Mean differences are given with 95% confidence intervals (95% CI). In summer 1848 this parliament passed a wide-ranging series of laws providing for abolition of most the older restrictions on landowning . In vitro theophylline inhibits IL-2 synthesis in human T-lymphocytes, an effect that is secondary to a rise in intracellular cyclic AMP concentration [78]. Chronic enzyme inhibition can lead to enzyme induction [7] and enhanced phosphodiesterase activity and reduced cellular cAMP levels were seen following withdrawal of phosphodiesterase inhibitors in a human monocyte cell line [8]. Increased reactive oxygen species and nitric oxide from increased expression of inducible nitric oxide synthase results in the formation of peroxynitrite radicals. This effect has not been observed by all investigators but there are doubts about the relevance of these observations to the clinical benefit provided by theophylline [88]. This would mean that theophylline might have a greater inhibitory effect on PDE in asthmatic airways than in normal airways. Jaffar Z.H., Sullivan P., Page C., Costello J. Low-dose theophylline modulates T-lymphocyte activation in allergen-challenged asthmatics. Bronchodilators are medicines that relax the muscles in the bronchial tubes (air passages) of the lungs. Thus, if a patient on maintenance theophylline requires a course of erythromycin, the dose of theophylline should be halved. Theophylline is a weak non-selective inhibitor of PDEs, which break down cyclic nucleotides in the cell, thereby leading to an increase in intracellular cyclic 3'5' adenosine monophosphate (AMP) and cyclic 3',5' guanosine monophosphate (GMP) concentrations (Figure 1). Differential effects on lipid kinase and protein kinase activities. Estenne M., Yernault J., De Troyer A. Effects of theophylline on human eosinophil functions: Comparative study with neutrophil functions. If this occurred following regular theophylline treatment a transient increase in intracellular cAMP degradation with a rebound deterioration in lung function would be expected following drug withdrawal. Yasui K., Hu B., Nakazawa T., Agematsu K., Komiyama A. Theophylline accelerates human granulocyte apoptosis not. Taylor D.R., Ruffin D., Kinney C.D., McDevitt D.G. As slow-release theophylline preparations are cheaper than long-acting inhaled 2-agonists and leukotriene modifiers, this may justify the choice of low dose theophylline as the add-on therapy for asthma control. Time course of change in bronchial reactivity with an inhaled corticosteroid in asthma. Yukawa T., Kroegel C., Dent G., Chanez P., Ukena D., Barnes P.J. FOIA Theophylline is structurally classified as a methylxanthine. Rabe K.F., Magnussen H., Dent G. Theophylline and selective PDE inhibitors as bronchodilators and smooth muscle relaxants. The bronchodilator effect of theophylline is reduced in human airways by the toxin charybdotoxin, which inhibits large conductance Ca2+-activated K+ channels (maxi-K channels), suggesting that theophylline opens maxi K channels via an increase in cyclic AMP [48]. Expression of heme oxygenase isoenzymes 1 and 2 in normal and asthmatic airways. It is well tolerated when given twice daily by mouth. Accessibility Was 21.99. The bronchoconstrictor effect of adenosine is prevented by therapeutic concentrations of theophylline [18]; however, this only confirms that theophylline is capable of antagonizing the effects of adenosine at therapeutic concentrations, and does not necessarily indicate that this is important for its anti-asthma effect. Common side effects of theophylline may include: nausea, vomiting, diarrhea; headache; sleep problems ( insomnia ); tremors; sweating; or. Cartier A., Lemire I., L'Archeveque J. Theophylline partially inhibits bronchoconstriction caused by inhaled histamine in subjects with asthma. Inclusion in an NLM database does not imply endorsement of, or agreement with, Doxofylline (7-(1,3-dioxalan-2-yl-methyl) theophylline) has similar efficacy to theophylline but has less effect on adenosine receptors so fewer cardiovascular and central side effects [5]. The https:// ensures that you are connecting to the Kelloway J.S., Wyatt R.A., Adlis S.A. Shohat B., Volovitz B., Varsano I. Mitenko P.A., Ogilvie R.I. There is convincing in vitro evidence that theophylline relaxes airway smooth muscle by inhibition of PDE activity, but relatively high concentrations are needed for maximal relaxation [7]. Cushley M.J., Tattersfield A.E., Holgate S.T. Epub 2008 Mar 13. In vivo intravenous aminophylline has an acute bronchodilator effect in asthmatic patients, which is most likely to be due to a relaxant effect on airway smooth muscle [50]. Nicholson C.D., Challiss R.A.J., Shahid M. Differential modulation of tissue function and therapeutic potential of selective inhibitors of cyclic nucleotide phosphodiesterase isoenzymes. Ichiyama T., Hasegawa S., Matsubara T., Hayashi T., Furukawa S. Theophylline inhibits NF-kB activation and IkBa degradation in human pulmonary epithelial cells. Bethesda, MD 20894, Web Policies There is no evidence that airway smooth muscle or inflammatory cells concentrate theophylline to achieve higher intracellular than circulating concentrations. Are methylxanthines obsolete? Hew M., Bhavsar P., Torrego A., Meah S., Khorasani N., Barnes P.J., Adcock I., Chung K.F. Withdrawal syndrome after the double-blind cessation of caffeine consumption. Drug dosage was then adjusted by an independent investigator using a computer programme (Pharmacy Department, City Hospital, Nottingham) to maintain theophylline levels in the therapeutic range (1020 mg l1). Since the improvement in lung function was relatively slow, this suggests that the effect of the added theophylline may be having an anti-inflammatory rather than a bronchodilator effect, particularly as the plasma concentration of theophylline in these studies was < 10 mg/L. These effects are seen even in patients treated with high doses of inhaled corticosteroids, indicating that the molecular effects of theophylline are likely to be different from those of corticosteroids. Many salts of theophylline have also been marketed, the most common being aminophylline, the ethylene diamine salt used to increase solubility at neutral pH, so that intravenous administration is possible. Smaller Hanse models are now built with single skin (monolithic skin), the 418 is the first with a sandwich-hull but the new 458 comes with a single skin hull and only bigger boats have a sandwich-hull. This effect is not mediated via PDE inhibition, but in neutrophils may be mediated by antagonism of adenosine A2A-receptors [31]. Theophylline is an activator of HDACs and enhances the anti-inflammatory effect of corticosteroids, as well as reversing steroid resistance in cells from COPD patients [39,40] (Figure 2). Even after discontinuation of testosterone . Investigation of diurnal changes in the disposition of theophylline. Withdrawal of theophylline therapy resulted in significant (p<0.05) deterioration in lung function, exercise performance, and two indices of overall dyspnea, and a significant increase in scoring of symptoms and auscultation findings. This suggests that there may be a group of severe asthmatic patients who particularly benefit from theophylline. FEV1 and PD20 histamine were measured before and 8 h after the first dose of treatment and 8, 32 and 56 h after the final dose. It is now apparent that non-bronchodilator effects of theophylline may be seen at plasma concentrations of <10 mg/L and that clinical benefit may be derived from these lower concentrations of theophylline. The bronchodilator effect of theophylline in chronic asthma is small in comparison with 2-agonists, however. Several deaths have been reported after intravenous aminophylline. Intramuscular injections of theophylline are very painful and should never be given. Theophylline appears to have an effect that is different from those of corticosteroids and it may therefore be a useful drug to combine with low dose inhaled steroids. A randomized, controlled trial of theophylline in patients with severe chronic obstructive pulmonary disease. Naclerio R.M., Bartenfelder D., Proud D., Togias A.G., Meyers D.A., Kagey Sobotka A., Norman P.S., Lichtenstein L.M. Bookshelf Erjefalt I., Persson C.G.A. Angina may be provoked by an activity or exercise or any other physical or mental stress that increases the heart's demand for blood. UK. This is not a complete list of side effects and others may occur. Introduction. Reduced clearance is found in liver disease, pneumonia and heart failure and doses need to be reduced to half and plasma levels monitored carefully. Theophylline (3-methyxanthine) has been used to treat airway diseases for over 70 years. Plasma theophylline levels during treatment with placebo and 32 h after the last dose of active drug were all <1.0 mg l1. 2005;18(2):103-8. doi: 10.1016/j.pupt.2004.10.006. Direct effects of caffeine and theophylline on p110 delta and other phosphoinositide 3-kinases. Since patients with severe asthma may have increased neutrophils in the airways [73,74], this may provide a mechanism whereby theophylline is effective as an add-on therapy to high doses of inhaled corticosteroids in these patients. Inhaled salmeterol or oral theophylline in nocturnal asthma? Accessibility Before This molecular mechanism is defective in COPD patients as HDAC2 activity and expression is markedly reduced, thus accounting for the steroid resistance of COPD [36]. The reason why theophylline selectivey activates HDAC activity is through the inhibition of PI3K-, which is activated by oxidative stress and involved in the regulation of HDAC2 activity [28]. Write a review. Peroxynitrite is increased in COPD lungs [42,43] and is associated with tyrosine nitration and inactivation of HDAC2 [44]. It was originally used as a bronchodilator but the relatively high doses required are associated with frequent side effects, so its use declined as inhaled 2-agonists became more widely used. There is also a defect in HDAC2 function in patients with severe asthma and in asthmatic patients who smoke [37,38]. The role of theophylline in severe asthma. In an uncontrolled study a group of adolescent patients with severe asthma who were controlled with oral and inhaled steroids, nebulized 2-agonists, inhaled anticholinergics and sodium cromoglycate, in addition to regular oral theophylline, withdrawal of the oral theophylline resulted in a marked deterioration of asthma control which could not be controlled by further increase in steroids and only responded to reintroduction of theophylline [101]. Although theophylline has been in clinical use for more than 70 years, its mechanism of action at a molecular level and its site of action remain uncertain, although there have been important recent advances. PD20 FEV1 was calculated by linear interpolation of the last two readings on the log dose-response plot. To determine the value of theophylline in the maintenance therapy of patients with severe chronic obstructive pulmonary disease (COPD), we conducted a trial of theophylline therapy withdrawal in 38 clinically stable patients with severe COPD (FEV1 < 60 percent) predicted. A comparison of low-dose inhaled budesonide plus theophylline and high-dose inhaled budesonide for moderate asthma. Low-dose theophylline reduces eosinophilic inflammation but not exhaled nitric oxide in mild asthma. government site. Nocturnal asthma: Slow-release terbutaline versus slow-release theophylline therapy. Culpitt S., Maziak W., Loukides S., Keller A., Barnes P.J. the contents by NLM or the National Institutes of Health. Addition of intravenous aminophylline to beta2-agonists in adults with acute asthma. Theophylline (3-methyxanthine) has been used to treat airway diseases for over 70 years. An official website of the United States government. Silverman K, Evans SM, Strain EC, Griffiths RR. The change in FEV1 8 h following the first and last dose of treatment did not differ significantly between theophylline and placebo. Theophylline may also benefit patients with COPD and increases exercise tolerance [110,111]. They relieve cough, wheezing, shortness of breath, and troubled breathing by increasing the flow of air through the bronchial tubes. This drug comes. Dubuis E, Wortley MA, Grace MS, Maher SA, Adcock JJ, Birrell MA, Belvisi MG. J Allergy Clin Immunol. Analysis of variance was used to determine period and order effects and to compare baseline values for FEV1, histamine and AMP PD20. Isolated bronchi from asthmatics are hyperresponsive to adenosine, which apparently acts indirectly by liberation of leukotrienes and histamine. Comparison of patients' compliance with prescribed oral and inhaled asthma medications. Adenosine antagonism is likely to account for some of the side effects of theophylline, such as central nervous system stimulation, cardiac arrhythmias (both via blockade of A1-receptors), gastric hypersecretion, gastroesophageal reflux and diuresis. Brenner M, Berkowitz R, Marshall N, Strunk RC. Characterization of the adenosine receptors in the airways. The introduction of long-acting inhaled 2-agonists has further threatened the position of theophylline, since the side effects of these agents may be less frequent that those associated with theophylline and long-acting inhaled 2-agonists are more effective controllers than theophylline [99]. and transmitted securely. 2018 May 2;27(148):180010. doi: 10.1183/16000617.0010-2018. For nocturnal asthma, a single dose of slow-release theophylline at night may be effective [91,92]. Several substituted derivatives have been synthesized, but none has any advantage over theophylline [2]. Background Pacemakers and theophylline are currently being used to relieve symptoms in patients with sick sinus syndrome (SSS). I would say that for most cruisers, considering a relatively small yacht, Bavaria's approach in what regards displacement makes sense, not to mention that . FOIA The drugs listed in Table III have either been documented not to interact with theophylline or do not produce a clinically significant interaction (i.e . Subjects crossed over to the second treatment period following a 2 week washout period. More recently it has been shown to have anti-inflammatory effects in asthma and COPD at lower concentrations. Mean (s.d.) Interestingly, there is a greater degree of improvement in forced vital capacity than in FEV1, possibly indicating an effect on peripheral airways. These concerns have lead to the view that intravenous aminophylline should be reserved for the few patients with acute severe asthma who fail to show a satisfactory response to nebulized 2-agonists. Disclaimer. Moxham J. Aminophylline and the respiratory muscles: An alternative view. government site. The dose of theophylline required to give therapeutic concentrations varies among patients, largely because of differences in clearance. Taylor D.R., Buick B., Kinney C., Lowry R.C., McDevitt D.G. Influence of cellular levels of cyclic AMP. Viral infections and vaccinations (immunizations) may also reduce clearance, and this may be particularly important in children. 3 Many older clinicians . Although theophylline has several actions recent work suggests that phosphodiesterase inhibition is important [5] and that phosphodiesterase activity is increased in asthmatic patients [6]. Anhydrous theophylline has the chemical name 1H-Purine- 2,6-dione, 3,7-dihydro-1 ,3 -dimethyl-, and is represented by the following structural formula: . Theophylline remains one of the most widely prescribed drugs for the treatment of asthma and COPD world-wide, since it is inexpensive and widely available. Ito K., Lim S., Caramori G., Cosio B., Chung K.F., Adcock I.M., Barnes P.J. Murahidy A., Ito M., Adcock I.M., Barnes P.J., Ito K. Reduction is histone deacetylase expression and activity in smoking asthmatics: A mechanism of steroid resistance. HHS Vulnerability Disclosure, Help This predicts that theophylline and corticosteroids may have a synergistic effect in repressing inflammatory gene expression. This process is reversed by the recruitment of histone deacetylases (HDAC) to the activated inflammatory gene promoter site within the nucleus. Thus total PDE activity in human lung extracts is inhibited by only 510% by therapeutic concentrations of theophylline [6]. The pulmonary disposition of theophylline and its influences on human alveolar macrophage bactericidal function. Federal government websites often end in .gov or .mil. The structural formula is: The effects of adenosine antagonists on human neutrophil function. Dose response relation to oral theophylline in severe chronic obstructive airway disease. Immunomodulation by theophylline in asthma. Immunomodulation by theophylline in asthma: Demonstration by withdrawal of therapy. However, in a clinical study theophylline failed to prevent the development of tolerance to the bronchoprotective effect of salmeterol in asthmatic patients [119]. Wilson A.J., Gibson P.G., Coughlan J. The demonstration that low doses of theophylline reduces neutrophils in induced sputum of patients with COPD suggests that theophylline may have some anti-inflammatory effect [71,113]. sharing sensitive information, make sure youre on a federal Introductory Offer: Save 10 percent on Cialis Together 4 pack - online only. This results in suppression of inflammatory genes and proteins, such as granulocyte-macrophage colony stimulating factor (GM-CSF) and interleukin-8 (IL-8) that have been switched on by proinflammatory transcription factors, such as nuclear factor-B (NF-B). Aubier M, Levy J, Clerici C, Neukirch F, Cabrieres F, Herman D. Protective effect of theophylline on bronchial hyperresponsiveness in patients with allergic rhinitis. PD20 AMP was measured before treatment and 9 h after the final dose. Phosphodiesterase 4 and tolerance to beta 2-adrenoceptor agonists in asthma. Withdrawal of theophylline therapy resulted in significant (p < 0.05) deterioration in lung function, exercise performance, and two indices of overall dyspnea, and a significant increase in scoring of symptoms and auscultation findings. UK. Minimum FEV1 values were significantly lower following withdrawal of theophylline compared with placebo (mean difference 0.15 [95% CI 0.03 to 0.26] l) (Table 2). Derivatives have been synthesized, but none has any advantage over theophylline [ 6 ] smoke 37,38! Of adenosine antagonists on human alveolar macrophage bactericidal function sensitive information, make sure youre on a federal Introductory:! The dose of active drug were all < 1.0 mg l1 than in FEV1 8 following. Measured before treatment and 9 h after the last two readings on the log dose-response.. ; 18 ( 2 ):103-8. doi: 10.1016/j.pupt.2004.10.006 asthma, a single theophylline discontinuation sublingual cialis... 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