Tesis sobre el tema "F07C - MALATTIE DELL'APPARATO CARDIOVASCOLARE"
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Valgimigli, Marco <1972>. "Correlazione tra i livelli circolanti di cellule staminali CD34+ e sviluppo di ristesosi binaria in pazienti sottoposti ad angioplastica coronarica con impianto di stent metallico tradizionale: studio prospettico osservazionale". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/146/1/Tesi_dottorato_di_ricerca_Marco_Valgimigli.pdf.
Texto completoValgimigli, Marco <1972>. "Correlazione tra i livelli circolanti di cellule staminali CD34+ e sviluppo di ristesosi binaria in pazienti sottoposti ad angioplastica coronarica con impianto di stent metallico tradizionale: studio prospettico osservazionale". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/146/.
Texto completoBiagini, Elena <1973>. "Storia naturale e stratificazione prognostica della cardiomiopatia ipertrofica: nuove acquisizioni". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/522/1/biagini.pdf.
Texto completoBiagini, Elena <1973>. "Storia naturale e stratificazione prognostica della cardiomiopatia ipertrofica: nuove acquisizioni". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/522/.
Texto completoLofiego, Carla <1975>. "Il "ritardo evitabile" nella diagnosi di sindrome aortica acuta: analisi dei determinanti clinici e possibili ripercussioni sull'outcome". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/523/1/lofiego.pdf.
Texto completoLofiego, Carla <1975>. "Il "ritardo evitabile" nella diagnosi di sindrome aortica acuta: analisi dei determinanti clinici e possibili ripercussioni sull'outcome". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/523/.
Texto completoRusso, Antonio <1972>. "Nuove acquisizioni in termini di insufficienza mitralica: complicanze tromboemboliche dopo chirurgia della valvola mitrale: incidenza, predittori e implicazioni cliniche". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/524/1/russo.pdf.
Texto completoRusso, Antonio <1972>. "Nuove acquisizioni in termini di insufficienza mitralica: complicanze tromboemboliche dopo chirurgia della valvola mitrale: incidenza, predittori e implicazioni cliniche". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/524/.
Texto completoValzania, Cinzia <1975>. "La terapia elettrica di resincronizzazione cardiaca". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/838/1/Tesi_Valzania_Cinzia.pdf.
Texto completoValzania, Cinzia <1975>. "La terapia elettrica di resincronizzazione cardiaca". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/838/.
Texto completoGiardini, Alessandro <1974>. "Multicenter european study on the prognostic value of cardiopulmonary exercise test in adults with atrial repair for complete transposition of the great arteries". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/839/1/Tesi_Giardini_Alessandro.pdf.
Texto completoGiardini, Alessandro <1974>. "Multicenter european study on the prognostic value of cardiopulmonary exercise test in adults with atrial repair for complete transposition of the great arteries". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/839/.
Texto completoMerli, Elisa <1974>. "Applicazioni cliniche dello studio della deformazione miocardica mediante metodiche ultrasonore". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/840/1/Tesi_Merli_Elisa.pdf.
Texto completoMerli, Elisa <1974>. "Applicazioni cliniche dello studio della deformazione miocardica mediante metodiche ultrasonore". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/840/.
Texto completoBaldazzi, Federica <1976>. "Rilascio dei biomarkers di danno miocardico dopo iniezione diretta per via percutanea di cellule staminali e terapia genica". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/2099/1/baldazzi_federica_tesi.pdf.
Texto completoBaldazzi, Federica <1976>. "Rilascio dei biomarkers di danno miocardico dopo iniezione diretta per via percutanea di cellule staminali e terapia genica". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/2099/.
Texto completoDiemberger, Igor <1976>. "Stategie di trattamento elettrico nei pazienti con insufficienza cardiaca: valutazione dei risultati a distanza". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/2100/1/igor_diemberger_tesi.pdf.
Texto completoDiemberger, Igor <1976>. "Stategie di trattamento elettrico nei pazienti con insufficienza cardiaca: valutazione dei risultati a distanza". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/2100/.
Texto completoMariucci, Maria Elisabetta <1976>. "Tachicardie atriali nel cardiopatico congenito adulto:incidenza, morbilità, e ruolo dell'ablazione transcatetere". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2468/1/mariucci_mariaelisabetta_tesi.pdf.
Texto completoMariucci, Maria Elisabetta <1976>. "Tachicardie atriali nel cardiopatico congenito adulto:incidenza, morbilità, e ruolo dell'ablazione transcatetere". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2468/.
Texto completoTaglieri, Nevio <1976>. "Combined Evaluation of ST-segment Elevation in lead AVR and ST-segment Depression in other Leads Enhances Prediction of in-hospital Cardiovascular Death in Patients with Non ST-segment Elevation Acute Coronary Syndrome". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2616/1/taglieri_nevio_tesi.pdf.
Texto completoTaglieri, Nevio <1976>. "Combined Evaluation of ST-segment Elevation in lead AVR and ST-segment Depression in other Leads Enhances Prediction of in-hospital Cardiovascular Death in Patients with Non ST-segment Elevation Acute Coronary Syndrome". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2616/.
Texto completoBertini, Matteo <1976>. "Resincronizzazione cardiaca: razionale, selezione dei pazienti ed ottimizzazinone della terapia". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2648/1/BERTINI.MATTEO.TESI.pdf.
Texto completoBertini, Matteo <1976>. "Resincronizzazione cardiaca: razionale, selezione dei pazienti ed ottimizzazinone della terapia". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2648/.
Texto completoRiva, Letizia <1977>. "Fisiopatologia, clinica, storia naturale e terapia delle cardiomiopatie amiloidotiche". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2949/1/RIVA_LETIZIA_tesi.pdf.pdf.
Texto completoRiva, Letizia <1977>. "Fisiopatologia, clinica, storia naturale e terapia delle cardiomiopatie amiloidotiche". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2949/.
Texto completoDomenichini, Giulia <1979>. "Cardiac pacing and biventricular dysfunction - methods of assessment and therapeutic implications". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3654/1/Domenichini_Giulia_tesi.pdf.
Texto completoDomenichini, Giulia <1979>. "Cardiac pacing and biventricular dysfunction - methods of assessment and therapeutic implications". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3654/.
Texto completoPalazzini, Massimiliano <1978>. "Analisi dei fattori prognostici e della risposta al trattamento nei pazienti con ipertensione arteriosa polmonare". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3808/1/palazzini_massimiliano_tesi.pdf.
Texto completoPalazzini, Massimiliano <1978>. "Analisi dei fattori prognostici e della risposta al trattamento nei pazienti con ipertensione arteriosa polmonare". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3808/.
Texto completoPasquale, Ferdinando <1978>. "Prevalenza, espressione fenotipica e prognosi dei pazienti affetti da cardiomiopatia ipertrofica dovuta a mutazioni del gene della Troponina T". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3812/1/Pasquale_Ferdinando_Tesi.pdf.
Texto completoPasquale, Ferdinando <1978>. "Prevalenza, espressione fenotipica e prognosi dei pazienti affetti da cardiomiopatia ipertrofica dovuta a mutazioni del gene della Troponina T". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3812/.
Texto completoBalducci, Anna <1978>. "Effetto dell’allenamento fisico sulla capacità cardiopolmonare in pazienti adulti con ventricolo destro sistemico: studio europeo multicentrico". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3868/1/Balducci_Anna_tesi.pdf.
Texto completoBalducci, Anna <1978>. "Effetto dell’allenamento fisico sulla capacità cardiopolmonare in pazienti adulti con ventricolo destro sistemico: studio europeo multicentrico". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3868/.
Texto completoHasan, Tammam <1978>. "Non invasive assessment of right ventricle in patients with operated tetralogy of Fallot". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4383/1/HASAN-TAMMAM-Valutazione_non_invasiva_del_ventricolo_destro_nei_pazienti_con_tetralogia_di_Fallot_sottoposti_ad_intervento_correttivo.pdf.
Texto completoHasan, Tammam <1978>. "Non invasive assessment of right ventricle in patients with operated tetralogy of Fallot". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4383/.
Texto completoIonico, Teresa <1980>. "Efficacia e sicurezza della profilassi anti-citomegalovirus rispetto alla strategia pre-sintomatica con valganciclovir in pazienti con trapianto di cuore trattati con everolimus o micofenolato". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4640/1/Ionico_Teresa_Tesi.pdf.
Texto completoCytomegalovirus (CMV) is the most clinically relevant infectious agent in heart transplant (HT) recipients. Although antiviral agents used in prophylaxis seem superior to a pre-emptive approach to reduce CMV burden and its consequences, the impact of the additional anti-CMV effect of everolimus (EVE) on the benefit of antiviral prophylaxis is currently unexplored. We analyzed the interaction of anti-CMV strategy and the use of EVE or mycophenolate (MMF) on the occurrence of CMV events in de novo HT recipients. METHODS AND MATERIALS: Consecutive HT recipients surviving at least 6 months after surgery, treated with either EVE or MMF, and transplanted between 2005 and 2010 entered the study. Oral valganciclovir or i.v. ganciclovir were used for pre-emptive or prohylaxis strategy. CMV infection was regularly monitored with CMV DNA PCR and pp65 antigenemia in all patients. CMV disease/syndrome was the main outcome event. RESULTS: 191 patients (11% D+/R-) entered the study (44 on EVE and 147 on MMF). Overall, CMV infection (45% vs. 78%), need for CMV treatment (20% vs. 53%), CMV disease/syndrome (2% vs. 15%), and peak CMV burden (4 vs. 27 pp65cells/205) were significantly lower in EVE than in MMF treated recipients (all P<0.01). Prophylaxis resulted more effective in preventing all these outcomes than pre-emptive strategy in MMF patients (all P 0.03), but not in EVE treated patients. Of note, EVE patients followed with pre-emptive approach showed less CMV infection (48 vs 70%; P=0.05), and less CMV syndrome/disease (0 vs. 8%; P=0.05) than MMF patients receiving prophylaxis. CONCLUSIONS: EVE-based immunosuppression showed a clinically relevant impact on all acute CMV outcomes as compared with MMF. The benefit of anti-CMV prophylaxis is retained only in MMF treated patients and EVE seems to provide an overall advantage in reducing acute CMV events without the need of extensive treatment with antiviral drugs.
Ionico, Teresa <1980>. "Efficacia e sicurezza della profilassi anti-citomegalovirus rispetto alla strategia pre-sintomatica con valganciclovir in pazienti con trapianto di cuore trattati con everolimus o micofenolato". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4640/.
Texto completoCytomegalovirus (CMV) is the most clinically relevant infectious agent in heart transplant (HT) recipients. Although antiviral agents used in prophylaxis seem superior to a pre-emptive approach to reduce CMV burden and its consequences, the impact of the additional anti-CMV effect of everolimus (EVE) on the benefit of antiviral prophylaxis is currently unexplored. We analyzed the interaction of anti-CMV strategy and the use of EVE or mycophenolate (MMF) on the occurrence of CMV events in de novo HT recipients. METHODS AND MATERIALS: Consecutive HT recipients surviving at least 6 months after surgery, treated with either EVE or MMF, and transplanted between 2005 and 2010 entered the study. Oral valganciclovir or i.v. ganciclovir were used for pre-emptive or prohylaxis strategy. CMV infection was regularly monitored with CMV DNA PCR and pp65 antigenemia in all patients. CMV disease/syndrome was the main outcome event. RESULTS: 191 patients (11% D+/R-) entered the study (44 on EVE and 147 on MMF). Overall, CMV infection (45% vs. 78%), need for CMV treatment (20% vs. 53%), CMV disease/syndrome (2% vs. 15%), and peak CMV burden (4 vs. 27 pp65cells/205) were significantly lower in EVE than in MMF treated recipients (all P<0.01). Prophylaxis resulted more effective in preventing all these outcomes than pre-emptive strategy in MMF patients (all P 0.03), but not in EVE treated patients. Of note, EVE patients followed with pre-emptive approach showed less CMV infection (48 vs 70%; P=0.05), and less CMV syndrome/disease (0 vs. 8%; P=0.05) than MMF patients receiving prophylaxis. CONCLUSIONS: EVE-based immunosuppression showed a clinically relevant impact on all acute CMV outcomes as compared with MMF. The benefit of anti-CMV prophylaxis is retained only in MMF treated patients and EVE seems to provide an overall advantage in reducing acute CMV events without the need of extensive treatment with antiviral drugs.
Gallelli, Ilaria <1979>. "L'Amiloidosi transtiretino correlata ereditaria: profilo clinico, fisiopatologico e storia naturale". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4697/1/Gallelli_Ilaria_tesi.pdf.
Texto completoGallelli, Ilaria <1979>. "L'Amiloidosi transtiretino correlata ereditaria: profilo clinico, fisiopatologico e storia naturale". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4697/.
Texto completoCiliberti, Paolo <1979>. "Ruolo del test da sforzo cardiopolmonare nei pazienti affetti da cardiomiopatia ipertrofica in età pediatrica". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4919/1/Ciliberti_Paolo_tesi.pdf.
Texto completoCiliberti, Paolo <1979>. "Ruolo del test da sforzo cardiopolmonare nei pazienti affetti da cardiomiopatia ipertrofica in età pediatrica". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4919/.
Texto completoZiacchi, Matteo <1977>. "Strategie di personalizzazione della terapia di resincronizzazione cardiaca". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5332/1/Ziacchi_Matteo_tesi.pdf.
Texto completoOnly 60% of the candidates for biventricular pacing responds in terms of left ventricular reverse remodeling that appears to be the strongest predictor of reduction in hospitalizations and mortality. The causes of non-response are not clear, but they could be found in the setting of the device and in the limitations of transvenous approach. I studied three problems looking strategies tailoring therapy of cardiac re synchronization to reduce the number of patients non-responders. The first study evaluates the interventricular delay. In order to optimize resources and provide a real benefit to the patient I researched the presence of predictors of the interventricular delay different from simultaneous, set in the basic programming. The only predictor of interventricular delay is QRS interval >160ms, so I proposed a flow chart to optimize only those patients who have a range in programming optimal interventricular not simultaneous. The second paper evaluates the active fixation of left ventricular lead. The displacements, the high threshold of myocardial stimulation and stimulation of the phrenic nerve appear to be three major problems that limit the biventricular pacing. We analyzed more than 200 angiograms to see the anatomical conditions predisposing displacement. Prospectively we decided to use a stent for the establishment of active left ventricular lead in all patients presenting with the anatomical features favoring the displacement. The active fixation has eliminated the problem of dislocations, improved response in terms of reverse ventricular remodeling and did not alter the electrical parameters of the lead. The third work evaluates left ventricular endocardial pacing. We implanted 26 patients judged to be non-responders to cardiac resynchronization therapy. The procedure was safe having a risk of complications at all comparable to classic biventricular pacing and effective in arresting the degeneration of heart failure and / or improve the clinical effects in the midterm follow-up.
Ziacchi, Matteo <1977>. "Strategie di personalizzazione della terapia di resincronizzazione cardiaca". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5332/.
Texto completoOnly 60% of the candidates for biventricular pacing responds in terms of left ventricular reverse remodeling that appears to be the strongest predictor of reduction in hospitalizations and mortality. The causes of non-response are not clear, but they could be found in the setting of the device and in the limitations of transvenous approach. I studied three problems looking strategies tailoring therapy of cardiac re synchronization to reduce the number of patients non-responders. The first study evaluates the interventricular delay. In order to optimize resources and provide a real benefit to the patient I researched the presence of predictors of the interventricular delay different from simultaneous, set in the basic programming. The only predictor of interventricular delay is QRS interval >160ms, so I proposed a flow chart to optimize only those patients who have a range in programming optimal interventricular not simultaneous. The second paper evaluates the active fixation of left ventricular lead. The displacements, the high threshold of myocardial stimulation and stimulation of the phrenic nerve appear to be three major problems that limit the biventricular pacing. We analyzed more than 200 angiograms to see the anatomical conditions predisposing displacement. Prospectively we decided to use a stent for the establishment of active left ventricular lead in all patients presenting with the anatomical features favoring the displacement. The active fixation has eliminated the problem of dislocations, improved response in terms of reverse ventricular remodeling and did not alter the electrical parameters of the lead. The third work evaluates left ventricular endocardial pacing. We implanted 26 patients judged to be non-responders to cardiac resynchronization therapy. The procedure was safe having a risk of complications at all comparable to classic biventricular pacing and effective in arresting the degeneration of heart failure and / or improve the clinical effects in the midterm follow-up.
Borghi, Claudia <1980>. "Ruolo dell'elettrocardiogramma standard nella stratificazione prognostica della cardiomiopatia ipertrofica. Studio multicentrico". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5384/1/borghi_claudia_tesi.pdf.
Texto completoThe purpose of this study was to investigate the prognostic significance of standard electrocardiogram (ECG) in a large cohort of patients with hypertrophic cardiomyopathy (HCM). In this multicenter study 841 HCM patients (66% men, mean age 48±17 yrs) were followed for 7.1±7.1 years and the first collected ECG was considered for the analysis. The results showed that independent predictors of sudden cardiac death were unexplained syncope (p 0.004), ST segment elevation and/or giant positive T waves (p 0.048), QRS duration >= 120 ms (p 0.017). Two models has been contructed to predict the risk of sudden death: the first based on the already well known established risk factors (wall thickness >= 30 mm, non-sustained ventricular tachycardia on ECG Holter monitoring, syncope and family history of sudden death) and the second with the addition of ST segment elevation/giant positive T waves and QRS duration >= 120 ms. Whereas both models stratified patients according to the number of risk factors, the second model showed a higher predictive power (chi-square from 12 to 22, p 0.002). In conclusion in HCM standard ECG has a prognostic value and improves the current risk stratification model.
Borghi, Claudia <1980>. "Ruolo dell'elettrocardiogramma standard nella stratificazione prognostica della cardiomiopatia ipertrofica. Studio multicentrico". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5384/.
Texto completoThe purpose of this study was to investigate the prognostic significance of standard electrocardiogram (ECG) in a large cohort of patients with hypertrophic cardiomyopathy (HCM). In this multicenter study 841 HCM patients (66% men, mean age 48±17 yrs) were followed for 7.1±7.1 years and the first collected ECG was considered for the analysis. The results showed that independent predictors of sudden cardiac death were unexplained syncope (p 0.004), ST segment elevation and/or giant positive T waves (p 0.048), QRS duration >= 120 ms (p 0.017). Two models has been contructed to predict the risk of sudden death: the first based on the already well known established risk factors (wall thickness >= 30 mm, non-sustained ventricular tachycardia on ECG Holter monitoring, syncope and family history of sudden death) and the second with the addition of ST segment elevation/giant positive T waves and QRS duration >= 120 ms. Whereas both models stratified patients according to the number of risk factors, the second model showed a higher predictive power (chi-square from 12 to 22, p 0.002). In conclusion in HCM standard ECG has a prognostic value and improves the current risk stratification model.
Cavallini, Claudia <1976>. "Un estere misto degli acidi ialuronico, butirrico e retinoico è in grado di agire come rimodellante inverso della matrice cellulare sui fibroblasti cardiaci". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5744/1/tesi_Claudia_Cavallini.pdf.
Texto completoMyocardial dysfunction resulting from myocardial infarction is a widespread and important cause of morbidity and mortality. Due to scar- and ischemia-related postinfarction events, clinical manifestations are enormous and heterogeneous. Damaged left ventricle undergoes progressive ‘‘remodelling’’, with myocyte slippage and fibroblast proliferation, resulting in distorted organ architecture and function. Cardiac fibroblasts (CFs) are principally responsible for fibrosis; a scarring process characterized by excessive deposition of extra cellular matrix (ECM) proteins. In the past year we’ve already explored new solution to this growing problem, and our effort focused on a chemical compound, HBR, able to improve the cardiac commitment of stem cells. HBR is a glycoconjugate of hyaluronan, butirric and retinoic acid. Our in vivo study showed that direct injection of HBR on infarcted heart is able, amongst other things, to reduce cardiac fibrosis. On the basis of this evidence, we did a step back, trying to discover pathways and cellular mechanisms involved in this reduced fibrosis in vivo, focusing on in vitro study on rat fibroblasts. Here we demonstrate that HBR was able to act directly on CFs limiting their activation and their biological activities. HBR acted on cell number, arresting cell proliferation, without any cytotoxic effects. Regarding ECM deposition, HBR lead a significative reduction of collagen deposition mediated by CFs. HBR acted on gene expression and protein synthesis, suppressing collagen gene expression, as well as myofibroblast differentiation through α-sma inhibition and promoting vasculogenesis (up regulation of VEGF), stem cell recruitment (up regulation of SDF) and had antifibrotic activity (downregulation of CTGF). HBR seems to modulate gene expression acting directly on HDAC proteins, effect probably due to BU moiety. The ability of our HBR to reduce fibrosis after MI, as demonstrated in our in vivo and in vitro study, opens an interesting therapeutic prospective.
Cavallini, Claudia <1976>. "Un estere misto degli acidi ialuronico, butirrico e retinoico è in grado di agire come rimodellante inverso della matrice cellulare sui fibroblasti cardiaci". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5744/.
Texto completoMyocardial dysfunction resulting from myocardial infarction is a widespread and important cause of morbidity and mortality. Due to scar- and ischemia-related postinfarction events, clinical manifestations are enormous and heterogeneous. Damaged left ventricle undergoes progressive ‘‘remodelling’’, with myocyte slippage and fibroblast proliferation, resulting in distorted organ architecture and function. Cardiac fibroblasts (CFs) are principally responsible for fibrosis; a scarring process characterized by excessive deposition of extra cellular matrix (ECM) proteins. In the past year we’ve already explored new solution to this growing problem, and our effort focused on a chemical compound, HBR, able to improve the cardiac commitment of stem cells. HBR is a glycoconjugate of hyaluronan, butirric and retinoic acid. Our in vivo study showed that direct injection of HBR on infarcted heart is able, amongst other things, to reduce cardiac fibrosis. On the basis of this evidence, we did a step back, trying to discover pathways and cellular mechanisms involved in this reduced fibrosis in vivo, focusing on in vitro study on rat fibroblasts. Here we demonstrate that HBR was able to act directly on CFs limiting their activation and their biological activities. HBR acted on cell number, arresting cell proliferation, without any cytotoxic effects. Regarding ECM deposition, HBR lead a significative reduction of collagen deposition mediated by CFs. HBR acted on gene expression and protein synthesis, suppressing collagen gene expression, as well as myofibroblast differentiation through α-sma inhibition and promoting vasculogenesis (up regulation of VEGF), stem cell recruitment (up regulation of SDF) and had antifibrotic activity (downregulation of CTGF). HBR seems to modulate gene expression acting directly on HDAC proteins, effect probably due to BU moiety. The ability of our HBR to reduce fibrosis after MI, as demonstrated in our in vivo and in vitro study, opens an interesting therapeutic prospective.
Frascari, Irene <1982>. "Sistemi endorfinergici e modulazione di segnali molecolari e profili trascrizionali coinvolti in processi di protezione e autoriparazione del miocardio danneggiato". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5818/1/frascari_irene_tesi.pdf.
Texto completoIschemic preconditioning (IPC), the exposure of the heart to short cycles of sublethal ischemia before a prolonged ischemic damage, is a phenomenon able to provide a considerable resistance to myocardial infarct, one of the most prominent cause of disability and death in the world. Recent studies suggest that IPC can improve survival, homing, and engrafment of stem cells in ischemic areas and that it can constitute a new therapeutic strategy to enhance stem cell cardioprotective therapy, a developing research area. IPC is difficult to apply in clinical practice, but is well known that opioids and their receptors are cardioprotective and that they activate signaling pathways involved in IPC; for this reasons opioids are suitable candidate for a possible pharmacological therapy alternative to IPC. Given these assumptions, the purpose of the present study was to investigate whether conditioning cardiomyocytes with opioid receptor agonists Dynorphin B, DADLE e Met-Enkephalin could protect cells from apoptosis caused by an ischemic environment and whether it could induce the damaged cells to produce factors capable to attract stem cells. To tests this hypothesis we developed an in vitro model of “ischemic microenvironment” applied to H9c2 rat cardiomyoblasts. Preconditiong the cells in a “sustained” way (24 hours of opioids preconditioning followed by 24 hours of induction of damage, keeping on administering the opioid peptides) with Dynorphin B and DADLE leads to a direct protection from apoptosis. Thereafter, migration and adhesion assays showed that DADLE drives “ischemic” H9c2 to create a microenvironment capable to attract human Mesenchymal stem cells (FMhMSCs) and to improve FMhMSC grafting abilities. Moreover, the results obtained until now suggest that the ability of the ischaemic microenvironment conditioned with DADLE to attract FMhMSC could be ascribed to chemokines upregulation in H9c2.
Frascari, Irene <1982>. "Sistemi endorfinergici e modulazione di segnali molecolari e profili trascrizionali coinvolti in processi di protezione e autoriparazione del miocardio danneggiato". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5818/.
Texto completoIschemic preconditioning (IPC), the exposure of the heart to short cycles of sublethal ischemia before a prolonged ischemic damage, is a phenomenon able to provide a considerable resistance to myocardial infarct, one of the most prominent cause of disability and death in the world. Recent studies suggest that IPC can improve survival, homing, and engrafment of stem cells in ischemic areas and that it can constitute a new therapeutic strategy to enhance stem cell cardioprotective therapy, a developing research area. IPC is difficult to apply in clinical practice, but is well known that opioids and their receptors are cardioprotective and that they activate signaling pathways involved in IPC; for this reasons opioids are suitable candidate for a possible pharmacological therapy alternative to IPC. Given these assumptions, the purpose of the present study was to investigate whether conditioning cardiomyocytes with opioid receptor agonists Dynorphin B, DADLE e Met-Enkephalin could protect cells from apoptosis caused by an ischemic environment and whether it could induce the damaged cells to produce factors capable to attract stem cells. To tests this hypothesis we developed an in vitro model of “ischemic microenvironment” applied to H9c2 rat cardiomyoblasts. Preconditiong the cells in a “sustained” way (24 hours of opioids preconditioning followed by 24 hours of induction of damage, keeping on administering the opioid peptides) with Dynorphin B and DADLE leads to a direct protection from apoptosis. Thereafter, migration and adhesion assays showed that DADLE drives “ischemic” H9c2 to create a microenvironment capable to attract human Mesenchymal stem cells (FMhMSCs) and to improve FMhMSC grafting abilities. Moreover, the results obtained until now suggest that the ability of the ischaemic microenvironment conditioned with DADLE to attract FMhMSC could be ascribed to chemokines upregulation in H9c2.