RESUMO
The cancer metastatic process is supported by the strong AKT hydrogen bond network. This network is formed by positive feedback loops generated in the cancer hypoxic microenvironment through the genomic AKT signaling locus. Laser paired photons disrupt the hydrogen network of the AKT active site by laser catalyzed fusion inducing the disappearance of the malignant phenotype. Paired photons increase photon density and energy at the target, inducing fusion of the AKT hydrogen network in cancer. Thus, targeting the network of the AKT active site by paired photons laser guided electrons catalyzes fusion and dismantles the hydrogen bond network, causing conversion of hydrogen into deuterium or helium. This results in the disappearance of cancer complexity, robustness, and malignant phenotype, leading to cancer cell apoptosis and effective clinical applications.
Assuntos
Hidrogênio/metabolismo , Lasers , Neoplasias/enzimologia , Proteínas Proto-Oncogênicas c-akt/metabolismo , Apoptose , Domínio Catalítico , Humanos , Neoplasias/patologia , Microambiente TumoralRESUMO
Metastatic cancer is caused by hyperactivated lysosomes. Such activation causes a fungus, Aspergillus fumigatus, to permanently activate the AKT gene network that controls the lysosome through positive feedback loops. Targeting such a network by the redox balance change, and with an antifungal medication eliminates the metastatic phenotype, the complexity and robustness of the cancer. This principal mechanism of gene targeting, which suppressed metastasis of unknown origin, was observed clinically.
Assuntos
Antifúngicos/uso terapêutico , Aspergillus fumigatus/patogenicidade , Neoplasias/microbiologia , Proteínas Proto-Oncogênicas c-akt/genética , Aspergillus fumigatus/efeitos dos fármacos , Humanos , Lisossomos/efeitos dos fármacos , Lisossomos/microbiologia , Metástase Neoplásica/tratamento farmacológico , Metástase Neoplásica/genética , Neoplasias/tratamento farmacológico , Neoplasias/patologia , Fosforilação/efeitos dos fármacos , Transdução de Sinais , Microambiente Tumoral/efeitos dos fármacosRESUMO
Hyperactivated lysosome causes cancer and induces metastasis or cancer relapse. Such activation occurs during excessive, intense, and protracted oxidative burst in the lysosome. The burst induces the formation of the constitutively active (permanently active) AKT locus generating cancer complexity and robustness. Such condition has the tendency to persist by stabilized intense signaling inducing upregulation of cell function and metabolic setup at the higher level. Most intense activator of the lysosome is the fungus Aspergillus fumigatus, which activates the AKT, a critical element in lysosome control, inducing cancer development, metastatic progression, or cancer relapse. Targeting the AKT active site of hydrogen network, by redox balance change or hydrogen balance change or muon-catalyzed fusion or laser-induced fusion with anti- A. fumigatus medication converts active AKT locus into inactive element, inducing disappearance of malignant phenotype.
Assuntos
Lisossomos/metabolismo , Neoplasias/enzimologia , Neoplasias/patologia , Proteínas Proto-Oncogênicas c-akt/metabolismo , Aspergillus fumigatus/fisiologia , Autofagia , Humanos , Metástase NeoplásicaRESUMO
A cancer microenvironment generates strong hydrogen bond network system by the positive feedback loops supporting cancer complexity and robustness. Such network functions through the AKT locus generating high entropic energy supporting cancer metastatic robustness. Charged lepton particle muon follows the rule of Bragg effect during a collision with hydrogen network in cancer cells. Muon beam dismantles hydrogen bond network in cancer by the muon-catalyzed fusion, leading to apoptosis of cancer cells. Muon induces cumulative energy appearance on the hydrogen bond network in a cancer cell with its fast decay to an electron and two neutrinos. Thus, muon beam, muonic atom, muon neutrino shower, and electrons simultaneously cause fast neutralization of the AKT hydrogen bond network by the conversion of hydrogen into deuterium or helium, inactivating the hydrogen bond networks and inducing failure of cancer complexity and robustness with the disappearance of a malignant phenotype.
Assuntos
Ligação de Hidrogênio/efeitos da radiação , Mésons/uso terapêutico , Neoplasias/radioterapia , Proteínas Proto-Oncogênicas c-akt/genética , Humanos , Neoplasias/patologia , Fosforilação/efeitos da radiação , Proteínas Proto-Oncogênicas c-akt/efeitos da radiação , Transdução de Sinais/efeitos da radiação , Microambiente Tumoral/efeitos da radiaçãoRESUMO
Generation and maintenance of a cancer complexity and robustness are impossible without hydrogen element. It is essential element for the cancer signaling through the AKT locus. Hyperactivated AKT locus by a positive feedback loops from the cancer hypoxic microenvironment generates a hydrogen bond network. Such network initiates protein-protein interaction at the AKT active site and at the same time stabilizes signal propagation. A hydrogen bond network conforms an entropy/enthalpy energetic process used for the interconversion of the AKT protein in metastasis formation and maintenance. Targeting the AKT locus by the redox balance change or hydrogen balance change or proton beam radiation disrupts a hydrogen bond network leading to the disappearance of a cancer complexity and robustness causing failure of the complex energy system in solid cancers and hematological malignancy. J. Cell. Biochem. 119: 130-133, 2018. © 2017 Wiley Periodicals, Inc.
Assuntos
Neoplasias/enzimologia , Proteínas Proto-Oncogênicas c-akt/química , Humanos , Ligação de Hidrogênio , Proteínas Proto-Oncogênicas c-akt/metabolismo , Transdução de SinaisRESUMO
Cancer of unknown primary site is a metastasis developed by the positive feedback loops of primary cancer forming extreme cancer robustness. Such robustness occurs only in metastatic cancer or in relapsed lymphoma, myeloma, plasmocytoma, or leukemia. However, when it develops in primary cancer, hypoxic microenvironment generates positive feedback loops which hyperactivate AKT locus, forming extreme robustness that forcing cancer cells to migrate to the distant site, but primary cancer loosing that property or remains silent. Positive loops are the force and principal mechanism of metastasis development. A cancer cell is converted normal cell. Conversion occurs at the AKT genomic locus. Thus, cancer is genomic disease rather than disease of the specific organs. Targeting such locus by the locus chemotherapy (redox balance change) rather than by organ specific therapy results in conversion of positive loops into negative and disappearance of extreme robustness and malignant phenotype of the cancer unknown primary origin.
Assuntos
Retroalimentação Fisiológica , Neoplasias Primárias Desconhecidas/metabolismo , Proteínas Proto-Oncogênicas c-akt/metabolismo , Transdução de Sinais , Movimento Celular , Humanos , Modelos Biológicos , Microambiente TumoralRESUMO
A cancer positive-feedback loops conversion is the phenomenon and principal mechanism for AKT locus chemotherapy. Such chemotherapy is the approach to target cancer robustness and complexity through the AKT signaling locus. The hypoxic cancer microenvironment generates a powerful signaling interactome with positive-feedback loops that generates cancer robustness through the AKT locus. This complexity and robustness can be successfully halted in leukemia, lymphoma, myeloma, plasmocytoma, sarcoma, and carcinoma by converting cancer positive-feedback loops into negative-feedback loops, achieved through the AKT dephosphorylation by redox balancing change. The hyperphosphorylated AKT locus is down-regulated completely to AKT dephosphorylation by redox balancing change, causing conversion of positive-feedback loops and the disappearance of malignant robustness as a direct effect of AKT locus chemotherapy.
Assuntos
Antineoplásicos/uso terapêutico , Neoplasias/tratamento farmacológico , Neoplasias/patologia , Proteínas Proto-Oncogênicas c-akt/metabolismo , Transdução de Sinais/efeitos dos fármacos , Microambiente Tumoral/efeitos dos fármacos , Humanos , Neoplasias/metabolismo , FosforilaçãoRESUMO
Cancer robustness is generated by the positive feedback loops. The positive loops hyperactivate AKT locus forming a cancer phenotype in leukemia, lymphoma, myeloma, plasmocytoma, sarcoma and carcinoma. The positive loops inducing AKT hyperphosphorylation increase activity of the AKT locus and the nodal associated and interconnected signaling genes. Only genes expressed above the threshold in the AKT signaling interactome networks, participate in the formation of the complex cancer phenotype. AKT is the switching locus for the cancer phenotype. The phenotype formation and maintenance is regulated by the AKT locus through an entropy/enthalpy processes. Targeting the AKT by locus chemotherapy, changing redox balance (antioxidant/oxidant), affects phosphorylation and activity of the AKT, inducing conversion of the positive feedback loops and disappearance of the malignant phenotype.
Assuntos
Neoplasias/metabolismo , Proteínas Proto-Oncogênicas c-akt/metabolismo , Animais , Humanos , Neoplasias/patologia , Fosforilação/genética , Fosforilação/fisiologia , Proteínas Proto-Oncogênicas c-akt/genética , Transdução de Sinais/genética , Transdução de Sinais/fisiologiaRESUMO
Diffuse large B-cell lymphoma (DLBCL) is the most frequent, complex and heterogeneous lymphoma of adulthood. Heterogeneity is expressed at clinical, genetic, and molecular levels. It is known that BCL-6 expression is a favorable prognostic factor in DLBCL. However, the underlying mechanisms of BCL-6 expression in DLBCL relapse are not yet elucidated. Here, we present so far undescribed clinical phenomenon of switching BCL-6(+) protein expression into BCL-6(-) expression in 19 of 41 relapsed DLBCL patients. The switch in relapsed DLBCL was associated with more aggressive clinical course of the disease. Bone marrow infiltration and high IPI risk were more often present in BCL-6(-) patients. Significantly increased biochemical parameters, such as LDH, beta-2 macroglobulin, CRP, and ferritin have been found, as well as significantly decreased serum Fe, TIBC, and hemoglobin. A Ki-67 proliferation marker was considerably high in relapsed DLBCL, but without significant differences between BCL-6(+) and BCL-6(-) groups of patients. Thus, switching of the positive into negative BCL-6 expression during DLBCL relapse could be used as a prognostic factor and a valuable criterion for treatment decision.
RESUMO
Angiogenesis get full robustness in metastatic cancer, relapsed leukemia or lymphoma when complex positive feedback loop signaling systems become integrative. A cancer hypoxic microenvironment generates positive loops inducing formation of the vascular functional shunts. AKT is an upstream angiogenic locus of integrative robustness and fragility activated by the positive loops. AKT controls two downstream nodes the mTOR and NOS in nodal organization of the signaling genes. AKT phosphorylation is regulated by a balance of an oxidant/antioxidant. Targeting AKT locus represents new principle to control integrative angiogenic robustness by the locus chemotherapy.
Assuntos
Biomarcadores Tumorais/metabolismo , Neoplasias/irrigação sanguínea , Neoplasias/metabolismo , Neovascularização Patológica/metabolismo , Proteínas Proto-Oncogênicas c-akt/metabolismo , Regulação Neoplásica da Expressão Gênica/fisiologia , Humanos , Proteínas Proto-Oncogênicas c-akt/genética , Transdução de SinaisRESUMO
Complexity and robustness of cancer hypoxic microenvironment are supported by the robust signaling networks of autocrine and paracrine elements creating powerful interactome for multidrug resistance. These elements generate a positive feedback loops responsible for the extreme robustness and multidrug resistance in solid cancer, leukemia, myeloma, and lymphoma. Phosphorylated AKT is a cancer multidrug resistance locus. Targeting that locus by oxidant/antioxidant balance modulation, positive feedback loops are converted into negative feedback loops, leading to disappearance of multidrug resistance. This is a new principle for targeting cancer multidrug resistance by the locus chemotherapy inducing a phenomenon of loops conversion.
Assuntos
Neoplasias/tratamento farmacológico , Neoplasias/enzimologia , Proteínas Proto-Oncogênicas c-akt/metabolismo , Animais , Resistência a Múltiplos Medicamentos , Resistencia a Medicamentos Antineoplásicos , Humanos , FosforilaçãoRESUMO
A positive feedback loops induce extreme robustness in metastatic cancer, relapsed leukemia, myeloma or lymphoma. The loops are generated by the signaling interactome networks of autocrine and paracrine elements from cancer hypoxic microenvironment. The elements of the networks are signaling proteins synthesized in hypoxic microenvironment such as the vascular endothelial growth factor, HIF-1α, hepatocyte growth factor, and molecules nitric oxide and H(2)O(2). The signals from upstream or rebound downstream pathways are amplified by the short or wide positive feedback loops, hyperstimulating AKT-inducing cancer extreme robustness. Targeting the phosphorylated AKT locus by an oxidant/antioxidant modulation induces collapse of positive feedback loops and establishment of negative feedback loops leading to stability of the system and disappearance of cancer extreme robustness. This is a new principle for the conversion of cancer positive loops into negative feedback loops by the locus chemotherapy.
Assuntos
Neoplasias/fisiopatologia , Proteínas Proto-Oncogênicas c-akt/fisiologia , Retroalimentação Fisiológica , Humanos , Modelos Biológicos , Oxidantes/metabolismo , Fosforilação , Transdução de Sinais/fisiologia , Microambiente Tumoral/fisiologiaRESUMO
BACKGROUND: Thyroid hemiagenesis is a rare anomaly, more commonly seen on the left side (ratio 4:1) and in females (ratio 3:1). The first to describe this anomaly was Handfield Jones in 1852. CASE PRESENTATION: We present a 66 year old female patient with right thyroid hemiagenesis, parathyroid adenoma on the side of hemiagenesis and parathyroid hyperplasia on the contralateral side. The patient had neck pain and was diagnosed as Hashimto thyroiditis with hyperparathyroidism. Parathyroid hormone, thyroglobulin antibodies (Tg-Ab) and thyroid peroxidase antibodies (TPO-Ab) were elevated. Neck ultrasound and technetium 99mTc-methoxyisobutyl isonitrile (MIBI) scintigraphy confirmed the right thyroid hemiagenesis, but not adenoma of parathyroid glands. Intraoperatively, right thyroid hemiagenesis was confirmed and left loboistmectomy was performed with removal of left inferior hyperplastic parathyroid gland. Postoperative PTH (parathyroid hormone) levels were within normal range. Five months after the operation PTH level was elevated again with calcium values at the upper limit. MIBI scintigraphy was performed again which showed increased accumulation of MIBI in the projection of the right parathyroid gland. Surgical reexploration of the neck and excision of the right upper parathyroid adenoma was performed which was located behind cricoid laryngeal cartilage. After surgery a normalization of calcium and PTH occured. CONCLUSION: From available literature we have not found the case that described parathyroid adenoma on the side of thyroid hemiagenesis,with parathyroid hyperplasia on the contralateral side.
RESUMO
UNLABELLED: What's known on the subject? and What does the study add? Caveolae are specialised regions of bladder smooth muscle (BSM) cell membranes where specific signalling pathways are regulated. Caveolin proteins are involved in caveolar biogenesis and function as signal transduction regulators. Expression of caveolin-1, -2, and -3 has been previously identified in the bladder; however, the distribution and relative expression of these proteins have not been defined. The present data show significant differences in the spatial distribution of caveolin proteins throughout the bladder wall. Region dependent variations in the co-localisation of caveolin subtypes in detrusor SM were also detected. These findings support the premise that the unique spatial pattern of caveolin proteins associated with BSM cells may enable regionally distinct functional responses to common stimuli. OBJECTIVE: ⢠To determine the regional expression profile of caveolin isoforms (integral membrane proteins abundant in caveolae), the spatial relationships among caveolin proteins within specific smooth muscle (SM) regions and the extent of their molecular interactions in bladder SM (BSM). MATERIALS AND METHODS: ⢠Regional differences in the expression of caveolin family members were determined by quantitative reverse transcriptase-polymerase chain reaction and Western blot of RNA and protein extracted from the base, body and dome of rat bladders. ⢠To evaluate the distribution of caveolin-1 (Cav-1), Cav-2 and Cav-3 within the bladder, longitudinal tissue sections from the base to dome were processed for confocal microscopy and quantified for intensity of immunoreactivity (IR) and extent of co-localisation. ⢠Interactions among Cav-1, Cav-2 and Cav-3 were determined by co-immunoprecipitation. RESULTS: ⢠Differential expression of Cav-1 and Cav-3 was detected among bladder regions, with lowest expression in the bladder base relative to the dome. ⢠Cav-1 was highly expressed in all regions, although an increase in IR from submucosa to serosa was detected in each region. ⢠The distribution of Cav-2 IR generally paralleled Cav-1, but progressively decreased from submucosa to serosa in each region. ⢠Cav-3 expression predominated in the medial region of BSM increasing progressively from base to dome, but was poorly expressed in the outer SM layer particularly in the dome. ⢠Cav-1 co-precipitated extensively with both Cav-2 and Cav-3. Co-precipitation between Cav-3 and Cav-2 was also detected. CONCLUSIONS: ⢠The isoform-specific spatial distribution and distinct molecular interactions among caveolins in BSM may contribute to the contractile heterogeneity of BSM cells and facilitate differential modulation of responses to local stimuli. ⢠As BSM caveolae regulate key signalling processes involved in contraction, altered expression of caveolin proteins may generate a regional imbalance in contraction/relaxation responses, thus leading to bladder dysfunction.
Assuntos
Caveolinas/genética , DNA/genética , Regulação da Expressão Gênica , Contração Muscular/genética , Músculo Liso/metabolismo , Bexiga Urinária Hiperativa/genética , Bexiga Urinária/metabolismo , Animais , Western Blotting , Caveolinas/biossíntese , Modelos Animais de Doenças , Masculino , Microscopia Confocal , Músculo Liso/patologia , Músculo Liso/fisiopatologia , Ratos , Ratos Sprague-Dawley , Reação em Cadeia da Polimerase em Tempo Real , Bexiga Urinária/patologia , Bexiga Urinária/fisiopatologia , Bexiga Urinária Hiperativa/metabolismo , Bexiga Urinária Hiperativa/fisiopatologiaRESUMO
Angiogenesis in solid tumors is important for tumor growth, invasion, and metastasis. However, angiogenesis plays also an important role in hematological malignancies. We have analyzed the expression of vascular endothelial growth factor (VEGF) in the leukemic blast cells and microvessel density (MVD) in the bone marrow biopsy samples of the patients with acute lymphoblastic leukemia (ALL). Bone marrow MVD of the patients with ALL was significantly higher compared with normal controls and complete remission (P<0.001), but slightly lower than in patients with relapsed ALL (P>0.05). The bone marrow blast VEGF expression was significantly higher in newly diagnosed ALL patients, with predominant strong VEGF expression as compared with complete remission patients (who had negative or weak VEGF expression) (P<0.05), whereas initial values were slightly lower than in relapsed patients. There was a strong positive correlation between VEGF expression and MVD at presentation of ALL. Stronger expression of VEGF on blast cells indicates shorter overall survival in ALL. Furthermore, initial values of MVD had positive correlation with overall survival and leukemia-free survival (P=0.024 and P=0.017, respectively). Our data suggest that increased angiogenesis (confirmed by immunohistochemical expression of VEGF in leukemic blasts), and MVD may play an important role in the pathophysiology of ALL with prognostic implications. Thus, targeting VEGF pathway may bring the new approach for ALL treatment-using antiangiogenic drugs and tyrosine kinase inhibitors in combination with standard chemotherapy regimens.
Assuntos
Medula Óssea/irrigação sanguínea , Medula Óssea/metabolismo , Neovascularização Patológica/diagnóstico , Leucemia-Linfoma Linfoblástico de Células Precursoras/diagnóstico , Fator A de Crescimento do Endotélio Vascular/genética , Adulto , Medula Óssea/patologia , Feminino , Expressão Gênica , Humanos , Masculino , Microvasos/metabolismo , Microvasos/patologia , Pessoa de Meia-Idade , Neovascularização Patológica/genética , Leucemia-Linfoma Linfoblástico de Células Precursoras/genética , Leucemia-Linfoma Linfoblástico de Células Precursoras/mortalidade , Leucemia-Linfoma Linfoblástico de Células Precursoras/patologia , Prognóstico , Recidiva , Indução de Remissão , Análise de SobrevidaRESUMO
AIMS: Caveolae are specialized regions of the cell membrane that modulate signal transduction and alterations in these structures affect bladder smooth muscle (BSM) contraction. Since bladder dysfunctions are common in the elderly, we evaluated the effect of aging on the morphology of caveolae and caveolin protein expression in BSM. METHODS: Caveolar morphology (number, size, and depth) in BSM was determined from electron microscopy images of young (10 weeks), adult (6-month old), and old (12-month old) rat urinary bladders. Changes in expression levels of caveolin proteins with age were investigated by Western blot and immunofluorescence microscopy. Caveolin-3 gene expression was determined by real-time RT-PCR in young and 19-month-old rat bladders. RESULTS: Twelve-month-old animals exhibited 50% fewer BSM caveolae compared to young (P < 0.01). The area of caveolae was significantly decreased at 6 and 12 months. Despite a decrease in the number of BSM caveolae at 12 months, the expression of caveolin-1 and cavin-1 were unaltered with age. In contrast, caveolin-2 and caveolin-3 protein expression and immunoreactivity were reduced in BSM at 6 and 12 months of age. Caveolin-3 gene expression was also downregulated at 19 months compared to young animals. CONCLUSION: Biological aging significantly decreases BSM caveolae number and morphology with associated selective alteration in caveolin protein expression. Since caveolae are protected membrane regions that regulate signal transduction, age-related alterations in caveolae and caveolin protein expression could alter BSM contractility resulting in bladder dysfunctions of the elderly.
Assuntos
Envelhecimento/patologia , Cavéolas/patologia , Músculo Liso/patologia , Bexiga Urinária/patologia , Fatores Etários , Envelhecimento/metabolismo , Animais , Cavéolas/metabolismo , Caveolina 1/genética , Caveolina 1/metabolismo , Caveolina 2/genética , Caveolina 2/metabolismo , Caveolina 3/genética , Caveolina 3/metabolismo , Expressão Gênica , Masculino , Contração Muscular/fisiologia , Músculo Liso/metabolismo , Ratos , Ratos Sprague-Dawley , Bexiga Urinária/metabolismoRESUMO
The aim of this study was to evaluate the prognostic significance of international prognostic index (IPI), mantle cell lymphoma IPI (MIPI), simplified MIPI (sMIPI), and MIPI biological (MIPIb), as well as their correlation with immunophenotype, clinical characteristics, and overall survival (OS), in a selected group of 54 patients with advanced-stage mantle cell lymphoma (MCL), treated uniformly with CHOP. Seventeen patients had IV clinical stage (CS), while other 37 had leukemic phase at presentation. Diffuse type of marrow infiltration was verified in 68.5% and nodular in remainder patients. Extranodal localization (25.9%) included bowel (20.4%), pleural effusion, sinus, and palpebral infiltration. All of analyzed patients expressed typical MCL immunophenotypic profile: CD19(+)CD20(+)CD22(+)CD5(+)Cyclin-D1(+)FMC7(+)CD79b(+)smIg(+)CD38(+/-)CD23(-)CD10(-). Median OS of the whole group was 23 months, without significant differences between IV CS and leukemic phase patients. Thirty-two patients (59.3%) responded to initial treatment, 9 (16.7%) with complete and 23 (42.6%) with partial remission. Negative prognostic influence on OS had high IPI (P < 0.01), high sMIPI (P < 0.001), MIPI (P < 0.01), MIPIb (P < 0.01), extranodal localization (P < 0.01), and diffuse marrow infiltration (P < 0.01). Testing between randomly selected groups showed that patients with lower proportion of CD5(+) cells (<80%) correlated with cytological blastoid variant and had shorter survival comparing with the group with higher proportion of CD5(+) cells (>80%) (P < 0.01). Using univariate Cox regression, we proved that IPI, sMIPI, MIPI, and MIPIb had an independent predictive importance (P < 0.01) for OS in uniformly treated advanced MCL patients, although sMIPI prognostic significance was the highest (P < 0.001).
Assuntos
Linfoma de Célula do Manto/classificação , Linfoma de Célula do Manto/tratamento farmacológico , Linfoma de Célula do Manto/mortalidade , Adulto , Idoso , Idoso de 80 Anos ou mais , Protocolos de Quimioterapia Combinada Antineoplásica/administração & dosagem , Ciclofosfamida/administração & dosagem , Doxorrubicina/administração & dosagem , Feminino , Citometria de Fluxo , Humanos , Imuno-Histoquímica , Imunofenotipagem , Estimativa de Kaplan-Meier , Masculino , Pessoa de Meia-Idade , Prednisona/administração & dosagem , Prognóstico , Modelos de Riscos Proporcionais , Resultado do Tratamento , Vincristina/administração & dosagemRESUMO
PURPOSE: Clinical and basic research data suggest that pelvic ischemia may contribute to bladder overactivity. We characterized the molecular and ultrastructural reactions of the chronically ischemic bladder. MATERIALS AND METHOD: A model of pelvic ischemia was developed by creating iliohypogastric/pudendal arterial atherosclerosis in rabbits. At 12 weeks conscious urinary frequency was examined, bladder blood flow was recorded and cystometrograms were done using general anesthesia. Bladder tissue was processed for molecular and ultrastructural analysis using quantitative real-time polymerase chain reaction, Western blot and transmission electron microscopy. RESULTS: Conscious urinary frequency and the frequency of spontaneous bladder contractions significantly increased in animals with pelvic ischemia. Bladder ischemia up-regulated the gene and protein expression of hypoxia inducible factor-1α, transforming growth factor-ß and nerve growth factor B. Vascular endothelial growth factor gene expression also increased but protein levels were unchanged. Transmission electron microscopy of ischemic bladder samples showed swollen mitochondria with degraded granules, thickened epithelium, deformed muscle fascicles, collagen deposition and impaired microvasculature with thickened intima and disrupted endothelial cell junctions. Degenerating axonal and Schwann cell profiles, and myelin sheath splitting around axons and Schwann cells were evident in ischemic bladders. CONCLUSIONS: Interrupting pelvic blood flow resulted in an ischemic overactive bladder and significant increase in conscious urinary frequency. Molecular responses involving hypoxia inducible factor, transforming growth factor-ß, vascular endothelial growth factor and nerve growth factor were associated with mitochondrial injury, fibrosis, microvasculature damage and neurodegeneration. Ischemia may have a key role in bladder overactivity and lower urinary tract symptoms.
Assuntos
Bexiga Urinária Hiperativa/fisiopatologia , Bexiga Urinária/irrigação sanguínea , Bexiga Urinária/ultraestrutura , Animais , Western Blotting , Modelos Animais de Doenças , Epitélio/ultraestrutura , Regulação da Expressão Gênica/fisiologia , Subunidade alfa do Fator 1 Induzível por Hipóxia/metabolismo , Imuno-Histoquímica , Sintomas do Trato Urinário Inferior/fisiopatologia , Masculino , Microscopia Eletrônica de Transmissão , Microvasos/metabolismo , Microvasos/ultraestrutura , Contração Muscular , Músculo Liso/ultraestrutura , Fator de Crescimento Neural/metabolismo , Coelhos , Reação em Cadeia da Polimerase em Tempo Real , Fluxo Sanguíneo Regional , Fator de Crescimento Transformador beta/metabolismo , Regulação para Cima/fisiologia , Bexiga Urinária/fisiopatologiaRESUMO
OBJECTIVE: To seek markers of oxidative stress and examine neural structural integrity in chronic penile ischaemia using a rabbit model of arteriogenic erectile dysfunction (ED), as the role of ischaemia in penile neuropathy and the oxidative mechanism of neurodegeneration in ED remains unknown. MATERIALS AND METHODS: A rabbit model of atherosclerosis-induced ED was developed by partial balloon de-endothelialization of the iliac arteries. After 10 weeks, intracavernosal blood flow and erectile function in the arteriogenic ED group were compared with age-matched controls. Erectile tissues were processed for analysis of oxidative stress markers and nerve fibre density using enzyme immunoassay and immunohistochemical staining, respectively. Oxidative stress-sensitive genes were determined with quantitative real-time polymerase chain reaction. Tissue ultrastructure was examined by transmission electron microscopy. RESULTS: Significant erectile tissue ischaemia, erectile dysfunction, increased levels of oxidative products, and marked nitrotyrosine immunoreactivity was evident in the ED group. Oxidative stress-sensitive genes encoding hypoxia inducible factor-1alpha (HIF-1alpha), superoxide dismutase (SOD), aldose reductase (AR) and nerve growth factor (NGF) were up-regulated in the ischaemic erectile tissue. These changes were associated with collapsed axonal and Schwann cell profiles, neurodegeneration, mitochondrial structural damage, increased caveolae, loss of endothelium, and sporadic vacuolization. CONCLUSIONS: Neuropathy appears to follow the vascular insult in arteriogenic ED. Neural injury in penile ischaemia involves a neurovascular phenomenon mediated by oxidative free radicals. Mitochondrial structural damage and increased HIF-1alpha gene expression may be early signals of oxidative stress and neurodegeneration in ED. Up-regulation of SOD, AR and NGF may be a coordinated defensive reaction to oxidative radicals that seems to fail to prevent neural injury in the ischaemic penis. Our study introduces the concept of oxidative neurodegeneration in the pathophysiology of arteriogenic ED. Therapeutic strategies to protect penile nerves from free radical incursion may enhance the efficacy of surgical and pharmacological interventions in arteriogenic ED.
Assuntos
Impotência Vasculogênica/etiologia , Isquemia/complicações , Degeneração Neural/etiologia , Estresse Oxidativo/fisiologia , Pênis/irrigação sanguínea , Animais , Biomarcadores/metabolismo , Velocidade do Fluxo Sanguíneo/fisiologia , Pressão Sanguínea/fisiologia , Imuno-Histoquímica , Impotência Vasculogênica/fisiopatologia , Isquemia/fisiopatologia , Masculino , Degeneração Neural/fisiopatologia , Pênis/inervação , Coelhos , Distribuição AleatóriaRESUMO
PURPOSE: To our knowledge the mechanism of neurodegeneration in the overactive bladder remains unknown. We examined mitochondrial integrity and searched for markers of oxidative neural injury in the ischemic overactive bladder. MATERIALS AND METHODS: A rabbit model of overactive bladder was developed by inducing moderate pelvic ischemia. After 16 weeks cystometrograms and blood flow recordings from overactive bladders were compared with those in age matched controls. Bladder tissues were processed to assess oxidative products, oxidative stress sensitive genes and nerve fiber density using enzyme immunoassay, quantitative real-time polymerase chain reaction and immunohistochemical staining, respectively. Tissue ultrastructure was examined by transmission electron microscopy. RESULTS: Ischemia increased spontaneous bladder contractions and led to cyclic ischemia-reperfusion. Tissue levels of oxidative and nitrosative products, and oxidative stress sensitive genes encoding superoxide dismutase and aldose reductase were up-regulated in the overactive bladder. Transmission electron microscopy of overactive bladder tissues showed mitochondria with distinctive morphological features, characterized by swollen membranes, decreased granules, a total loss of granules and sporadic membrane damage. These changes were associated with sporadic loss of epithelial mucosal membrane, twisted smooth muscle cells, diffused vacuolization and marked neurodegeneration. CONCLUSIONS: Our findings suggest free radical mediated ultrastructural damage and neurodegeneration in the overactive bladder. Overactivity associated mitochondrial stress may have a central role in epithelial damage, smooth muscle cell injury and neurodegeneration. Superoxide dismutase and aldose reductase up-regulation in the overactive bladder imply intrinsic defensive reaction against free radicals that apparently fails to prevent oxidative damage and neurodegeneration. Therapeutic strategies targeting basic mitochondrial processes such as energy metabolism or free radical generation may help better manage wall degeneration and neuropathy in the overactive bladder.