Search for dissertations about: "guinea-pig ileum"
Found 5 swedish dissertations containing the words guinea-pig ileum.
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1. Studies on nitric oxide in autonomic neurotransmission
Abstract : The aim of the present thesis was to study nitric oxide (NO) as a mediator in autonomic neurotransmission in the enteric nervous system, including studies on the mechanism for neuronal release of NO, as well as the effects of NO on intestinal smooth muscle and enteric neurones. Furthermore, the signal transduction pathway for the evoked effects of NO and nitrergic neurotransmission were investigated. READ MORE
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2. Functional characterisation of receptors for cysteinyl leukotrienes in smooth muscle
Abstract : The cysteinyl leukotrienes (leukotriene C4, D4 and E4) have potent biological actions which significantly contribute to the airway obstruction in asthma. Several of these effects are blocked by drugs known as CysLT1-receptor antagonists, which have been introduced as new treatment for asthma. READ MORE
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3. Studies of receptors and modulatory mechanisms in functional responses to cysteinyl-leukotrienes in smooth muscle
Abstract : Cysteinyl-leukotrienes, i.e. leukotriene (LT) C4, D4 and E4, are inflammatory mediators and potent airway- and vasoconstrictors. Two different cysteinyl-leukotriene receptors have been cloned, CysLT, and CysLT2. READ MORE
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4. Modulation of the calcium-force relationship in smooth muscle by polyamines and metabolic inhibition
Abstract : The relationship between intracellular free calcium ([Ca2+]i) and force in smooth muscle was investigated in receptor-coupled permeabilized preparations and by fluorimetry of the calcium indicator Fura 2 in intact smooth muscle. The time integral of spontaneous [Ca2+]i transients in the intact rat portal vein was decreased by cyanide and, during tonic contraction, cyanide reduced force without changing [Ca2+]i implying metabolic sensitivity of both membrane excitation and [Ca2+]i - activation of the contractile proteins. READ MORE
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5. Calcium channel activity and force regulation in smooth muscle: Effects of polyamines and growth stimulation
Abstract : The initial signal for contraction in smooth muscle is an increase in [Ca2+]i. Ca2+ ions can either enter the cytosol from the extracellular medium or be released from intracellular stores. Voltage-operated Ca2+ channels (VOC) play a dominant role in the activation of smooth muscle contraction. READ MORE