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Jie Jin

Publications and source records attributed to Jie Jin.

65 records · Page 4Linked to original sources
PubMed2004

[Pharmacodynamics and pharmacokinetics of vardenafil in patients with erectile dysfunction].

Vardenafil is a potent and highly selective phosphodiesterase type 5 (PDE5) inhibitor with a potency about 10-fold higher than sildenafil. Vardenafil can significantly improve erectile function and works rapidly. Vardenafil is a PDE5 inhibitor with the fastest onset of action among its kind so far found and works as early as 10 minutes after oral administration, providing patients with penile erection sufficient to complete an intercourse. The absolute oral bioavailability is about 15%. Vardenafil is rapidly absorbed with a median tmax of 0.7 h and a terminal half-life (t1/2) of more than 4 h. The observed pharmacodynamic properties, pharmacokinetic characteristics and good safety and tolerability profile showed that vardenafil treatment provides an effective and generally well tolerated treatment for ED.

Adolescent↗
PubMed2004

[Analysis of 32 cases of acute leukemia with abnormality of chromosome 7].

OBJECTIVE: To explore the incidence and prognostic significance of chromosome 7 anomaly in acute leukemia. METHODS: Conventional cytogenetic analysis of R-band was used to detect the abnormalities of chromosome 7 in 410 acute leukemia patients. RESULTS: Thirty-two cases (7.8%) with abnormalities of chromosome 7, of which 19 (59.4%) had -7/7q-; 3(9.4%) had t(7;11); and the rest had other abnormalities such as der(7), +7, t(2;7), t(5;7), t(7;9), t(7;8) and dic(1;7). The incidence of -7/7q- in M0, M1 and M2 was higher than that in other subtypes of acute myeloid leukemia (AML). Twenty cases had additional cytogenetic aberrations, such as t(9;22) with -7, +8, -5. In 30 cases treated with chemotherapy, 11 cases acquired complete remission (CR) and the CR rate was lower than that for all concurrent cases of acute leukemia(36.7% vs 65.8%); the CR rate of AML with -7/7q- was lower than that of AML with normal karyotype(25% vs 55.6%). There was no difference in the CR rate between acute lymphocytic leukemia(ALL) with -7/7q- and ALL with normal chromosome (57.1% vs 77.8%), but 4 cases with -7/7q- which attained complete remission for a time relapsed early. In other 11 patients with additional chromosome 7 aberration, only 4 patients acquired CR. CONCLUSION: -7/7q- was the frequent aberration in chromosome 7 anomaly, which was often detected in M0, M1 and M2. It might be associated with the pathogenesis of acute leukemia; the patients with chromosome 7 anomaly had poorer prognosis.

Adolescent↗
PubMed2003

TetL tetracycline efflux protein from Bacillus subtilis is a dimer in the membrane and in detergent solution.

The TetL antiporter from the Bacillus subtilis inner membrane is a tetracycline-divalent cation efflux protein that is energized by the electrochemical proton gradient across the membrane. In this study, we expressed tetL in Escherichia coli and investigated the oligomeric state of TetL in the membrane and in detergent solution. Evidence for an oligomeric state of TetL emerged from SDS-PAGE and Western blot analysis of membrane samples as well as purified protein samples from cells that expressed two differently tagged TetL species. Furthermore, no formation or restoration of TetL oligomers occurred upon detergent solubilization of the membrane. Rather, oligomeric forms established in vivo persisted after solubilization. Mass spectrometry of the purified protein showed the absence of proteolysis and posttranslational modifications. Analytical size-exclusion chromatography of the purified protein revealed a dimeric TetL in dodecyl-maltoside solution. In addition, TetL dimers were found in a number of other detergents and over a wide pH range. It is therefore likely that the oligomeric form of the protein in the membrane is also a dimer.

Antiporters↗
PubMed2003

FCGR3B gene frequencies and FCGR3 variants in a Chinese population from Zhejiang Province.

The human neutrophil antigens HNA-1a, -1b and -1c play an important role in immune neutropenia. The frequencies of the coding FCGR3B genes were determined in different populations. New FCGR3B variants were also found in some populations. This study investigated the FCGR3B gene frequencies and FCGR3 variants in a Chinese population compared with the results of Northern Germans and African Blacks (Uganda). Our results show that the gene frequencies in 413 healthy Chinese individuals from Zhejiang Province were 0.565 for FCGR3B*1, 0.430 for FCGR3B*2 and 0.00 for FCGR3B*3. The genotype frequency of FCGR3B(null) was 0.48% (2/413). Sequencing of FCGR3 revealed that in seven out of 19 Chinese individuals, cloned and sequenced DNA fragments that exhibited variants caused by single nucleotide exchanges at one or more of the polymorphic positions 141, 147, 227, 266 and 277 in exon 3 also existed in this Chinese population. From the present study, it is concluded that the FCGR3B*1 gene is more frequent in a Chinese population from Zhejiang Province than the FCGR3B*2 gene, and the FCGR3B*3 gene seems to be absent, which is in contrast to studies in the white populations. Gene variants caused by single nucleotide exchanges were found in addition to the well-known forms, but the reason for this remains unclear.

Alleles↗
PubMed2003

[The expression of human telomerase reverse transcriptase mRNA and its significance in acute leukemia].

To investigate the expression of hTERT mRNA in bone marrow mononuclear cells (MNCs) from acute leukemia patients, the method of semi-quntitative RT-PCR was used to examine the expression of hTERT mRNA in marrow MNCs, and the telomerase activity of marrow MNCs was determined with the method of TRAP-PCR-ELISA by using a commercial kit. The results indicated that the expression of hTERT mRNA of marrow MNCs in 30 untreated AL patients was markedly higher than that in 12 CR cases (0.71 +/- 0.34 vs 0.43 +/- 0.25, P < 0.05) and 6 normal volunteers (0.71 +/- 0.34 vs 0.22 +/- 0.21, P < 0.01), respectively. Telomerase activity of marrow MNCs in 30 untreated AL patients was significantly higher than that in 12 CR cases (0.235 +/- 0.395 vs 0.012 +/- 0.015, P = 0.007). Moreover, there was a positive correlation between the hTERT mRNA synthesis and telomerase activity in AL cells (r = 0.421, P < 0.01). The pencentage of blast cells in marrow smear of the untreated AL patients was positively correlated with both the expression of hTERT mRNA and the telomerase activity of bone marrow MNCs (r = 0.457, P < 0.05 and r = 0.411, P < 0.05), respectively. It is concluded that the expression of hTERT mRNA in bone marrow MNCs from untreated AL patients was correlated with their telomerase activity. It is suggested that the expression of hTERT mRNA leukemic cells indicates their higher proliferation ability.

Acute Disease↗
PubMed2003

[Etiology and management of persistent hematospermia: a pilot study].

OBJECTIVES: To study the etiology of persistent hematospermia and to evaluate the efficacy of transrectal ultrasonography (TRUS)-guided transperineal needle aspiration and irrigation for diagnosis and treatment of persistent hematospermia. METHODS: Twelve patients were included in the study, with a mean age of (36.4 +/- 10.8) years old, and a mean duration of the disease of (13.9 +/- 6.4) months. After the expressed prostatic secretion (EPS) by prostatic massage was cultured, patients with recurrent hematospermia received TRUS-guided transperineal needle aspiration for seminal vesicle fluid (SVF), which was sent for bacteriological and cytological examination. If the EPS culture were positive, certain antibiotics according to the drug sensitivity assay were injected into the abnormal seminal vesicle(s) via TRUS-guided transperineal needle puncture. The treatment would be repeated one month later if the patients still had hematospermia. The patients were followed up every three months. RESULTS: Abnormal images were found in left seminal vesicle (SV) in 4 cases, right in 3 cases, bilateral in 2 cases, and no abnormal findings in 3 cases. The abnormal findings included: 7 cases of SV and/or ejaculatory duct dilation, 3 cases of thickening SV wall, 3 cases of calcification or calculi of SV, and 1 case of Müllerian duct cyst. SVF cultures were positive in 7 cases: methicillin-resistant Staphylococcus aureus (MRSA) 4 cases, methicillin-resistant coagulase-negative Staphylococcus (MRCNS), E. Coli, Proteus mirabilis 1 case, respectively. In five of these 7 cases, bacteriological cultures of SVF and EPS showed the same results. All patients were treated by TRUS-guided transperineal injection of certain antibiotics into SV. Seven cases were injected once, 5 cases twice. The mean follow-up period of 10 patients was (16.7 +/- 5.9) months. Hematospermia disappeared in 6 cases. CONCLUSIONS: SV infection of bacteria, especially infection of the drug resistant strains was one of the main causes of persistent hematospermia. The difficulties in treatment of persistent hematospermia were due to infection of drug resistant bacteria, calcification or calculi of SV, obstruction of ejaculatory duct. TRUS-guided transperineal aspiration of SVF was helpful to the etiologic diagnosis of persistent hematospermia.

Adult↗
PubMed2003

[Clinical and experimental study of 38 cases with trisomy 8].

OBJECTIVE: To study the role of trisomy 8 in pathogenesis and progression of hematologic disease with trisomy 8. METHODS: The clinical data on 38 cases with trisomy 8 were investigated retrospectively. Fluorescence in situ hybridization (FISH) using Spectrum Orange labeled chromosome 8 centromere specific probe was carried out to detect trisomy 8 in 10 cases. RESULTS: Thirty-two of 38(84.2%) cases with trisomy 8, and fourteen of 17(82.4%) cases with trisomy 8 as the sole chromosome aberration were myeloid disorders such as myelodysplastic syndrome (MDS), acute myelocytic leukemia (AML), chronic myelocytic leukemia (CML). The incidence of trisomy 8 was higher in myeloid disease than in lymphocytic disease (5% vs 1.3%); the incidence of trisomy 8 was higher in acute monocytic leukemia than in other AML (6.1% vs 2.4%), and the incidence of trisomy 8 in chronic myelomonocytic leukemia( CMML) was higher than that in other myelodysplastic syndrome (MDS) (25% vs 13.2%); 17 cases had trisomy 8 as the sole chromosome aberration, 21 cases had other additional chromosome aberrations. The chromosome aberration was confirmed by FISH in 10 cases with trisomy 8 as the sole chromosome aberration. Eleven cases were treated with chemotherapy, among them only 10 cases data were available. Seven cases acquired complete remission but 3 of them were M3, the other 3 cases had no response after two courses of chemotherapy. CONCLUSION: Trisomy 8 may play an important role in the pathogenesis and progression of the hematological disease, especially myeloid disease. Trisomy 8 might be related with differentiation abnormality of monocyte.

Adolescent↗
PubMed2002

Tet(L) and tet(K) tetracycline-divalent metal/H+ antiporters: characterization of multiple catalytic modes and a mutagenesis approach to differences in their efflux substrate and coupling ion preferences.

The Tet(L) protein encoded in the Bacillus subtilis chromosome and the closely related Tet(K) protein from Staphylococcus aureus plasmids are multifunctional antiporters that have three cytoplasmic efflux substrates: a tetracycline-divalent metal (TC-Me(2+)) complex that bears a net single positive charge, Na+, and K+. Tet(L) and Tet(K) had been shown to couple efflux of each of these substrates to influx of H+ as the coupling ion. In this study, competitive cross-inhibition between K+ and other cytoplasmic efflux substrates was demonstrated. Tet(L) and Tet(K) had also been shown to use K+ as an alternate coupling ion in support of Na+ or K+ efflux. Here they were shown to couple TC-Me(2+) efflux to K+ uptake as well, exhibiting greater use of K+ as a coupling ion as the external pH increased. The substrate and coupling ion preferences of the two Tet proteins differed, especially in the higher preference of Tet(K) than Tet(L) for K+, both as a cytoplasmic efflux substrate and as an external coupling ion. Site-directed mutagenesis was employed to test the hypothesis that some feature of the putative "antiporter motif," motif C, of Tet proteins would be involved in these characteristic preferences. Mutation of the A157 in Tet(L) to a hydroxyamino acid resulted in a more Tet(K)-like K+ preference both as coupling ion and efflux substrate. A reciprocal S157A mutant of Tet(K) exhibited reduced K+ preference. Competitive inhibition among substrates and the parallel effects of the single mutation upon K+ preference, as both an efflux substrate and coupling ion, are compatible with a model in which a single translocation pathway through the Tet(L) and Tet(K) transporters is used both for the cytoplasmic efflux substrates and for the coupling ions, in an alternating fashion. However, the effects of the A157 and other mutations of Tet(L) indicate that even if there are a shared binding site and translocation pathway, some elements of that pathway are used by all substrates and others are important only for particular substrates.

Amino Acid Sequence↗
PubMed2002

Site-directed mutagenesis studies of selected motif and charged residues and of cysteines of the multifunctional tetracycline efflux protein Tet(L).

All of the transmembrane glutamates of Tet(L) are essential for tetracycline (TET) resistance, and E397 has been shown to be essential for all catalytic modes, i.e., TET-Me(2+) and Na(+) efflux and K(+) uptake. Loop residues D74 and G70 are essential for TET flux but not for Na(+) or K(+) flux. A cysteineless Tet(L) protein exhibits all activities.

Antiporters↗
PubMed2002

[Physicians' knowledge and attitude to erectile dysfunction].

OBJECTIVES: The physicians knowledge and attitude to erectile dysfunction (ED) is very important to the diagnosis and management of this disease. We investigated the physicians and practitioners knowledge of ED, attitude to ED, and if they actively find the underlying ED patients. METHODS: Three hundreds and one physicians and practitioners in Beijing completed a questionnaire. The subjects included urologists, cardiologists, endocrinologists, surgeons, orthopaedicians and community practitioners. RESULTS: The definition of ED was well known by most subjects (83.4%). Many agreed that ED was a common condition in the aging men (85.0%), and it was an important health problem (78.7%) and it was the local signs of certain systemic diseases (89.7%). The most common risk factors of ED enumerated by the physicians were diabetes (45.5%), hypertension (12.6%) and coronary artery diseases (12.0%). 45.5% physicians met the patients who initiated questions about ED. 32.6% physicians would discuss ED with the patients if the patients initiate questions about ED. 95.0% non-urological physicians would refer the ED patients to urologists or andrologists. 43.5% of all the physicians never asked their patients about erectile function, this proportions in the subgroups of urologists, non-urological physicians and community practitioners were 7.2%, 55.3% and 60.5% respectively (P < 0.01). The most common reasons for the physicians not to initiate the inquiries about ED was "the patients would not have ED if they didnt complain about it" (42.2%), "there was no ED patients in my specialty" (20.9%), "diagnosis and treatment of ED was not my business" (17.3%), "have no time" (15.6%), "feel embarrassed" (13.6%). CONCLUSIONS: Most physicians regarded ED as an important health problem and a common condition in aging men, but they didnt take an active attitude to ED in their clinical practice.

Aging↗