[The effect of changes in the intraoral environment on the state of the periodontium in rats. I. Loss of salivation and increased salivation].
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Animals↗
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Antagonism of conditioned salivation in conscious dogs by antihypertensive drugs.
Methyldopate (methyldopa (ethyl ester)), carbidopa, clonidine, and ST-91 were evaluated for their effects on conditioned salivation in unanesthetized dogs. Clonidine produced dose-dependent inhibition of salivation 20 min after an intravenous injection. At equivalent and larger doses, ST-91, a clonidine analog which does not penetrate the blood-brain barrier, was ineffective in inhibiting conditioned salivation, suggesting that central rather than peripheral mechanisms are involved in clonidine-induced inhibition of salivation. Methyldopate also produced a dose-dependent inhibition of salivation in dogs. The mechanism involved in methyldopa-induced inhibition of salivation may involve both central and peripheral mechanisms because carbidopa, an inhibitor (like methyldopa) of peripheral aromatic decarboxylase (EC 4.1.1.28), significantly inhibited salivation.
Animals↗
Salivation discordant with hunger.
In the present study, the authors tested whether an increase in salivation is associated with an increase in subjectively experienced hunger. After conditioning, subjects showed a significant increase in salivation flow. Hunger levels, however, were significantly decreased after conditioning. No correlation was found between salivation flow and hunger levels. It is argued that salivation responses and subjectively experienced hunger are loosely coupled systems. Salivation flow reflects the learning history of a subject which may sometimes be paralleled by a biological state which is called hunger, whereas, at other times, hunger may be absent. The authors conclude that conditioning of preparatory responses such as salivation depends on the probability relationship between exposure to cues (CSs) and food intake (US), as well as the intensity of the US.
Adult↗
The mechanism of the clonidine-induced reduction in peripheral parasympathetic submaxillary salivation.
The mechanism of the clonidine induced reduction in submaxillary salivation evoked by electrical stimulation of the chorda tympani was investigated in anaesthetised cats. This effect of clonidine was found to be dose and frequency dependent. In addition to clonidine, tramazoline, also a preferential presynaptic alpha-adrenoceptor agonist, produced a reduction in electricallly evoked salivation. Methoxamine, noradrenaline and naphazoline, which are less potent presynaptic alpha-receptor agonists, caused increases in salivation. Phentolamine only partially antagonized the decrease in salivation produced by clonidine whereas it was virtually abolished by yohimbine. Clonidine increased salivation evoked by intra-arterial injections of carbachol. These findings suggest that clonidine reduces peripheral parasympathetically evoked submaxillary salivation by activation of presynaptic alpha-adrenoceptors which inhibit cholinergic transmission.
Adrenergic alpha-Agonists↗
Effect of food change on consumption, hedonics, and salivation.
This study assessed the influence of introducing a new food after repeated presentations of one food on food consumption, hedonics, and salivation. Male subjects were provided repeated 150-calorie courses of pizza or cheeseburger until satiety. Hedonics and salivation were measured before each course. Subject were then provided an additional 450 calorie course of the same or the new food. During the development of satiety, subjects showed reliable increases in fullness and decreases in hunger and hedonics. Salivation briefly increased to maximal salivation, followed by reliable decreases. No differences in pattern of change for fullness, hunger, hedonics or salivation were noted across foods. Presentation of the new food resulted in significantly greater caloric consumption than another serving of the same food (130 vs. 44.5 kcal), an increase in hedonics and salivation relative to presentation of the same food, with no influence on hunger or fullness. These results suggest that after satiety develops, response recovery for subjective, physiological, and behavioral components of eating can be observed when new, palatable foods are presented.
Adolescent↗
The effect of clonidine on centrally and peripherally evoked submaxillary salivation.
In anaesthetised cats, clonidine (10 microgram/kg, i.v.) produced a 60% reduction in submaxillary salivation induced by brain stem stimulation at 10 and 15 Hz and reductions of 35 and 15% in salivation evoked by chorda tympani nerve stimulation at 5 and 15 Hz respectively. Pretreatment with clonidine (20 microgram/kg/day, orally) for 28 days reduced peripherally evoked salivation by 45%. These results suggest that both central and peripheral mechanisms are involved in the diminished salivation produced by clonidine, and the reduction on peripheral stimulation may reflect the presence of presynaptic alpha-adrenoceptors inhibiting cholinergic transmission.
Animals↗
Action of clonidine on centrally evoked salivation in anaesthetized cats.
1. Clonidine (4 microgram/kg) given intracisternally to anaesthetized cats inhibited brain stem-evoked parasympathetic submaxillary or parotid salivation by 62% at 5 Hz and 44% at 15 Hz. 2. The inhibitory action of clonidine on salivation was equally prevented by pretreatment with either intracisternal yohimbine (175 microgram/kg) or phentolamine (250 microgram/kg), used as preferential pre- and post-synaptic alpha-adrenoreceptor-blocking drugs respectively. 3. the inhibition of centrally evoked salivation by clonidine is due to an action on alpha-adrenoreceptors but no clear evidence was obtained to indicate whether these were located pre- or post-synaptically. This is in contrast to the preferential presynaptic action of clonidine in reducing peripheral parasympathetic nerve-evoked salivation.
Animals↗
Studies on tachykinin (neurokinin) receptor coupled with inositol phospholipid hydrolysis and salivation in rat salivary glands.
3H-substance P binding to the membranes of rat salivary glands was studied. The Kd and Bmax values were found to be 0.34 nM and 141 fmole/mg protein respectively using established natural occurring tachykinins to displace the binding. The rank order of potency was identified as substance P > neurokinin A > neurokinin B. These natural occurring tachykinins stimulate inositol phospholipid hydrolysis in slices of rat salivary glands, and the rank order of potency was also substance P > neurokinin A > neurokinin B. When salivation was induced by natural occurring tachykinins and acetylcholine (via i.v. route) in anesthetized rats with doses eliciting equivalent salivating responses, atropine blocks acetylcholine- as well as neurokinin B-, but not substance P- or neurokinin A-induced salivation. Based on the results mentioned above, we make a tentative conclusion that multiple receptor subtypes of neurokinins may exist in rat salivary glands. The neurokinins B receptor subtype is likely located presynaptically in the cholinergic nerve endings, whereas substance P and/or neurokinin A receptor subtypes may exist in the glandular tissue. The salivation induced by these neurokinins is likely through the activation of receptors, which are coupled to phosphatidylinositol turnover pathway.
Acetylcholine↗
Short-term effects of energy density on salivation, hunger and appetite in obese subjects.
Obese patients were admitted to a metabolic unit for weight loss. On two paired-test days subjects were given disguised preloads of 100 kcal (0.42MJ) or 300 kcal (1.26MJ). When presented with a meal one hour after the preload, subjects salivated more and reported more hunger, but not appetite, after the low compared to the high preload. A different group of 14 subjects were given preloads of the same energy content (200 kcal, 0.84MJ) on paired-test days. On one day they took 1 g methyl cellulose with 100 ml water drink immediately before the preload. Neither the energy-dilution effect of the water, nor the effect of the methyl cellulose caused a significant decrease in salivation, hunger or appetite scores one hour after the preloads of equal energy content. These results show that salivation and hunger are inversely related to short-term changes in energy intake in obese subjects. Alterations in energy density without changing energy intake or the ingestion of methyl cellulose have no effect on salivation, hunger or appetite.
Adolescent↗
Food-reinforced inhibition of conditioned salivation in dogs.
Twelve dogs salivated to a tone that was followed by food, but not to a noise for which there was an added response dependency. The noise was followed by food if and only if they did not salivate. The addition of this response dependency vitiated the classically conditioned response to the noise. A yoked-control group of 6 dogs receiving the same sequences of stimuli and food salivated to both the tone and noise stimuli.
Acoustic Stimulation↗
Influence of food on the effect of propantheline and L-hyoscyamine on salivation.
The absorption of a quartenary (propantheline, 30 mg) and a tetiary (1-hyoscyamine, 0.8 mg) anticholinergic compound was studied in 8 healthy volunteers by measuring the effects on salivation. Both compounds were administered as rapidly disintegrating tablets, 1-hyoscyamine also in a slow-release formulation (Egazil Durules). The three preparations and placebo were administered under fasting conditions and with a standardized light meal using a randomized cross-over design. Salivation measurement were performed with a citric acid stimulation method every hour for 10 hours. In the fasting patient, all three anticholinergic test preparations decreased the salivation significantly. When taken with food, the effect of propantheline was almost abolished, while the effects of the 1-hyoscyamine preparations were uninfluenced. It was concluded that the clinical effects of proprantheline might be extremely varying depending how the drug is taken in relation to meals. In contrast the clinical effects of 1-hyoscyamine seem to be independent of food intake.
Adolescent↗
[Conidioned reflex and polarization salivation].
The paper outlines some characteristics of salivation arising under the action of DC anode on the parietal areas of the dog's head. It is suggested that peculiarities and characteristics of salivation induced by a DC anode coincide with those described with regard to conditioned salivation.
Animals↗
[Vegetative parameters under the effect of ouabain (g-strophanthin) in endogenous depressive patients. 1. The salivation rate].
In 7 healthy test persons and in 17 endogenous depressive patients the salivations rate was measured in a survey investigation with the SHP-test. The salivation rate of healthy test persons is constant. In endogenous depressive patients it develops a diminishing of depression depth under treatment with Ouabain (g-Strophanthin) between the 6th and the 12th day which is connected with reduction of the drive diminishing and the restauration of mood. The effective salivation rate is gaining. Possible principles of the influence of Ouabain are discussed.
Depression↗
Substance P stimulation of amylase release by isolated parotid cells and inhibition of substance P induction of salivation by vasoactive peptides.
Substance P stimulation of salivation in rats has been studied as has its in vitro enhancement of amylase release by isolated parotid cells. The extent of the stimulation on amylase release by isolated parotid cells was dependent upon the concentration of substance P, with the minimum effective concentration being 1 nM. The substance P effect was detectable within 1 min after incubation and lasted for at least 50 min. Substance P stimulation was demonstrable at 25--37 degrees C but not at 0 degrees C. Adrenocorticotropic hormone (ACTH), thyrotropin-releasing hormone (TRH), vasopressin and neurotensin had no effect on amylase release. These results suggest that substance P may act directly on the parotid cells. Examination of the salivary-stimulating activity of fragments of substance P showed that the C-terminal octapeptide and (pyroglutamyl)hexapeptide were active, although less potent than substance P, whereas its free acid, C-terminal tetra- and tri-peptides were inactive. Vasopressin, angiotensin II and neurotensin could inhibit substance P induced salivation, whereas TRH, ACTH and somatostatin had no effect. Amylase activity per unit volume of saliva was not changed by the injection of vasopressin, angiotensin II or neurotensin. These vasoactive peptides did not affect substance P stimulation of amylase release by isolated parotid cells. The results indicate that vasopressin, angiotensin II and neurotensin inhibit the action of substance P on salivation at sites other than the parotid cells.
Acetylcholine↗
[Salivation test in patients with affective disorders treated with amitriptyline, mianserin and electroconvulsive therapy].
The aim of this work was assessment of the peripheral anticholinergic effects by use of a salivary test in patients with depression on the background of affective disease, treated over four weeks in a psychiatric department by one of three methods: amitriptyline, mianserin or nondominant unilateral electroconvulsive therapy (NDULECT). There were 22 patients treated with amitriptyline, 26 mianserin and 20 by NDULECT. The degree of depression was assessed by Hamilton's scale of depression and was similar in the groups of patients compared. Also the amount of saliva excreted was similar in the material examined before treatment. Among the methods of treatment the most severe inhibition of salivation was noted in the group treated with amitriptyline, the least--after NDULECT. Mianserin reduced salivation to a small degree--taking up a middle position in the comparison of methods of treatment. Practically speaking there is a conclusion: in patients whose somatic condition contraindicates, during treatment of endogenous depression, unwanted symptoms occurring after inhibition of the cholinergic receptor, the most acceptable of the three methods would be the use of mianserin or NDULECT.
Adult↗
[Atropine in the premedication of patients at risk. Its effect on hemodynamics and salivation during intubation anesthesia using succinylcholine].
Should atropine be administered for premedication? This question continues to be controversial; in particular, the combined administration of atropine and succinylcholine has been investigated with conflicting results by numerous researchers. The present study was carried out to assess the effect of premedication with atropine on hemodynamic variables and salivation in patients assigned to ASA class II and III. METHODS. Eighty ASA class II or III patients received pethidine 1.0 mg/kg and promethazine 0.5 mg/kg i.m. 30 min prior to induction of anesthesia and atropine, either 0.01 mg/kg i.v. 10 min or 0.01 mg/kg i.m. 30 min prior to a standardized anesthetic induction with alcuronium (precurarizing dose), thiopental, and succinylcholine. In the control groups (20 patients each), no atropine was given. Systolic, diastolic, and mean arterial pressures (MAP) were measured. The ECG was monitored for arrhythmias. Salivation was assessed semiquantitatively using swabs positioned within the pharyngeal space. RESULTS. Ten minutes after the administration of atropine i.v., a significant increase in heart rate (HR) was observed; this did not occur within 30 min after administration of atropine i.m. At the time of tracheal intubation, HR was significantly increased in both i.v. atropine risk groups. After atropine i.m., an increase in heart rate during intubation was observed in ASA class II patients only. No increase in heart rate occurred in the control groups during tracheal intubation. Neither i.m. nor i.v. atropine had any significant effect on blood pressure. Arrhythmias occurred in a few cases with both routes of administration; several instances of marked tachycardia were recorded.(ABSTRACT TRUNCATED AT 250 WORDS)
Adolescent↗
The central and peripheral effectiveness of two oxotremorine-antagonists determined using oxotremorine-induced tremor and salivation.
Two oxotremorine antagonists have been examined using oxotremorine as the tremor salivation inducer and the ratios between the central and peripheral nervous systems determined. Under these conditions these compounds are still more effective antagonists centrally than peripherally. Differences in distribution to the various muscarinic receptors involved is believed to be the major factor in determining this separation of central and peripheral activities.
Alkynes↗
Central connections of the salivation reflex in man.
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Adult↗