Normal or improved cardiovascular risk factors in IGF-I-deficient adults with growth hormone receptor deficiency.

BACKGROUND: Human subjects with generalized growth hormone (GH) insensitivity due to GH receptor deficiency (GHRD)/Laron syndrome display a very low incidence of insulin resistance, diabetes, and cancer, as well as delayed age-related cognitive decline. However, the risk of cardiovascular disease (CVD) in these subjects is poorly understood. Here, we have assessed cardiovascular function, damage, and risk factors in GHRD subjects and their relatives. METHODS: We measured markers of CVD in two phases: one in a cohort of 30 individuals (GHRD = 16, control relatives = 14) brought to USC (in Los Angeles, CA) and one in a cohort including additional individuals examined in Ecuador (where the subjects live) for a total of 44 individuals (GHRD = 21, control relatives = 23). Data were collected on GHRD and control groups living in similar geographical locations and sharing comparable environmental and socio-economic circumstances. RESULTS: Compared to controls, GHRD subjects displayed lower serum glucose, insulin, blood pressure, smaller cardiac dimensions, similar pulse wave velocity, lower carotid artery intima-media thickness, lower creatinine, and a non-significant but major reduction in the portion of subjects with carotid atherosclerotic plaques (7% GHRDs vs. 36%, Controls p = 0.1333) despite elevated low-density lipoprotein cholesterol levels. CONCLUSION: The current study indicates that individuals with GHRD have normal or improved levels of cardiovascular disease risk factors as compared to their relatives. FUNDING: This study was funded in part by NIH/NIA grant P01 AG034906 to V.D.L.

Determinación de los niveles séricos de vitamina D en los pacientes diagnosticados con Esclerosis múltiple y su relación con la severidad y el comportamiento de la enfermedad en el "Hospital Metropolitano de Quito" y en el "Hospital Carlos Andrade Marín" / Determination of vitamin D serum levels in patients diagnosed with multiple sclerosis and their relationship with the severity and illness behavior in the Metropolitan Hospital in Quito and Carlos Andrade Marín Hospital

Introducción: El estudio pretende relacionar los niveles séricos de vitamina D, en pacientes con Esclerosis Múltiple (EM), con la severidad y el comportamiento de la enfermedad. Materiales y Métodos: Reclutamos 81 pacientes con EM, de los cuales se obtuvo una muestra de 50 pacientes para compararlos con 50 sujetos sanos, pareados por edad, sexo y color de la piel. La severidad de la enfermedad se evaluó con la escala de Kurtzke, número de recaídas, exposición solar, etc. Resultados: La concentración sérica de vitamina D en pacientes con EM (M=31.9 SD=12.3 ng/ml) fue similar a la de los controles (M=30.3 SD= 8.0 ng/ml; p=0.53). La prevalencia de insuficiencia de vitamina D fue del 42% (n=21) entre los casos y 46% (n=23) entre los controles, p>0.05). Se calculó la relación entre los niveles óptimos de Vitamina D (> 40, ng/ml) con un bajo grado de discapacidad, definida como un valor en la escala de Kurtzke < 3.5 [χ2(1, N=100)= 3.13 p=0.3]. El promedio de vitamina D en los pacientes con más de una recaída fue de 31.0 ng /ml y con menos de una recaída, 32.5 ng/ml fue similar (p=0.66). Discusión: No hubo diferencia significativa en las concentraciones séricas de vitamina D en pacientes con EM y sujetos sanos, pareados por género, edad y color de la piel. No hubo correlación entre el nivel de vitamina D y el grado de discapacidad medido por la escala de Kurtzke ni con el número de recaídas.

Introduction: The study seeks to relate vitamin D serum levels in Multiple Sclerosis (MS) patients with disease severity and its progression. Methods: From eighty one MS patients enrolled, fifty were selected to compare to healthy subjects, paired according to age, gender and skin color. Disease severity was assessed using the Kurtzke severity scale, relapses number, solar exposure. Results: The mean vitamin D serum concentration in MS patients (M= 31.9 SD=12.3 ng/ml) was similar to controls' (M=30.31 SD=8.0 ng/ml; p=0.53). The prevalence of vitamin D insufficiency was 42% (n=22) among cases and 46% (n=23) among controls (p=0.91). The relationship between an optimal vitamin D serum concentration (>40 ng/ml) and a low grade of disability, using a cutoff point in the Kurtzke scale < 3.5, was assessed and a non-significant correlation was found [χ2(1, N=100)= 3.13 p=0.3]. The mean vitamin D level among patients with more than one relapse (M=31.0 ng/ml) was similar to those with less than one relapse (M=32.49, p=0.66). Discusion: There was no difference of vitamin D serum levels between MS patients and the general population. A weak and not significant correlation was found with the degree of disability, measured by the Kurtzke severity scale, and also with the number of relapses.