Spatial Distribution of the Cannabinoid Type 1 and Capsaicin Receptors May Contribute to the Complexity of Their Crosstalk

The cannabinoid type 1 (CB1) receptor and the capsaicin receptor (TRPV1) exhibit co-expression and complex, but largely unknown, functional interactions in a subpopulation of primary sensory neurons (PSN). We report that PSN co-expressing CB1 receptor and TRPV1 form two distinct sub-populations based on their pharmacological properties, which could be due to the distribution pattern of the two receptors. Pharmacologically, neurons respond either only to capsaicin (COR neurons) or to both capsaicin and the endogenous TRPV1 and CB1 receptor ligand anandamide (ACR neurons). Blocking or deleting the CB1 receptor only reduces both anandamide- and capsaicin-evoked responses in ACR neurons. Deleting the CB1 receptor also reduces the proportion of ACR neurons without any effect on the overall number of capsaicin-responding cells. Regarding the distribution pattern of the two receptors, neurons express CB1 and TRPV1 receptors either isolated in low densities or in close proximity with medium/high densities. We suggest that spatial distribution of the CB1 receptor and TRPV1 contributes to the complexity of their functional interaction

Is flourishing good for the heart? Relationships between positive psychology characteristics and cardiorespiratory health

Introducción: Muchos estudios han demostrado que las características psicológicas positivas son factores de protección contra las enfermedades cardiovasculares. El objetivo de este estudio es ampliar los datos conocidos acerca de las relaciones entre las cualidades positivas y los parámetros cardiorrespiratorios, incluida la rigidez arterial. Método: Las hipótesis fueron contrastadas transversalmente en una muestra clínica de pacientes con enfermedades cardiovasculares y otra muestra de pacientes sanos. La satisfacción en la vida, el bienestar psicológico, el optimismo, el sentido de la vida y el sentimiento de coherencia fueron considerados indicadores psicológicos, mientras que las variables fisiológicas tenidas en cuenta fueron la presión arterial periférica y central, la rigidez arterial, el ciclo cardiaco y la función respiratoria. La relación entre las variables dependientes e independientes, ajustadas por sexo, edad y nivel educativo se analizó mediante un modelo lineal. También se examinaron las relaciones no lineales entre las variables dependientes e independientes. Resultados: La mayoría de las asociaciones estudiadas no fueron significativas para ninguna de las dos muestras, aunque con algunas excepciones notables: la satisfacción en la vida se relacionó con una tensión arterial sistólica periférica menor, así como con una presión arterial media más baja en la muestra clínica. El sentido de la coherencia se asoció positivamente al volumen respiratorio forzado. En la muestra sana, el índice aórtico y la presión arterial sistólica presentaron una asociación negativa con el optimismo; sin embargo, utilizando la corrección de Bonferroni, ninguna de las relaciones lineales o no lineales resultaron significativas en las muestras. Conclusiones: estudios futuros deberán determinar si estos hallazgos derivan de las características culturales de estas muestras en concreto, o si los mediadores entre la salud psicológica y la salud cardiorrespiratoria deberían ser buscados más allá de las variables incluidas en este estudio.The purpose of this study was to provide further data on the relationships between positive psychology constructs and cardiorespiratory parameters including arterial stiffness indicators. Hypotheses were tested cross-sectionally on a sample of patients with cardiovascular disease and on a healthy sample. Life satisfaction, psychological well-being, optimism, meaning in life, and sense of coherence were included as psychological indicators, while peripheral and central blood pressure, arterial stiffness, and heart cycle and respiratory function parameters were used as physiological variables. Most of the associations examined were not significant in either sample, with some notable exceptions (the direction of these linear relationships was in accordance with our expectations). Satisfaction with life was related to lower peripheral systolic and mean arterial blood pressure in the clinical sample. Further, sense of coherence was positively associated with forced expiratory volume. In the healthy sample, the augmentation indexes and aortic systolic blood pressure were negatively associated with optimism. However, none of the linear and non-linear relationships proved to be significant in either of the samples when using the Bonferroni correction. Further research should determine whether the present findings derive from the cultural characteristics of our samples or whether the mediators between flourishing and cardiorespiratory health should be sought among other variables than the ones included in the present investigation