LEANDRO EZIQUIEL DE SOUZA
Índice h a partir de 2011
7
Projetos de Pesquisa
Unidades Organizacionais
Instituto do Coração, Hospital das Clínicas, Faculdade de Medicina
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conferenceObject Impact of sympathectomy upon myocardium(2019) PESSOA, F. Fernanda; JORDAO, M. R.; FONSECA, K. C. B.; ZANONI, F.; SALEMI, V. M. C.; RIBEIRO, O. N.; SOUZA, L. E.; FERNANDES, F.; IRIGOYEN, M. C.; MOREIRA, L. F. P.; MADY, C.; RAMIRES, F. J. A.conferenceObject IMPACT OF ANGIOTENSIN CONVERTING ENZYME (ACE) GENE LEVELS ON BAROREFLEX IMPAIRMENT AND SYMPATHETIC HYPERACTIVITY AFTER A HIGH FRUCTOSE DIET(2017) MORAES-SILVA, Ivana C.; SOUZA, Leandro E. de; CASARINI, Dulce E.; IRIGOYEN, Maria-ClaudiaconferenceObject Baroreflex and cardiac dysfunctions evaluated by transesophageal echocardiography, baroreflex sensitivity, autonomic control and invasive measurements in rats submitted to sinoaortic denervation(2012) SIRVENTE, R. A.; IRIGOYEN, M. C.; SOUZA, L.; MOSTARDA, C.; FUENTE, R. La; CANDIDO, G.; SOUZA, P.; MEDEIROS, A.; MADY, C.; SALEMI, V. M. C.Purpose: Sympathetic hyperactivity commonly seems to be related to cardiac dysfunction and baro and chemoreflexes impairment in hypertension. However, myocardial function has not been evaluated regarding the association of hypertension and baroreflex dysfunction using transesophageal echocardiography. Methods: Exercise test (ET), baroreflex sensitivity, cardiovascular autonomic control, transthoracic and transesophageal echocardiography using intracardiac echocardiographic catheter (AcuNav, Siemens, Mountain View, CA, USA), and invasively biventricular end-diastolic pressures (EDP) were evaluated in rats 10 weeks after sinoaortic denervation (SAD). The rats (n=32) were divided in 4 groups: 16 Wistar (W) with (n=8) or without SAD (n=8) and 16 spontaneously hypertensive rats (SHR) with (n=8) or without SAD (n=8). Results: Blood pressure (BP) and heart rate (HR) did not show any change between the groups SAD and without SAD, although, SHR showed higher BP levels in comparison to W. BP variability was increased in SHR groups compared to W. After SAD, BP variability increased in all groups compared to W (W: 15 mmHg2; *DSA: 49 mmHg2; *SHR: 60 mmHg2; *SHR-SAD:137 mmHg2, *p<0.05 vs. W). Exercise tests results showed that SHR had better functional capacity compared to SAD and SHRSAD (W: 1.16m/s; DSA: 0.9m/s; *SHR: 1.46; SHR-DSA: 1.02, *p<0.05 vs. SAD and SHRSAD). Left ventricular concentric hypertrophy, segmental systolic dysfunction and global diastolic LV dysfunction, segmental and global systolic dysfunction, and global diastolic RV dysfunction, indirect signals of pulmonary arterial hypertension were shown by echocardiography, mostly evident in SHRSAD. The RV-EDP increased in all groups compared to W(W:3±0.39mmHg, *SAD:4.7±0.52mmHg, *SHR: 6.6±1.1mmHg, *SHRSAD:7.8±0.87mmHg, *p<0.05 vs. W), and LV-EDP increased in SHR and SHRSAD groups compared to W, and in SHRSAD compared to SAD (W: 5,83±0,19 mmHg,SAD: 8.98±1.2 mmHg, *SHR: 12.51±4.73 mmHg, *#SHRSAD: 14.57±2.52mmHg, *p<0.05vs.W,#p<0.05 vs. DSA). There was a relation between invasive or noninvasive measurements of RV showing good accuracy of echocardiographic measurements. Conclusions: Our results suggest that baroreflex dysfunction impaired biventricular function. Moreover, the findings of RV dysfunction indicate that SAD may lead to increased pulmonary artery pressure, supporting a role for baroreflex dysfunction in the pathogenesis of the hypertensive cardiac disease.conferenceObject Effects of aerobic exercise training on obese female mice: metabolic and autonomic evaluation(2013) SARTORI, Michelle; SOUZA, Leandro Eziquiel de; SOUZA, Pamella Ramona de; SANTOS, Fernando; ANGELIS, Katia De; IRIGOYEN, Maria ClaudiaThe aim of this study was to evaluate the metabolic and autonomic parameters in trained youth obese mice. Female ob/ob mice (4 weeks old) were randomized into sedentary (OS, n=11) or trained (OT, n=8) (treadmill,5 days/w, 60 min/d, during 8 wks) groups. Blood glucose was measured by reagent strips. Blood pressure signals were recorded using a data acquisition system. The OT group had higher exercise capacity compared to the OS group. OT group had reduced body weight, white adipose tissue and blood glucose (45±2g, 6.1±1g and 133±3g mg/dL) compared to OS group (50±2g, 6.1±1g and 169±8 mg/dL). Exercise training improved glucose tolerance in trained group (OS: 27961±6501 vs. OT: 18258±6283 mg/dL/min). Mean arterial pressure and heart rate were similar between groups. The trained group showed increase in heart rate variability compared with sedentary group (OT: 50±12 vs. OS: 33±8ms2). Blood pressure variability and low frequency band were higher in OS group (23 ± 3mmHg2 and 7 ± 1 mmHg2) compared to OT (15 ± 2 mmHg2 and 5 ± 1 mmHg2). Moreover, the spontaneous baroreflex sensitivity, represented by alpha index, was lower in sedentary group (1.2 ± 0.3 ms/mmHg) compared to trained group (1.9 ± 0.2 ms/mmHg). In conclusion, our results suggest that physical training during lifespan can be effective inattenuating the increase in weight and blood glucose and improving blood pressure variability in obese mice.- Cardiac dysfunction in Pkd1-deficient mice with phenotype rescue by galectin-3 knockout(2016) BALBO, Bruno E.; AMARAL, Andressa G.; FONSECA, Jonathan M.; CASTRO, Isac de; SALEMI, Vera M.; SOUZA, Leandro E.; SANTOS, Fernando dos; IRIGOYEN, Maria C.; QIAN, Feng; CHAMMAS, Roger; ONUCHIC, Luiz F.Alterations in myocardial wall texture stand out among ADPKD cardiovascular manifestations in hypertensive and normotensive patients. To elucidate their pathogenesis, we analyzed the cardiac phenotype in Pkd1(cond/cond) Nestin(cre) (CYG+) cystic mice exposed to increased blood pressure, at 5 to 6 and 20 to 24 weeks of age, and Pkd1(+/-) (HTG+) noncystic mice at 5-6 and 10-13 weeks. Echocardiographic analyses revealed decreased myocardial deformation and systolic function in CYG+ and HTG+ mice, as well as diastolic dysfunction in older CYG+ mice, compared to their Pkd1(cond/cond) and Pkd1(+/+) controls. Hearts from CYG+ and HTG+ mice presented reduced polycystin-1 expression, increased apoptosis, and mild fibrosis. Since galectin-3 has been associated with heart dysfunction, we studied it as a potential modifier of the ADPKD cardiac phenotype. Double-mutant Pkd1(cond/cond):Nestin(cre);Lgals(3-/-) (CYG-) and Pkd1(+/-);Lgals(3-/-) (HTG-) mice displayed improved cardiac deformability and systolic parameters compared to single -mutants, not differing from the controls. CYG- and HTG- showed decreased apoptosis and fibrosis. Analysis of a severe cystic model (Pkd1(v/v); VVG+) showed that Pkd1(v/v);Lgals(3-/-) (VVG-) mice have longer survival, decreased cardiac apoptosis and improved heart function compared to VVG+. CYG- and VVG- animals showed no difference in renal cystic burden compared to CYG+ and VVG+ mice. Thus, myocardial dysfunction occurs in different Pkdl-deficient models and suppression of galectin-3 expression rescues this phenotype.
- Cardiovascular autonomic dysfunction in non-obese diabetic mice(2013) MORAES, Oscar A.; COLUCCI, Juliana A.; SOUZA, Leandro E.; SCAPINI, Katia B.; MORAES-SILVA, Ivana C.; MOSTARDA, Cristiano; ANGELIS, Katia De; CASARINI, Dulce E.; IRIGOYEN, Maria ClaudiaIt is known that diabetes is associated with autonomic dysfunction; however, data about autonomic function in non-obese diabetic mice (NOD) remain scarce. We evaluated the autonomic profile of NOD mice. Female mice, 24-28 week old, were divided in two groups: NOD (n = 6) and control (n = 6, Swiss mice). NOD mice with glycemia >= 300 mg/dl were used. Heart rate variability (HRV) and arterial pressure variability (APV) in time and frequency domains, symbolic analysis of heart rate (HR) and baroreflex sensitivity were evaluated. HR and arterial pressure (AP) were similar between the groups; however, HRV (total variance of RR interval: NOD = 21.07 +/- 3.75 vs. C = 42.02 +/- 6.54 ms(2)) and the vagal modulation index RMSSD were lower in NOD group (4.01 +/- 032 vs. 8.28 +/- 0.97 ms). Moreover, the absolute and normalized low-frequency (LF) components were also enhanced in NOD (normalized = 61.0 +/- 4.0%) as compared to control mice (normalized = 20.0 +/- 4.0%). Both the absolute and normalized high-frequency (HF) components were lower in NOD (normalized = 39.0 +/- 4.0%) when compared to the control group (normalized = 80.0 +/- 4.0). In the symbolic analysis the 0V pattern, an indication of sympathetic activity, was higher in NOD and 2LV pattern, an indication of parasympathetic activity, was lower in the NOD than in the control group. Both bradycardic and tachycardic responses were decreased in NOD (3.01 +/- 0.72 vs. 4.54 +/- 0.36 bpm/mm Hg and 2.49 +/- 031 vs. C = 3.43 +/- 033 bpm/mm Hg) when compared to the control group. Correlation analysis showed negative correlations between vagal indexes (RMSSD, %HF and 2LV) and glycemic levels. In conclusion, NOD mice develop severe diabetes correlated with autonomic dysfunction.
- PROINFLAMMATORY ROLE OF ANGIOTENSIN II IN THE AORTA OF NORMOTENSIVE MICE(2018) LIMA, R. S.; SILVA, J. C. S.; LIMA, C. T.; SOUZA, L. E.; BALADI, M. G.; IRIGOYEN, M. C.; LACCHINI, S.
conferenceObject The metabolic mechanisms involved in the heart protection from myocardial infarction induced by diabetes(2012) MALFITANO, Christiane; CARBONARO, M.; SOUZA JUNIOR, A. L. de; ALBA-LOUREIRO, T. C.; SOUZA, L. E.; FIGUEROA, D.; SILVA, K.; CURI, R.; IRIGOYEN, M. C.conferenceObject Interval training program improves cardiac function and physical performance in heart failure mice(2013) ABAD, Cesar Cavinato Cal; MOSTARDA, Cristiano Teixeira; NASCIMENTO, Ademir Manuel; SANTOS, Mirailton Alves dos; SOUZA, Leandro Eziquiel; FIGUEROA, Diego M. T.; SANTOS, Fernando; SOUZA, Pamella Ramona Moraes de; ANGELIS, Katia De; IRIGOYEN, Maria ClaudiaThis study was designed to verify the effect of an eight week interval training program (IT) in systolic and diastolic functions and physical performance in heart failure mice (C57B16, n=24). The animals were divided in three groups: 1) Intact sedentary (C), 2) infarcted sedentary (MI-s); and 3) infarcted trained (MI-i). At the begining (M1) and at the end of IT (M2), time of maximal running performance (Tvmáx) was quantified. The ejection fraction (EF), shortening fraction (SF) and isovolumetric relaxation time (IVRT) were accessed by echocardiography in M2. At 60 days after coronary artery occlusion the IT was started (4min at 80% Vmáx x 4min at 40% Vmáx during 60min). The results are presented in mean and SEM. Myocardial infarction area was not different between groups in both evaluation time (M1vsM2). The EF and SF in MI-s were lower than C (44±3.7vs58±3.0% and 22±2vs31±2%, respectively; p≤0.05) but similar between MI-i and C (56±5vs58±3% and 25±3vs31±2%, respectively). The IVRT was higher (p≤0.05) in MI-s (25.6±4ms) than C (13±1ms) while similar in MI-i (15±0.8ms) and C. At the M1 both MI-s and MI-i Tvmáx decreased in comparison with C (620±16 and 644±28vs840±17s, respectively). At the M2, Tvmáx delta percent was higher in MI-i than MI-s (64±8vs15±6%, respectively; p≤0.05) and C (0.53±3%). The results suggest that IT improves cardiac function and physical performance in heart failure mice.conferenceObject Reversal of Cardiac Remodeling After Surgical Intervention Leads to Distinct Cardiac Function Outcomes.(2017) JENSEN, Leonardo; SILVA, Amanda Almeida; OLIVEIRA, Nataly Cunha; SOUZA, Leandro Eziquiel de; IRIGOYEN, Maria Claudio Costa