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Motor and inflammatory effect of hyperosmolar solutions on the rat urinary bladder in relation to capsaicin-sensitive sensory nerves. 1990

C A Maggi, and L Abelli, and S Giuliani, and V Somma, and M Furio, and R Patacchini, and A Meli
Pharmacology Department, A. Menarini Pharmaceuticals, Florence, Italy.

1. Intravesical administration of hyperosmolar NaCl or urea solutions produced a concentration-dependent stimulatory action on the micturition reflex in urethane-anesthetized rats. This effect was not modified in rats pretreated with capsaicin as adults (50 mg/kg s.c. 4 days before). 2. Hyperosmolar NaCl also produced Evans blue leakage (plasma extravasation) in the rat bladder. This effect was greatly reduced by extrinsic bladder denervation and in rats desensitized to capsaicin as newborns but not as adults. 3. Cumulative addition of NaCl produced a concentration-dependent increase in tone and biphasic effects on neurogenic contractions of the rat isolated bladder. These effects were not modified by in vitro capsaicin desensitization. 4. These findings do not support the idea that true osmoreceptors are present in the rat urinary bladder. The neurogenic component of the inflammatory response to hyperosmolar NaCl could involve activation of a subpopulation of bladder sensory fibers susceptible to the neurotoxic action of capsaicin in the early postnatal period only.

UI MeSH Term Description Entries
D006982 Hypertonic Solutions Solutions that have a greater osmotic pressure than a reference solution such as blood, plasma, or interstitial fluid. Hypertonic Solution,Solution, Hypertonic,Solutions, Hypertonic
D007249 Inflammation A pathological process characterized by injury or destruction of tissues caused by a variety of cytologic and chemical reactions. It is usually manifested by typical signs of pain, heat, redness, swelling, and loss of function. Innate Inflammatory Response,Inflammations,Inflammatory Response, Innate,Innate Inflammatory Responses
D008297 Male Males
D009119 Muscle Contraction A process leading to shortening and/or development of tension in muscle tissue. Muscle contraction occurs by a sliding filament mechanism whereby actin filaments slide inward among the myosin filaments. Inotropism,Muscular Contraction,Contraction, Muscle,Contraction, Muscular,Contractions, Muscle,Contractions, Muscular,Inotropisms,Muscle Contractions,Muscular Contractions
D009121 Muscle Denervation The resection or removal of the innervation of a muscle or muscle tissue. Denervation, Muscle,Denervations, Muscle,Muscle Denervations
D009130 Muscle, Smooth Unstriated and unstriped muscle, one of the muscles of the internal organs, blood vessels, hair follicles, etc. Contractile elements are elongated, usually spindle-shaped cells with centrally located nuclei. Smooth muscle fibers are bound together into sheets or bundles by reticular fibers and frequently elastic nets are also abundant. (From Stedman, 25th ed) Muscle, Involuntary,Smooth Muscle,Involuntary Muscle,Involuntary Muscles,Muscles, Involuntary,Muscles, Smooth,Smooth Muscles
D009475 Neurons, Afferent Neurons which conduct NERVE IMPULSES to the CENTRAL NERVOUS SYSTEM. Afferent Neurons,Afferent Neuron,Neuron, Afferent
D009994 Osmolar Concentration The concentration of osmotically active particles in solution expressed in terms of osmoles of solute per liter of solution. Osmolality is expressed in terms of osmoles of solute per kilogram of solvent. Ionic Strength,Osmolality,Osmolarity,Concentration, Osmolar,Concentrations, Osmolar,Ionic Strengths,Osmolalities,Osmolar Concentrations,Osmolarities,Strength, Ionic,Strengths, Ionic
D011919 Rats, Inbred Strains Genetically identical individuals developed from brother and sister matings which have been carried out for twenty or more generations or by parent x offspring matings carried out with certain restrictions. This also includes animals with a long history of closed colony breeding. August Rats,Inbred Rat Strains,Inbred Strain of Rat,Inbred Strain of Rats,Inbred Strains of Rats,Rat, Inbred Strain,August Rat,Inbred Rat Strain,Inbred Strain Rat,Inbred Strain Rats,Inbred Strains Rat,Inbred Strains Rats,Rat Inbred Strain,Rat Inbred Strains,Rat Strain, Inbred,Rat Strains, Inbred,Rat, August,Rat, Inbred Strains,Rats Inbred Strain,Rats Inbred Strains,Rats, August,Rats, Inbred Strain,Strain Rat, Inbred,Strain Rats, Inbred,Strain, Inbred Rat,Strains, Inbred Rat
D001743 Urinary Bladder A musculomembranous sac along the URINARY TRACT. URINE flows from the KIDNEYS into the bladder via the ureters (URETER), and is held there until URINATION. Bladder,Bladder Detrusor Muscle,Detrusor Urinae,Bladder Detrusor Muscles,Bladder, Urinary,Detrusor Muscle, Bladder,Detrusor Muscles, Bladder

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