Training induced effects on noradrenaline synthesis/storage within the skeletal muscle and renal arterioles in spontaneously hypertensive rats / Efeitos do treinamento físico sobre a síntese/armazenamento de noradrenalina em arteríolas musculares esqueléticas e renais de ratos hipertensos espontâneos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

We investigated the effects of training (T) on tyrosine hydroxylase (TH) density in arterioles and adrenals (neuro-hormoral responses). Male SHR were submitted to treadmill T (55% of maximal capacity) or kept sedentary (S). After AP and HR recordings, rats were anesthetized and tissues (soleus, gastrocnemius red, gracilis = locomotor; temporalis = non-locomotor muscle; kidney and adrenals) collected for Western Blot and immunohistochemistry. T improved treadmill performance (+77%) and reduced AP and HR (-6% and -10%, p<0.05). TH immunoreactivity was increased in locomotor muscles (+57%, p<0.05) with smaller changes on temporalis (+24%, p>0.05) without any change on kidneys. Enlarged arterioles wall/lumen ratio was reduced only in locomotor muscles; there was no change on adrenals TH content. T increases noradrenaline synthesis/storage on skeletal muscles arterioles, which represents a compensatory neural response to T-induced structural remodeling in order to maintain a near normal local flow. Absence of changes on temporalis TH suggests that neural response is modulated by local factors

ASSUNTO(S)

simpathetic system hidroxilase hipertensão arterioles shr treinamento físico tirosina hypertension physical training arteríolas shr tyrosine hydroxylase sistema nervoso simpático

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