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Biomedical subjects

E Johansson

Publications and source records attributed to E Johansson.

227 records · Page 13Linked to original sources
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Effects of progesterone on uterine leiomyoma growth and apoptosis.

Uterine leiomyomas appear during the reproductive years and regress after menopause, indicating the ovarian steroid-dependent growth potential. Recently we have found that the use of levonorgestrel-releasing intrauterine system (IUS) is effective in the long-term contraception and management of menorrhagic women with uterine myomas because of a striking reduction in menorrhagia. These clinical experiences prompted us to characterize the effects of progestin on the proliferation and apoptosis of leiomyoma cells cultured in vitro. As epidermal growth factor (EGF) has been shown to mediate estrogen action and play a crucial role in regulating leiomyoma growth, we also investigated the effects of sex steroids on EGF and EGF receptor (EGF-R) expression in leiomyoma cells. In cultures of leiomyoma cells, the addition of either E(2) (10 ng/ml) or P(4) (100 ng/ml) resulted in an increase in proliferating cell nuclear antigen (PCNA) expression in the cells; whereas in cultures of normal myometrial cells, the addition of E(2) augmented PCNA expression in the cells, but P(4) did not. Immunoblot analysis revealed that leiomyoma cells contained immunoreactive EGF and that P(4) treatment resulted in an increase in EGF expression in the cells. In contrast, E(2) treatment augmented EGF-R expression in cultured leiomyoma cells, but P(4) did not. These results indicate that P(4) up-regulates the expression of PCNA and EGF in leiomyoma cells, whereas E(2) up-regulates the expression of PCNA and EGF-R in those cells. It is, therefore, conceivable that P(4) and E(2) act in combination to stimulate the proliferative potential of leiomyoma cells through the induction of EGF and EGF-R expression. We also found that Bcl-2 protein, an apoptosis-inhibiting gene product, was abundantly expressed in leiomyoma relative to that in normal myometrium, suggesting that the abundant expression of Bcl-2 protein in leiomyoma cells may be one of the molecular bases for the enhanced growth of leiomyoma relative to that of normal myometrium in the uterus. Furthermore, Bcl-2 protein expression in leiomyoma cells was up-regulated by P(4), but down-regulated by E(2). Therefore, it seems likely that P(4) may also participate in leiomyoma growth through the induction of Bcl-2 protein in leiomyoma cells.

Apoptosis↗
PubMedDate not supplied

Three-block bi-focal PLS (3BIF-PLS) and its application in QSAR.

When X and Y are multivariate, the two-block partial least squares (PLS) method is often used. In this paper, we outline an extension addressing a special case of the three-block (X/Y/Z) problem, where Z sits "under" Y. We have called this approach three-block bi-focal PLS (3BIF-PLS). It views the X/Y relationship as the dominant problem, and seeks to use the additional information in Z in order to improve the interpretation of the Y-part of the X/Y association. Two data sets are used to illustrate 3BIF-PLS. Example I relates to single point mutants of haloalkane dehalogenase from Sphingomonas paucimobilis UT26 and their ability to transform halogenated hydrocarbons, some of which are found as organic pollutants in soil. Example II deals with soil remediation capability of bacteria. Whole bacterial communities are monitored over time using "DNA-fingerprinting" technology to see how pollution affects population composition. Since the data sets are large, hierarchical multivariate modelling is invoked to compress data prior to 3BIF-PLS analysis. It is concluded that the 3BIF-PLS approach works well. The paper contains a discussion of pros and cons of the method, and hints at further developmental opportunities.

DNA Fingerprinting↗
PubMedDate not supplied

Urinary excretion half-life of delta 1-tetrahydrocannabinol-7-oic acid in heavy marijuana users after smoking.

The urinary excretion of the total amount of delta 1-tetrahydrocannabinol (delta 1-THC) metabolites, with special emphasis on delta 1-tetrahydrocannabinol-7-oic acid (delta 1-THC-7-oic acid), was studied in thirteen heavy Cannabis users after smoking administration of delta 1-THC, followed by a four week discontinuation period. The total amount of delta 1-THC metabolites and the levels of delta 1-THC-7-oic acid could be followed up to 25 days after abstinence using EMIT d.a.u. cannabinoid assay and high-performance liquid chromatography (HPLC). The urinary excretion half-life, calculated from the concentrations of delta 1-THC-7-oic acid versus time, ranged from 0.8-9.8 days with a mean (+/- SD) of 3.0 +/- 2.3 days. Most of the delta 1-THC-7-oic acid was excreted as conjugate and only trace amounts of unconjugated delta 1-THC-7-oic acid were detected. The total concentrations of delta 1-THC-7-oic acid in urine were compared to the concentrations of "cross-reacting cannabinoids", within the linear range of 20-75 ng/mL, obtained in the semiquantitative EMIT d.a.u. cannabinoid assay. The average ratio of "EMIT concentrations"/delta 1-THC-7-oic acid concentrations obtained by HPLC analysis was 1.23 +/- 84% (C.V.) for 78 urine samples. A total of 83% of the samples with positive EMIT levels (cutoff 20 ng/mL) was confirmed by HPLC analysis (cutoff 7 ng/mL).

Cannabinoids↗
PubMedDate not supplied

Human urinary excretion profile after smoking and oral administration of [14C]delta 1-tetrahydrocannabinol.

The urinary excretion profiles of delta 1-tetrahydrocannabinol (delta 1-THC) metabolites have been evaluated in two chronic and two naive marijuana users after smoking and oral administration of [14C]delta 1-THC. Urine was collected for five days after each administration route and analyzed for total delta 1-THC metabolites by radioactivity determination, for delta 1-THC-7-oic acid by high-performance liquid chromatography, and for cross-reacting cannabinoids by the EMIT d.a.u. cannabinoid assay. The average urinary excretion half-life of 14C-labeled delta 1-THC metabolites was calculated to be 18.2 +/- 4.9 h (+/- SD). The excretion profiles of delta 1-THC-7-oic acid and EMIT readings were similar to the excretion profile of 14C-labeled metabolites in the naive users. However, in the chronic users the excretion profiles of delta 1-THC-7-oic acid and EMIT readings did not resemble the radioactive excretion due to the heavy influence from previous Cannabis use. Between 8-14% of the radioactive dose was recovered in the urine in both user groups after oral administration. Lower urinary recovery was obtained both in the chronic and naive users after smoking--5 and 2%, respectively.

Administration, Inhalation↗
PubMedDate not supplied

Patients' experience of ambulatory self-administration of pamidronate in multiple myeloma.

The aim was to explore ambulatory self-administration of Pamidronate (Self-A-Pam) from a patient perspective in patients with multiple myeloma. Pamidronate is normally administered once a month as an intravenous infusion over 2 to 4 hours. Twenty-one patients were included, of whom 13 (6 women, 7 men) with a median age of 56 years (range 37-70) completed the educational program and subsequent ambulatory Self-A-Pam. An RN at the hospital initiated the Pamidronate therapy (90 mg). The patients then left hospital and later, on completion, they disconnected the infusion, either alone or with the assistance of a relative or significant other. Interviews were used to collect information about the experiences during the course of the Self-A-Pam. In total, 12 patients were interviewed after 3 doses of Self-A-Pam. One patient declined to participate in the interview. A qualitative analysis of the textual data was performed. Five main categories were identified: decision concerning Self-A-Pam, information and education, sources of practical help or support, effects of Self-A-Pam, and feelings and activities in relation to place (hospital, home, or public place). All 13 patients who started on Self-A-Pam went through 3 courses of Self-A-Pam during the study period. Many patients reported a gain in feelings of freedom/independence and time saving. However, some patients reported insufficient education and feelings of anxiety associated with the responsibility of handling the venous access device.

Adaptation, Psychological↗
PubMedDate not supplied

Gonorrhea, genital chlamydial infection, and nonspecific urethritis in male partners of women hospitalized and treated for acute pelvic inflammatory disease.

BACKGROUND AND OBJECTIVES: Acute pelvic inflammatory disease (PID) is often a complication to a sexually transmitted disease (STD), the most important agents being Neisseria gonorrhoeae and Chlamydia trachomatis. However, very little is known of the genitourinary status of the male partners of women with acute pelvic inflammatory disease (PID). GOAL OF THIS STUDY: To determine the presence of N. gonorrhoeae and/or C. trachomatis infection or nonspecific urethritis (NSU) in regular sexual male partners of women with acute PID. STUDY DESIGN: Two hundred regular sexual male partners to 196 women admitted to a hospital for treatment of acute PID were referred by contact tracing to the sexually transmitted disease outpatient clinic for clinical and laboratory examination regarding N. gonorrhoeae and/or C. trachomatis infection, or NSU defined as the presence of > 5 polymorphonuclear leukocytes per high-power field (x1,000) in > 4 fields and with negative laboratory tests for N. gonorrhoeae and C. trachomatis. RESULTS: The majority of the males was in the age group 20 to 29 years of age, female sexual partners in 15 to 24 years years of age. N. gonorrhoeae was demonstrated in 42.9% of the male partners to women with acute PID and concomitant gonorrhea. The corresponding figure for C. trachomatis was 43.7%. Nonspecific urethritis was diagnosed in 26 (33.8%) of the male partners to 77 women were diagnosed with N. gonorrhoeae and/or C. trachomatis infection, and in 45 (37.8%) partners of 119 women without such an infection. In all, N. gonorrhoeae, C. trachomatis or NSU were demonstrated in 117 (59.7%) of the 196 male partners, but only 32% of the males with N. gonorrhoeae or C. trachomatis and 8.5% of those with NSU presented subjective symptoms of urethritis. CONCLUSION: The findings of the study stress the need for routine clinical and laboratory examination and treatment of sexual male partners to women with acute PID.

Acute Disease↗