos de los fármacos , Células Madre/metabolismo

RESUMEN

Chemotherapy is one of the major approaches for the treatment of cancer. Therefore, the development of new chemotherapy drugs is an important aspect of medicinal chemistry. Chemotherapeutic agents include isocoumarins, which are privileged structures with potential antitumoral activity. Herein, a new 3-substituted isocoumarin was synthesized from 2-iodo-3,5-dimethoxy-benzoic acid and oct-1-yne in a cross-coupling Sonogashira reaction followed by a copper iodide-catalyzed intramolecular cyclization as key step using MeOH/Et3N as the solvent system. The present study also evaluated the leukometry, phagocytic activity, genotoxic potential and cell death induction of three different doses (5 mg/kg, 10 mg/kg and 20 mg/kg) of this newly synthesized isocoumarin, alone and in combination with the commercial chemotherapeutic agents cyclophosphamide (100 mg/kg) and cisplatin (6 mg/kg) in male Swiss mice. The results suggest that the isocoumarin has genotoxicity and causes cell death. Noteworthy, this new compound can increase splenic phagocytosis and lymphocyte frequency, which are related to immunomodulatory activity. When combined with either cyclophosphamide or cisplatin, chemopreventive activity led to a reduction in the effects of both chemotherapeutic drugs. Thus, the new isocoumarin is not a candidate for chemotherapeutic adjuvant in treatments using cyclophosphamide or cisplatin. Nevertheless, the compound itself is an important prototype for the development of new antitumor drugs.

RESUMEN

Abstract Chemotherapy is one of the major approaches for the treatment of cancer. Therefore, the development of new chemotherapy drugs is an important aspect of medicinal chemistry. Chemotherapeutic agents include isocoumarins, which are privileged structures with potential antitumoral activity. Herein, a new 3-substituted isocoumarin was synthesized from 2-iodo-3,5-dimethoxy-benzoic acid and oct-1-yne in a cross-coupling Sonogashira reaction followed by a copper iodide-catalyzed intramolecular cyclization as key step using MeOH/Et3N as the solvent system. The present study also evaluated the leukometry, phagocytic activity, genotoxic potential and cell death induction of three different doses (5 mg/kg, 10 mg/kg and 20 mg/kg) of this newly synthesized isocoumarin, alone and in combination with the commercial chemotherapeutic agents cyclophosphamide (100 mg/kg) and cisplatin (6 mg/kg) in male Swiss mice. The results suggest that the isocoumarin has genotoxicity and causes cell death. Noteworthy, this new compound can increase splenic phagocytosis and lymphocyte frequency, which are related to immunomodulatory activity. When combined with either cyclophosphamide or cisplatin, chemopreventive activity led to a reduction in the effects of both chemotherapeutic drugs. Thus, the new isocoumarin is not a candidate for chemotherapeutic adjuvant in treatments using cyclophosphamide or cisplatin. Nevertheless, the compound itself is an important prototype for the development of new antitumor drugs.

RESUMEN

Studies have shown that metabolic disorders, serum inflammatory markers and weight gain (obesity) are correlated with vitamin D deficiency. Therefore, the present study correlated the serum calcidiol (s25(OH)D3) levels in a sample of individuals from southern Brazil with variables related to metabolic disorders, obesity and lifestyle habits and assessed the cytotoxic effect of calcitriol on adipose tissue-derived mesenchymal stem cells (ADSCs). The results showed a 79.23% prevalence of hypovitaminosis D in the study population and a correlation (p<0.05) between a low serum vitamin D concentration and an elevated low-density lipoprotein cholesterol (LDL-c) level. Univariate linear regression analysis using 25(OH)D3 as a regressor showed a negative association (p<0.05) with an indoor work environment (ß=-2.305), increased body fat (ß=-0.095), age (ß=-0.065) and high-density lipoprotein cholesterol (HDL-c; ß=-0.109). An in vitro 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay performed with ADSCs using five calcitriol concentrations (15.625, 31.25, 62.5, 125 and 250nM) indicated cytotoxic potential (p<0.05) at the 62.5nM concentration at 48 and 72h and at the 125 and 250nM concentrations at 24, 48 and 72h. The results reported herein corroborate one another and suggest a key association between vitamin D deficiency and the development of obesity because ADSCs are involved in adipose tissue hyperplasia and differentiate into adipocytes that can sequester the bioavailable vitamin D necessary for homeostasis.

Asunto(s)

Tejido Adiposo/citología , Composición Corporal/efectos de los fármacos , Células Madre Mesenquimatosas/citología , Vitamina D/farmacología , Adolescente , Adulto , Brasil , Muerte Celular/efectos de los fármacos , Diferenciación Celular/efectos de los fármacos , Forma de la Célula/efectos de los fármacos , Femenino , Humanos , Concentración 50 Inhibidora , Modelos Lineales , Masculino , Células Madre Mesenquimatosas/efectos de los fármacos , Células Madre Mesenquimatosas/metabolismo , Persona de Mediana Edad , Análisis Multivariante , Adulto Joven

RESUMEN

Acute renal failure (ARF) is an extremely important public health issue in need of novel therapies. The present study aimed to evaluate the capacity of mesenchymal stem cell (MSC) therapy to promote the improvement and recovery of renal function in a preclinical model. Wistar rats were used as the experimental model, and our results show that cisplatin (5mg/kg) can efficiently induce ARF, as measured by changes in biochemical (urea and creatinine) and histological parameters. MSC therapy performed 24h after the administration of chemotherapy resulted in normalized plasma urea and creatinine levels 30 and 45d after the onset of kidney disease. Furthermore, MSC therapy significantly reduced histological changes (intratubular cast formation in protein overload nephropathy and tubular hydropic degeneration) in this ARF model. Thus, considering that current therapies for ARF are merely palliative and that MSC therapy can promote the improvement and recovery of renal function in this model system, we suggest that innovative/alternative therapies involving MSCs should be considered for clinical studies in humans to treat ARF.

RESUMEN

Cardanol is an effective antioxidant and is a compound with antimutagenic and antitumoral activity. Here, we evaluated the genotoxic and mutagenic potential of saturated side chain cardanol and its effects in combination with cyclophosphamide in preventing DNA damage, apoptosis, and immunomodulation. Swiss mice were treated with cardanol (2.5, 5 and 10 mg/kg) alone or in combination with cyclophosphamide (100 mg/kg). The results showed that cardanol is an effective chemopreventive compound, with damage reduction percentages that ranged from 18.9 to 31.76% in the comet assay and from 45 to 97% in the micronucleus assay. Moreover, cardanol has the ability to reduce the frequency of apoptosis induced by cyclophosphamide. The compound did not show immunomodulatory activity. A final interpretation of the data showed that, despite its chemoprotective capacity, cardanol has a tendency to induce DNA damage. Hence, caution is needed if this compound is used as a chemopreventive agent. Also, this compound is likely not suitable as an adjuvant in chemotherapy treatments that use cyclophosphamide.

RESUMEN

Combretastatin A-4 exhibits efficient anti-cancer potential in human tumors, including multidrug-resistant tumors. We evaluated the mutagenic, apoptotic and immunomodulatory potential of two diaryl sulfide analogs of combretastatin A-4, 1,2,3-trimethoxy-5-([4-methoxy-3-nitrophenyl]thio)benzene (analog 1) and 1,2,3-trimethoxy-5-([3-amino-4-methoxyphenyl]thio)benzene (analog 2), as well as their association with the anti-tumor agent cyclophosphamide, in Swiss mice. Such evaluation was achieved using the comet assay, peripheral blood micronucleus test, splenic phagocytosis assay, and apoptosis assay. Both analogs were found to be genotoxic, mutagenic and to induce apoptosis. They also increased splenic phagocytosis, although this increase was more pronounced for analog 2. When combined with cyclophosphamide, analog 1 enhanced the mutagenic and apoptotic effects of this anti-tumor agent. In contrast, analog 2 did not enhance the effects of cyclophosphamide and prevented apoptosis at lower doses. These data suggest that analog 1 could be an adjuvant chemotherapeutic agent and possibly improve the anti-neoplastic effect of cyclophosphamide. Additionally, this compound could be a candidate chemotherapeutic agent and/or an adjuvant for use in combined anti-cancer therapy.

Asunto(s)

Antineoplásicos Fitogénicos/administración & dosificación , ADN/efectos de los fármacos , Sulfuros/administración & dosificación , Animales , Antineoplásicos Fitogénicos/farmacología , Apoptosis , Supervivencia Celular/efectos de los fármacos , Ciclofosfamida/farmacología , Sinergismo Farmacológico , Humanos , Masculino , Ratones , Pruebas de Micronúcleos , Fagocitosis/efectos de los fármacos , Estilbenos/química , Sulfuros/farmacología

RESUMEN

BACKGROUND: A large number of studies are attempting to identify alternative products from natural sources or synthesized compounds that effectively interact with cancer cells without causing adverse effects on healthy cells. Resorcinolic lipids are a class of bioactive compounds that possess anticancer activity and are able to interact with the lipid bilayer. Therefore, the objective of this study was to synthesize a novel resorcinolic lipid and test its biological proprieties. METHODS: We aimed to synthesize a novel resorcinolic lipid belonging to the class of cytosporones, AMS049 (3-Heptyl-4,6-dihydroxy-3H-isobenzofuran-1-one) and to evaluate the toxicity of two concentrations of this lipid (7.5 and 10 mg/kg) by determining its genotoxic, mutagenic, immunomodulatory, and apoptotic effects, as well as any biochemical and histopathological alterations in mice treated with cyclophosphamide. The results were analyzed by ANOVA followed by the Tukey test A . level of significance of p < 0.05 was adopted. RESULTS: The new cytosporone AMS049 was synthesized in only three steps and in satisfactory yields. The results indicate that the compound is neither genotoxic nor mutagenic and does not alter biochemical parameters. The histological alterations observed in the liver and kidneys did not compromise the function of these organs. Histology of the spleen suggested immunomodulation, although no changes were observed in splenic phagocytosis or differential blood cell count. The results also show that AMS049 potentiates the mutagenic effect of the chemotherapy drug cyclophosphamide and that the combination induces apoptosis. CONCLUSION: These facts indicate a potential therapeutic application of this novel cytosporone as an important chemotherapeutic adjuvant.

Asunto(s)

Benzofuranos/administración & dosificación , Benzofuranos/síntesis química , Ciclofosfamida/administración & dosificación , Factores Inmunológicos/administración & dosificación , Factores Inmunológicos/síntesis química , Animales , Apoptosis , Benzofuranos/farmacología , Ciclofosfamida/farmacología , Sinergismo Farmacológico , Factores Inmunológicos/farmacología , Riñón/efectos de los fármacos , Riñón/patología , Hígado/efectos de los fármacos , Hígado/patología , Masculino , Ratones , Bazo/efectos de los fármacos

RESUMEN

ß-glucan is a well-known polysaccharide for its chemopreventive effect. This study aimed to evaluate the chemopreventive ability of ß-glucan in somatic and germ cells through the dominant lethal and micronucleus assays, and its influence on the reproductive performance of male mice exposed to cyclophosphamide. The results indicate that ß-glucan is capable of preventing changes in DNA in both germ cells and somatic ones. Changes in germ cells were evaluated by the dominant lethal assay and showed damage reduction percentages of 46.46% and 43.79% for the doses of 100 and 150 mg/kg. For the somatic changes, evaluated by micronucleus assay in peripheral blood cells in the first week of treatment, damage reduction percentages from 80.63-116.32% were found. In the fifth and sixth weeks, the percentage ranged from 10.20-52.54% and -0.95-62.35%, respectively. Besides the chemopreventive efficiency it appears that the ß-glucan, when combined with cyclophosphamide, is able to improve the reproductive performance of males verified by the significant reduction in rates of post-implantation losses and reabsorption in the mating of nulliparous females with males treated with cyclophosphamide.

RESUMEN

ETHNOPHARMACOLOGICAL RELEVANCE: Gochnatia polymorpha ssp. floccosa is used in folk medicine to treat inflammation and infections. Non-steroidal anti-inflammatory drugs (NSAIDs) are the most commonly consumed medications during pregnancy in women with inflammatory diseases. However, the relationship between the use of NSAIDs and the risk of miscarriage and birth defects and/or benefits is not fully understood. Thus, an investigation regarding the use of Gochnatia polymorpha during gestation is of relevance for developing safe anti-inflammatory drugs for use during pregnancy. MATERIALS AND METHODS: The pregnant females were randomly divided into 5 groups. Control group received a hydroalcoholic solution (1.2%), via gavage, for at least 15 days prior to mating and throughout the gestational period. The pre-treatment group received Gochnatia polymorpha ethanol extract (GPEE), via gavage, at a dose of 100mg/kg body weight (b.w.) for at least 15 days prior to mating and up to the appearance of the vaginal plug. The organogenesis group received GPEE at a dose of 100mg/kg (b.w.), via gavage, on the 5-15th gestacional day. The pregnancy group received GPEE at a dose of 100mg/kg (b.w.), via gavage, throughout the gestational period (from the 1st to the 18th day of pregnancy). The pre+pregnancy group received GPEE at a dose of 100mg/kg (b.w.), via gavage, for at least 15 days prior to mating and throughout the entire gestational period. The clinical signals of maternal toxicity and teratogenesis were evaluated. Additional assays to evaluate chronic inflammation, antigenotoxicity and immunomodolatory activity were performed. RESULTS AND CONCLUSIONS: The results indicated that GPEE does not interfere with reproductive performance or embryo-fetal development but does correlate with reduced weight and fetal length. The extract was not teratogenic or mutagenic or an immunomodulator. However, GPEE did exhibit effective anti-inflammatory activity. Based on this study, it can be inferred that GPEE is an important, safe anti-inflammatory agent for use during pregnancy according to the experimental design we utilized, which opens up possibilities for the bioprospecting of a new anti-inflammatory phytotherapy for use during pregnancy.

Asunto(s)

Antiinflamatorios no Esteroideos/toxicidad , Asteraceae/química , Desarrollo Embrionario/efectos de los fármacos , Desarrollo Fetal/efectos de los fármacos , Organogénesis/efectos de los fármacos , Extractos Vegetales/toxicidad , Animales , Antiinflamatorios no Esteroideos/aislamiento & purificación , Antiinflamatorios no Esteroideos/uso terapéutico , Recuento de Células Sanguíneas , Edema/tratamiento farmacológico , Etnofarmacología , Femenino , Masculino , Exposición Materna , Ratones , Pruebas de Micronúcleos , Tamaño de los Órganos/efectos de los fármacos , Fagocitosis/efectos de los fármacos , Extractos Vegetales/aislamiento & purificación , Extractos Vegetales/uso terapéutico , Embarazo , Bazo/citología

RESUMEN

Resorcinolic lipids have important biological actions, including anti-carcinogenic activity. Therefore, we evaluated the mutagenic, genotoxic, immunomodulatory and apoptotic potential and the biochemical and histopathological changes caused by the synthetic resorcinolic lipid 3-Heptyl-3,4,6-trimethoxy-3H-isobenzofuran-1-one, (AMS35AA; 10, 20 and 40 mg/kg) alone or in combination with cyclophosphamide (100 mg/kg) in Swiss mice. The results indicated that AMS35AA is not genotoxic or mutagenic and does not alter liver or kidney histology. However, the compound does cause an increase (p < 0.05) in the levels of glutamic-oxaloacetic transaminase and creatinine and in splenic phagocytosis and liver and kidney apoptosis. When combined with cyclophosphamide, AMS35AA caused increased (p < 0.05) mutagenic damage (although the compound had anti-genotoxic activity), splenic phagocytosis, neutropenia and glutamic-oxaloacetic transaminase and creatinine levels (even in the absence of histological damage) and induced liver and kidney apoptosis. We conclude that this resorcinolic lipid may be an important chemotherapy adjuvant that can potentiate mutagenic damage and increase apoptosis caused by cyclophosphamide without causing adverse effects. In addition, the immunomodulatory activity of the compound should be noted, which counters reductions in lymphocyte number, a primary side effect of cyclophosphamide in cancer therapy.

Asunto(s)

Antineoplásicos/farmacología , Apoptosis/efectos de los fármacos , Ciclofosfamida/farmacología , Factores Inmunológicos/farmacología , Lípidos/farmacología , Mutágenos/farmacología , Resorcinoles/farmacología , Animales , Antineoplásicos/administración & dosificación , Antineoplásicos/síntesis química , Antineoplásicos/química , Protocolos de Quimioterapia Combinada Antineoplásica , Ensayo Cometa , Ciclofosfamida/administración & dosificación , Factores Inmunológicos/administración & dosificación , Factores Inmunológicos/síntesis química , Factores Inmunológicos/química , Lípidos/administración & dosificación , Lípidos/síntesis química , Lípidos/química , Masculino , Ratones , Mutágenos/administración & dosificación , Mutágenos/síntesis química , Mutágenos/química , Neoplasias/tratamiento farmacológico , Resorcinoles/administración & dosificación , Resorcinoles/síntesis química , Resorcinoles/química

RESUMEN

Ample evidence suggests that cancer is triggered by mutagenic damage and diets or supplements capable of reducing such incidences can be related to the prevention of neoplasy development or to an improvement in life quality of patients who undergo chemotherapy. This research aimed to evaluate the antimutagenic and antigenotoxic activity of ß-glucan. We set up 8 experimental groups: control (Group 1), cyclophosphamide (Group 2), Groups 3-5 to assess the effect of ß-glucan administration, and Groups 6-8 to evaluate the association between cyclophosphamide and ß-glucan. The intraperitonial concentrations of ß-glucan used were 100, 150 and 200 mg/kg. Micronucleus and comet assays showed that within the first week of treatment ß-glucan presented a damage reduction rate between 100-62.04% and 94.34-59.52% for mutagenic and genotoxic damages, respectively. This activity decreased as the treatment was extended. During the sixth week of treatment antimutagenicity rates were reduced to 59.51-39.83% and antigenotoxicity was not effective. This leads to the conclusion that the efficacy of ß-glucan in preventing DNA damage is limited when treatment is extended, and that its use as a chemotherapeutic adjuvant need to be better clarified.

RESUMEN

This study aimed to evaluate the quimiopreventive ability of phenylalanine. We used pregnant and non-pregnant female mice divided into the following groups: G1-PBS, (0.1 mL/kg b.w); G2, cyclophosphamide (35 mg/kg p.c.-i.p.); G3 and G4, phenylalanine (150 and 300 mg/kg b.w respectively-v.o.) and G5 and G6, association between the two doses of phenylalanine and cyclophosphamide, respectively. The peripheral blood samples were taken at T0, before the administration of any drug test and / or vehicles, also at T24 and T48 where the collections were made 24 and 48 h after administration of cyclophosphamide, respectively. A general analysis has found that, for the group of non-pregnant female, the antimutagenic evaluation showed reduction percentages of damage of 57.24 percent and 31.64 percent for G5 and G6, respectively, at T24, and 29.32 percent and 24.13 percent for G5 and G6, respectively, at T48. Antimutagenic pregnant animals in the 24 h quimiopreventive efficiency shown only for the lower dose (G5) and the percentages of reduction were 43.25 percent in G5 and G6 at 18.47 percent. At T48 the harm-reduction percentages were 44.67 percent and 37.76 percent for G5 and G6, respectively.

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A presente pesquisa teve por objetivo avaliar a capacidade quimiopreventiva da fenilalanina. Utilizou-se um lote de fêmeas prenhes e não prenhes divididas nos seguintes grupos experimentais: G1, PBS (0,1 mL/kg p.c.); G2, ciclofosfamida (35 mg/kg p.c.-i.p.); G3, fenilalanina (150 mg/kg p.c.-v.o.) e G4, fenilalanina (300 mg/kg p.c.-v.o.) e G5 (150 mg/kg p.c. de fenilalanina e 35 mg/kg de ciclofosfamida); G6, (300 mg/kg p.c. de fenilalanina e 35 mg/kg de ciclofosfamida). As coletas de sangue periférico foram realizadas em T0, antes da administração de qualquer substância teste e/ou veículos, e igualmente em T24 e T48, onde as coletas foram realizadas respectivamente 24 e 48 h após a administração da ciclofosfamida. Em uma análise geral verificou-se que, para o grupo de fêmeas não prenhes, a avaliação da antimutagenicidade demonstrou porcentagens de redução de danos de 57,24 por cento e 31,64 por cento para G5 e G6, respectivamente, em T24, e 29,32 por cento e 24,13 por cento para G5 e G6, respectivamente, em T48. Nos animais prenhes a antimutagenicidade de 24 h demonstrou eficiência quimiopreventiva apenas para a menor dose (G5) e as porcentagens de redução de danos foram de 43,25 por cento em G5 e 18,47 por cento em G6. No momento T48 as porcentagens de redução de danos foram de 44,67 por cento e 37,76 por cento para G5 e G6, respectivamente.

RESUMEN

This research has evaluated the effects of enteral supplementation of glutamine in clastogens and genotoxic damages caused by the acute administration of cisplatin. For this, it was utilized Swiss mice distributed in eight experimental groups: control, cisplatin, glutamine, in three different doses and the combination of these with cisplatin. The results show that the glutamine was present in neither genotoxic nor mutagenic activity. When in association with glutamine and cisplatin, in simultaneous treatment, it was verified the frequency decreased of micronuclei and comets. The damage reduction percentages to the micronucleus ranged from 95.4 to 91.8% after 24h of administration of these compounds and 76.7 to 56.8% after 48h. In the same time the damage reduction percentages to the comet test ranged from 117.0 to 115.0%. The results suggest that glutamine is capable of preventing genotoxic and mutagenic damage according to the experimental design proposed.