AIM: To investigate the effect of flavone on oxidation-induced injury in retinal pigment epithelium(RPE) cells. METHODS: In in vivo studies, NaIO3-induced RPE degeneration in rat eyes were treated with 5g/L flavone eye drops 3 times a day for 1 week before and 4 weeks after NaIO3injection. At the end of 2 and 4 weeks, all rats were measured c-wave by electroretinogram(ERG). In in vitro studies,ARPE-19 cells were treated with hypoxia, H2O2, NaN3and t-BHP to induce cell damages. MTT assay was used to measure the viable cells. RESULTS: The ERG c-wave results showed that flavone reversed NaIO3-induced injury at the end of 4 weeks. In vitro results showed flavone reversed the various oxidants-induced injuries in RPE cells.CONCLUSION: Flavone could prevent the RPE from oxidation-induced injury both in vivo and in vitro.

AIM:To investigate the effect of flavone on ocular blood flow in rabbit eyes and the formation of choroidal neovascularization(CNV)in rat model of age-related macular degeneration(AMD).METHODS:In in vivo studies,colored microsphere technique was used to determine the ocular blood flow in ocular hypertensive rabbit eyes.The rat eyes were treated with 5g/L flavone eye drops 3 times a day for 1 week before and 4 weeks after laser-induced injury of Bruch's membrane.The development of CNV was determined by fluorescein angiography(FA)performed on weeks 2 and 4.In in vitro studies,the effect of flavone on the viability of HUVECs was measured by MTT assay.RESULTS:The ocular blood flow in rabbit eyes was significantly increased after flavone instillation.Flavone significantly inhibited the formation of laser induced CNV.In vitro resultsshowedthat fiavoneinhibited the proliferation of HUVECs.CONCLUSION:Flavone could increase ocular blood flow and inhibit the formation of CNV.

AIM: To study the effects of naringenin eye drops on NaIO3-induced retinal pigment epithelium (RPE) degeneration and laser-induced choroidal neovascularization (CNV) in rat eyes.METHODS: The 35mg/kg NaIO3-induced RPE degeneration was prevented by 10g/L naringenin eye drops 3 times a day for 7 days in advance of NaIO3 injection, and then 2 to 4 weeks thereafter, RPE function was measured with C-wave of electroretinogram (ERG). The laser-induced CNV rats were treated with laser to break the Bruchs membrane and the CNV formation was prevented by 10g/L naringenin eye drops instilled 3 times a day for 2 to 4 weeks. The CNV formation was measured with fluorescein angiography (FA) and flat mount. RESULTS: Two weeks after NaIO3 injection, the amplitude of ERG C-wave fell markedly in NaIO3 group to 53% of normal group (P<0.01). No apparent difference was observed in naringenin+ NaIO3 group. Four weeks later, the NaIO3 group fell to 37% of normal group (P<0.01), while the naringenin+ NaIO3 group fell to only 57% of normal group (P<0.01). There is a 52% reversal of the ERG C-wave by naringenin as compared to NaIO3 treated group (P<0.05). Two weeks and four weeks after laser treatment, naringenin reduced the CNV formation to 53% and 49% of control group (100%) measured by FA (P<0.01). Four weeks after laser treatment, naringenin reduced the CNV formation by 47% as compared to control group measured with flat mount (P<0.01).CONCLUSION: Naringenin significantly protected RPE from NaIO3 induced degeneration and can also prevent CNV formation.

OBJECTIVE: To better understand the characte ristics of the neurogenic motor evoked potential (NMEP) before and after acute s pinal cord injury. METHODS: We recorded and characterized the spinal cord NMEP fro m 48 normal rats and from 38 rats with spinal cord hemisection lesion. Spinal co rd NMEPs were elicited by applying a range of current intensities with bipolar m icroelectrode stimuli to the C4 cord segment and recording the responses from sc iatic nerves with bipolar microelectrodes placed in the neurilemma. RESULTS: The evoked potentials consisted of three stable and re producible negative and three positive peaks. The meanplus minusSD latencies of N1 were 2.89plus minus0.22 ms on the right side and 2.89plus minus0.24 ms on th e left side. The mean conduction velocity was 47.9 m/s. The meanplus minusSD am plitudes of N1 were 3.61plus minus2.10 muV on the right side and 3.83plus minus2.3 2 muV on the left side. The amplitudes of N1 were signific antly different among the eight stimulus intensity groups (right side: F=2.22, df=7201, P=0.03; left side: F=2.11, df=7206, P=0.04). The amplitude was largest when the stimulus intensity was 1.1-2.5 mA. The latencies of N1 were not si gnificantly different among the eight stimulus intensity groups (right side: F=0.40, df=7201, P=0.9; left side: F=1.20, df=7206, P=0.3. The amplitudes and latencies of N2, N3 were not significantly different among the eight stimulus intensity groups. There were no significant changes in latency and amplitude between the left and the right side nerve responses. Thirty-eight rats underwent T9 cord right side hemisection. Among them, 20 (53%), 30 (79%), and 32 (84%) rats could not be reco rded in corresponding to N1, N2, and N3, respectively, in the right-side sciati c nerves; and 13 (79%), 18 (47%), and 21 (55%), in corresponding to N1, N2, and N3 in the left-side sciatic nerves. The latency was significantly delayed on th e both right and left sides. The amplitude N1 was significantly depressed on the both sides, with N3 significantly depressed on the right side and N2 not signif icantly depressed. CONCLUSIONS: The amplitude of N is significantly different amon g the eight stimulus intensity groups. The amplitude is largest when the stimulu s intensity is 1.1-2.5 mA. The light injury results in a significant la tency delay in N1, N2, and N3 waves and a significant amplitude attenuation in N1. The N1 amplitude is sensitive to the degree of the lesion and conducts bilate rally. N2 and N3 conduct mainly along the ipsilateral posterolaterial tracts in the rats.

AIM: To study the effects of Tetramethylpyrazine (TMP) on retinal pigment epithelium (RPE) degeneration, choroidal blood flow and oxidative stress of RPE cells.METHODS: The 35mg/kg NaIO3-induced RPE degeneration rat eyes was given 25μg 1% TMP eye drops 3 times a day for 7 days before NaIO3 injection, and then 2 to 4 weeks after NaIO3 injection. RPE function was measured with c-wave of electroretinogram (ERG). Colored microsphere technique was used for in vivo experiments to determine the choroidal blood flow in ocular hypertensive (40mmHg) rabbit eyes. Methylthiazoltetrazolium (MTT) assay was used to study in vitro effect of TMP on various oxidants induced injury in the hRPE (ARPE-19 (ATCC, Manassas, VA, USA)) . RESULTS: Two weeks after NaIO3 injection, the amplitude of ERG c-wave fell markedly in NaIO3 group to 36% of control group (P<0.01). No apparent difference was observed in TMP+NaIO3 group. Four weeks later, the NaIO3 group fell to 46% of control group (P<0.01), while the TMP+NaIO3 group fell to only 77% of control group (P<0.01). There was a 67% reversal of the ERG c-wave by TMP as compared to NaIO3 group (P<0.01). The choroidal blood flow was significantly increased at all time points (at 30, 60 and 120 minutes after TMP instillation) as compared with corresponding controls. TMP had no effect on hypoxia-(1%O2), t-BHP- and H2O2-induced damage in RPE cells. 10μg/mL TMP could reverse 1 and 3mmol/L NaN3-induced loss of viability of RPE by 18.5% (P<0.01) and 23% (P<0.01), respectively. 30μg/mL TMP could reverse 30 and 100mmol/L NaIO3 induced loss of viability of RPE by 18.1% (P<0.05) and 16.8% (P<0.01), respectively.CONCLUSION: TMP can significantly protect RPE from NaIO3 induced degeneration in vivo and oxidative stress in vitro and can increase choroidal blood flow markedly in vivo .

BACKGROUND: A herbal preparation, known as RMIT Chinese Medicine 102 (RCM-102) consisting of eight herbs which demonstrates inhibition of the release of key inflammatory mediators associated with seasonal allergic rhinitis (SAR) was used. This study evaluated the efficacy and safety of RCM-102 for SAR. OBJECTIVE: This study evaluated the efficacy and safety of RCM-102 for SAR. METHODS: This randomised placebo-controlled trial involved subjects aged between 18 and 65 who were randomly assigned to either RCM-102 or a placebo group. After a two-week baseline period, all subjects took either RCM-102 or placebo capsules (two capsules each time, three times daily with a four hour interval) for a period of eight weeks. The primary end-points were the Five-Point Scale symptom scores. Rhinoconjunctivitis Quality of Life Questionnaire, relief medication usage, adverse events, kidney and liver function tests and full blood examination were secondary end-points. Intention-to-treat analysis was applied. RESULTS: One hundred and four subjects were randomised with 52 in each group. Ninety-five subjects (47 and 48 subjects in RCM-102 and placebo groups) completed the trial. Nine subjects withdrew from the study prior to the end of the second treatment week. At the end of the trial, there were no significant differences between the two groups with respect to all outcome measures. There were no liver or kidney function abnormalities reported. CONCLUSION: This mechanism-based RCM-102 was safe but not more beneficial than placebo for patients with SAR.
Asian Continental Ancestry Group ; Capsules ; Herbal Medicine ; Humans ; Kidney ; Liver ; Liver Function Tests ; Outcome Assessment (Health Care) ; Plant Preparations ; Quality of Life ; Rhinitis, Allergic, Seasonal ; Seasons

INTRODUCTIONRecurrent non-immune fetal hydrops (NIH) has been reported in the literature but is a rare entity, with fewer than 6 reported cases so far. It has been postulated to be related to a recessive gene.

CLINICAL PICTUREWe report a case of recurrent fetal hydrops in a multigravida with no medical history of note. She presented in her current pregnancy with a significant history of having 4 (out of 7) previous pregnancies affected by hydrops.

TREATMENTAll the affected pregnancies resulted in mid-trimester pregnancy termination (MTPT) following diagnosis in the second trimester. Previous investigations for hydrops did not yield any obvious cause.

OUTCOMEHer most recent pregnancy was unaffected. We discuss the possible differential diagnoses and the likelihood of autosomal recessive metabolic diseases being the aetiological factor.

CONCLUSIONRare causes of fetal hydrops need to be excluded in cases of recurrent non-immune hydrops with no obvious aetiology following routine investigations.

Abortion, Legal ; Adult ; Diagnosis, Differential ; Female ; Humans ; Hydrops Fetalis ; diagnosis ; genetics ; immunology ; Pregnancy ; Prenatal Diagnosis ; Recurrence ; Thalassemia

OBJECTIVETo investigate the relationship of plasma homocysteine (Hcy) levels and the gene polymorphisms of N5, N10-methylenetetrahydrofolate reductase (MTHFR), cystathionine beta-synthase (CBS) with Alzheimer's disease (AD).

METHODSPlasma Hcy levels were measured by means of high voltage capillary electrophoresis with ultra-violet detection, the polymorphisms of C677T in exon 4 of MTHFR gene and 844ins68 in exon 8 of CBS gene were analyzed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) in 105 AD patients and 102 non-AD controls. All controls were excluded from cardiocerebrovascular disorders and other diseases.

RESULTSThe plasma Hcy level in AD patients (16.04 +/- 3.84 micromol/L) was significantly higher than that in the controls (11.94 +/- 3.87 micromol/L, P < 0.001). There were no significant differences of the genotype and allele frequencies of MTHFR C677T mutation and CBS 844ins68 mutation between the patients and controls. However, the T allele of MTHFR gene was found to relate with the plasma Hcy level increase in all subjects.

CONCLUSIONThe elevated plasma Hcy level in AD patients is probably involved in the pathogenesis of AD, which may be due to the environmental factor rather than genetic factors of the mutations of MTHFR and CBS.

Aged ; Aged, 80 and over ; Alzheimer Disease ; enzymology ; genetics ; Cystathionine beta-Synthase ; genetics ; Female ; Gene Frequency ; Genotype ; Homocysteine ; blood ; Humans ; Male ; Methylenetetrahydrofolate Reductase (NADPH2) ; genetics ; Middle Aged ; Mutation ; Polymerase Chain Reaction ; Polymorphism, Genetic ; Polymorphism, Restriction Fragment Length

AIM: The effects of ZX-5, as nitric oxide (NO) donor, on ocular blood flow has been investigated using colored microsphere technique in previous study. The relationship between the production of NO by ZX-5 and ocular blood flow has been evaluated. ZX-5 has been shown to have strong positive effect on increasing choroidal blood flow. However,the effect of ZX-5 on retinal function recovery, the effects of its optical isomers, (R, R)-ZX-5 and (S, S)-ZX-5, on choroidal blood flow and retinal function recovery have not been studied and merit investigation.METHODS: Colored microsphere technique was used for in vivo experiments to determine choroidal blood flow of ocular hypertension (40mmHg) in rabbit eyes. Electroretinography was used to measure the b-wave recovery as an indication of retinal function recovery.RESULTS: (R, R)-ZX-5 increased choroidal blood flow at 10g/L, 50μL instillation into eyes at all time points (P＜0.05).(S, S)-ZX-5 was not effective in increasing choroidal blood flow. ZX-5 and (R, R)-ZX-5 showed significant effects in retinal function recovery after ischemia of the retina at all time points (P＜0.05); whereas (S, S)-ZX-5 did not show significant effect on recovery of b-wave after ischemia at most time points except at 120 and 240 minutes.CONCLUSION: ZX-5 and (R, R)-ZX-5 have high potency in increasing the choroidal blood flow and improving the retinal function recovery. It is hoped that they could be used for the prevention/treatment of ocular blood flow related eye diseases.

BACKGROUNDFew literatures pertain to the 16S ribosomal DNA (16S rDNA) analysis of bacteria contributing to primary and persistent endodontic lesions, with no information available for the Chinese population. As such, we investigated endodontic bacteria associated with primary and persistent endodontic lesions in adult Chinese patients living in Beijing, China using 16S rDNA gene sequencing techniques.

METHODSEndodontic microbial samples were obtained from fourteen adult Chinese patients and subjected to DNA extraction. Pllymerase chain reaction (PCR) products were cloned and 100 clones from each generated library were randomly selected. Purified plasmid DNA with 16S rDNA gene inserts was sequenced, and the sequences were searched against GenBank databases using the BLASTN algorithm. Only significant identification with the highest-scored BLAST result and 99% minimum similarity was considered for phylotyping.

RESULTSMore than 150 taxa were obtained. Primary endodontic infection was mainly associated with Burkholderia cepacia, Actinomyces, Aranicola spp. and Streptococcus sanguinis, whilst Burkholderia cepacia was predominant in the persistent endodontic infections.

CONCLUSIONThere is a difference in the species profile associated with endodontic infections of Chinese patients living in Beijing in comparison to other geographical or ethnic reports.

Bacteria ; classification ; genetics ; pathogenicity ; China ; DNA, Bacterial ; genetics ; DNA, Ribosomal ; genetics ; Female ; Humans ; Male ; Pulpitis ; microbiology ; Sequence Analysis, DNA ; methods