Our library of drug research abstracts drawn from the medical literature is updated on a regular schedule, and you can be assured that new doxycycline research articles will be listed here shortly after becoming available to us.
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Medical research on doxycycline
J Gastroenterol. 2008 Jun; 43(6): 429-433
Usta Y, Saltik-Temizel IN, Demir H, Uslu N, Ozen H, Gurakan F, Yuce A
BACKGROUND: Research regarding the optimal therapeutic approach to Helicobacter pylori infection in children is ongoing. There is no consensus as to duration of treatment or second-line therapy. The purpose of this study was compare the efficacy of 7-day and 14-day triple therapies and report the results of second-line quadruple therapy in children. METHODS: A total of 275 consecutive H. pylori-infected patients were enrolled into two groups. Group 1 (n = 180) received triple therapy with 14 days of amoxicillin and clarithromycin and 21 days of proton pump inhibitor. Group 2 (n = 95) received triple therapy including 7 days of amoxicillin and clarithromycin with 21 days of proton pump inhibitor. Subsequently, 89 patients not responding to the triple therapies received quadruple therapy comprising omeprazole (14 days), bismuth subcitrate (7 days), doxycycline (7 days), and metronidazole (7 days). Eradication was evaluated by (13)C-urea breath test. RESULTS: The per-protocol eradication rates in groups 1 and 2 were 60.5% and 55.8%, respectively (P = 0.44). In the second interview with 227 patients, severe symptoms were reported to have disappeared in 59% and decreased notably in 34.8%. Helicobacter pylori was eradicated in 66.7% of patients at the end of the quadruple therapy. In the third interview with 75 patients, severe symptoms had decreased in 38.6% and disappeared in 56%. CONCLUSIONS: The different duration of the two treatment regimens had no impact on eradication rates. Furthermore, quadruple therapy was necessary to achieve H. pylori eradication after triple therapy. However, the eradication rate with quadruple therapy was still insuf-ficient. Consequently, a new therapeutic approach to H. pylori infection in children is needed.
Dig Dis Sci. 2008 Jul 2;
Taghavi SA, Jafari A, Eshraghian A
This study compared a new regimen (group A: doxycycline, co-amoxiclav, omeprazole) and two routinely prescribed regimens (group B: amoxicillin, omeprazole, furazolidone, bismuth; group C: amoxicillin, clarithromycin, omeprazole) to find an acceptable first-line treatment option for Helicobacter pylori. The study population consisted of 189 patients who referred to our clinic to undergo endoscopy due to ulcer-like dyspepsia. The H. pylori eradication rate was 68% in group A, 56% in group B, and 70% in group C according to per-control analysis. There was no statistically significant difference in H. pylori eradication between groups A and B (P = 0.187), groups A and C (P = 0.857), and groups B and C (P = 0.15). In conclusion, although none of the three eradication regimens can be recommended as a first-line eradication treatment, the new regimen is at least as effective and probably better tolerated than the two routinely applied regimens.
A drug-inducible transgenic system for direct reprogramming of multiple somatic cell types.
Nat Biotechnol. 2008 Jul 1;
Wernig M, Lengner CJ, Hanna J, Lodato MA, Steine E, Foreman R, Staerk J, Markoulaki S, Jaenisch R
The study of induced pluripotency is complicated by the need for infection with high-titer retroviral vectors, which results in genetically heterogeneous cell populations. We generated genetically homogeneous 'secondary' somatic cells that carry the reprogramming factors as defined doxycycline (dox)-inducible transgenes. These cells were produced by infecting fibroblasts with dox-inducible lentiviruses, reprogramming by dox addition, selecting induced pluripotent stem cells and producing chimeric mice. Cells derived from these chimeras reprogram upon dox exposure without the need for viral infection with efficiencies 25- to 50-fold greater than those observed using direct infection and drug selection for pluripotency marker reactivation. We demonstrate that (i) various induction levels of the reprogramming factors can induce pluripotency, (ii) the duration of transgene activity directly correlates with reprogramming efficiency, (iii) cells from many somatic tissues can be reprogrammed and (iv) different cell types require different induction levels. This system facilitates the characterization of reprogramming and provides a tool for genetic or chemical screens to enhance reprogramming.
The disease modifying osteoarthritis drug (DMOAD): Is it in the horizon?
Pharmacol Res. 2008 Jun 8;
Qvist P, Bay-Jensen AC, Christiansen C, Dam EB, Pastoureau P, Karsdal MA
Till date, the pharmaceutical industry has failed to bring effective and safe disease modifying osteoarthritic drugs (DMOADs) to the millions of patients suffering from this serious and deliberating disease. We provide a review of recent data reported on the investigation of DMOADs in clinical trials, including compounds inhibiting matrix-metalloproteinases (MMPs), bisphosphonates, cytokine blockers, calcitonin, inhibitors of inducible nitric oxide synthase (iNOS), doxycycline, glucosamine, and diacereine. We discuss the challenges associated with the drug development process in general and with DMOADs in particular, and we advance the need for a new development paradigm for DMOADs. Two central elements in this paradigm are a stronger focus on the biology of the joint and the application of new and more sensitive biomarkers allowing redesign of clinical trials in osteoarthritis.
Ned Tijdschr Geneeskd. 2008 May 31; 152(22): 1271-5
Kertzman MG, Smeets JG, Boukes FS, Goudswaard AN
The 1999 practice guideline 'Acne vulgaris' from the Dutch College of General Practitioners has been revised. Benzoyl peroxide and local retinoids are first choice in local treatment of acne. When treatment with oral antibiotics is indicated, doxycycline is first choice. Use of minocycline is not recommended in general practice. It is recommended that both local and oral antibiotics are always combined with local benzoyl peroxide or a local retinoid. Oral contraceptives are only recommended in women with acne who also desire contraception. Use of oral contraceptives containing cyproterone acetate is no longer recommended in women with acne, because they are not more effective than other oral contraceptives. Treatment with oral isotretinoin may be given by the general practitioner, as long as the treatment guidelines are carefully followed.
Comp Med. 2008 Jun; 58(3): 276-81
Zhou X, Bao H, Al-Hashem R, Ji H, Albert M, Wong KK, Sun Y
Mutational activation of the gene for epidermal growth factor receptor (EGFR) is 1 of the main ways by which this receptor induces non-small cell lung cancers (NSCLC). Variant III EGFR (EGFRvIII) is a potential therapeutic target in NSCLC treatment because of the high frequency of deletion mutations in this protein. This study used noninvasive magnetic resonance imaging (MRI) to investigate the role of an EGFRvIII mutant in lung tumorigenesis and tumor maintenance as well as its response to the EGFR small molecule inhibitor erlotinib (Tarceva) on bitransgenic mice. Both spin-echo and gradient-echo sequences with and without cardiac and respiratory gating were performed to image the invasive mouse lung tumor driven by EGFRvIII mutation. Tumor volumes were measured based on 2-dimensional axial MRI; 3-dimensional rendering of the images were obtained to demonstrate the spatial location and distribution of the tumor in the lung. The MRI results indicated that the tumor driven by the EGFRvIII mutation was generated and maintained in the bitransgenic mice with the use of doxycycline. Tumor monitoring via MRI showed that Erlotinib can significantly inhibit the growth of tumor in vivo. MRI has the ability to image mouse lung tumor with different sequences focusing on tissue contrasts between tumor and surroundings. The MRI approaches in this work can be applied on other antitumor drug treatment evaluation in vivo when appropriate sequences are chosen.
[Analysis of antibiotic susceptibility of foodborne Listeria monocytogenes in China]
Wei Sheng Yan Jiu. 2008 Mar; 37(2): 183-6
Yang Y, Fu P, Guo Y, Liu X
OBJECTIVE: To study the antibiotic susceptibility of foodborne Listeria monocytogenes in China. METHODS: The susceptibilities of 476 strains of foodborne Listeria monocytogenes to antibiotics were determined in Broth Microdilution Susceptibility Testing in Clinical and Laboratory Standards Institute. The antibiotics of gentamicin, ampicillin, penicillin, tetracycline, doxycycline, imipenem, erythromycin, ciprofloxacin, levofloxacin, cephalothin, rifampin, vancomycin, chloramphenicol, Trimethoprim-sulfamethoxazole, ampicillin-sulbactam were used. RESULTS: The rates of antibiotic resistance in 467 is olates were 4.5%. Tetracycline resistance was most prevalent, accouting for 4.07% . The foods that the rates of antibiotic resistance were highest were vegetable (10%). Among 14 provinces, Jilin, Hubei and Hebei were the third top, the rate of which were 19.6% and 9.1% and 8%, respectively. CONCLUSION: It was suggested that antibiotic resistance exists in foodborne Listeria monocytogenes to a certain extent in China. It should pay more attention to the use of drugs in prevention and clinic treatment to reduce the antibiotic resistant strains.
The role of gamma-synuclein in cocaine-induced behaviour in rats.
Eur J Neurosci. 2008 Jun; 27(11): 2938-51
Boyer F, Dreyer JL
The aim of this study was to investigate the role of gamma-synuclein in the rewarding effects of chronic cocaine administration and its putative interaction with the dopamine transporter (DAT). For this purpose, regulatable lentiviruses driving overexpression of the rat gamma-synuclein or DAT have been prepared, as well as lentiviruses expressing siRNAs, aimed at silencing either DAT or gamma-synuclein mRNA expression. Overexpression of DAT in the nucleus accumbens (NAc) induced a 35% decrease in locomotor activity, which could be abolished when the same animal was fed doxycycline. Furthermore, local inhibition of DAT in the NAc, using lentiviruses expressing siRNAs targeted against DAT, resulted in significant hyperlocomotion activity (72% increase over controls). By contrast, overexpression of gamma-synuclein in the NAc alone had no effect, while local silencing lead to a significant decrease in cocaine-induced locomotor activity (47% decrease compared with controls). Surprisingly, coinjection lentiviruses expressing DAT and gamma-synuclein - leading to overexpression of both proteins in the NAc - resulted in a strong increase in cocaine-induced rat locomotor activity (52% increase compared with controls), which was abolished upon locally silencing these genes, suggesting a synergetic role of both proteins, possibly mediated through a direct interaction.
Antibiotic options for treating community-acquired MRSA.
Expert Rev Anti Infect Ther. 2008 Jun; 6(3): 299-307
Powell JP, Wenzel RP
Community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) infections are developing as a prominent public-health threat. While minor CA-MRSA infections are treatable in an out-patient setting, the pharmacotherapeutic options for oral therapies are dwindling as resistance continues to rise in general and levels of susceptibility vary geographically. In many instances, fluoroquinolones and clindamycin are not reasonable empiric treatment choices, leaving physicians with trimethoprim-sulfamethoxazole, doxycycline or linezolid as viable options, depending on patient-specific circumstances and the impact of potential adverse effects. Resistance to intravenous options remains low and attention should be focused on the site and severity of infection when choosing antibiotic/intravenous immunoglobulin treatment. Clinical trials directly comparing antibiotic options in both out-patient and in-patient settings are needed to enhance recommendations for empiric therapy algorithms.
Talanta. 2008 Jun 15; 75(5): 1245-52
Li J, Chen L, Wang X, Jin H, Ding L, Zhang K, Zhang H
An automated system using on-line solid-phase extraction (SPE) high-performance liquid chromatography (HPLC) with ultraviolet (UV) detection was developed for the determination of tetracyclines (TCs), such as tetracycline (TC), oxytetracycline (OTC), chlortetracycline (CTC), metacycline (MC), and doxycycline (DC) in honey. One milliliter diluted honey sample was injected into a conditioned C18 SPE column and the matrix was washed out with water for 3 min. By rotation of the switching valve, TCs were eluted and transferred to the analytical column by the chromatographic mobile phase. Chromatographic conditions were optimized. TCs were separated in less than 8 min with a gradient elution using a mixture of 0.8% formic acid and acetonitrile. The UV detection was performed at 365 nm. The conditions for on-line SPE, including solvent and total time for loading sample and washing matrix were also optimized. Time for extraction and separation decreased greatly. For the five kinds of TCs, the limits of detection (LODs) at a signal-to-noise of 3 ranged from 5 to 12 ng g(-1). The relative standard deviations (R.S.D.) for the determination of TCs ranged from 3.4 to 7.1% within a day and ranged from 3.2 to 8.9% in 3 days, respectively.