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Biomedical subjects

B Molinari

Publications and source records attributed to B Molinari.

13 recordsLinked to original sources
PubMed1999

Total abdominal hysterectomy: a randomized study comparing two techniques.

BACKGROUND: Abdominal hysterectomy is the most frequent operation performed by gynecologists. The most commonly used techniques are intrafascial, extrafascial and supracervical hysterectomy; in our department we mainly use the first method. A variant of this technique, because during the operation we use only an Allis clamp, simplifies the operation and maintains certain anatomical relationships between neighbouring pelvic structures. METHODS: To compare two different surgical techniques between 1/1/1991 and 31/12/95, 262 women were randomized pre-operatively: 133 by the intrafascial technique of Richardson and 129 by the variant hysterectomy technique. The difference between the two techniques (Richardson versus variant hysterectomy technique), as performed in our department, was investigated regarding the clamping of uterine vessels, the resection of uterosacral and cardinal ligament. The two-tailed student test was used for continuous data and chi2 analysis for discrete data. RESULTS: Less blood loss occurred in the variant than in the Richardson group (P<0.01) and no intrasurgical complications occurred as compared to one case of ureter lesion in the Richardson group. There were no differences in the number of days of hospitalization. No particular post-surgical complications occurred in the follow-up period, which has now elapsed. After 36 months of follow-up the variant group showed a reduced incidence (not significant) of vaginal vault prolapse. The patients who underwent the variant hysterectomy technique reported better compliance with regard to sexual intercourse and urinary function than the Richardson group. CONCLUSION: We conclude that the variant hysterectomy technique is as valid as the Richardson technique, giving the surgeon the possibility of maintaining certain anatomical relationships between neighbouring pelvic structures. It also has minor delayed complications.

Adult↗
PubMed1998

Serotonergic modulation of acetylcholine release from cortex of freely moving rats.

The modulation of acetylcholine (ACh) release by 5-HT3 receptor activation was studied using in vivo microdialysis. Spontaneous and K+-stimulated ACh release were measured in frontoparietal cortex and hippocampus of freely moving rats. Two consecutive exposures to high K+ produced ACh release of similar magnitude. In the cortex, serotonin (5-HT) failed to alter spontaneous ACh release, but caused a concentration-dependent decrease of K+-evoked ACh release. Phenylbiguanide (PBG) and m-chlorophenylbiguanide, two selective 5-HT3 agonists, mimicked the 5-HT responses, but 8-hydroxy-2-(di-n-propylamino)tetralin, a selective 5-HT1A agonist, was without effect. However, PBG failed to modify K+-evoked ACh release from the hippocampus. Systemic and local administration of a highly selective 5-HT3 antagonist, tropisetron ((3-alpha-tropanyl)1H-indole-carboxylic acid ester) blocked the effect of both 5-HT and PBG. The inhibition of ACh release by PBG was sensitive to tetrodotoxin. These observations provide direct evidence that, in rat cortex, 5-HT modulates in-vivo release of ACh through activation of 5-HT3 receptors.

Acetylcholine↗
PubMed1997

Atypical association of H1 and H2 histamine receptors with signal transduction pathways during multistage mouse skin carcinogenesis.

OBJECTIVE: In the present work we studied the association of histamine receptors with second messengers during multistage carcinogenesis in Sencar mice skin. METHODS: 96 Sencar female mouse, divided into six groups were used. Tumors appeared only in the 7, 12-dimethylbenz[a]anthracene-initiated and 12-O-tetradecanoylphorbol-13-acetate-promoted group. Control groups received only TPA, or acetone or no treatment at all. Periodically during the promotion period, cAMP and inositol phosphate production were measured after stimulation with H1 or H2 agonists in samples from all groups. RESULTS: In non-treated skin, H1 receptors were coupled to phosphatidylinositol hydrolysis and H2 receptors mediated cAMP production. Conversely, in tumors H2 receptors were associated with phosphatidylinositol hydrolysis and H1 mediated a rise in cAMP levels. The skin among tumors and the skin from all control groups maintained the same coupling as non-treated skin. An increase in mast cell number, with a homogeneous subepithelial distribution and marked phenotypic changes, was also observed in promoted skin. CONCLUSIONS: These findings indicate an atypical association of histamine receptors with second messengers that could be a critical feature for the postulated action of histamine in tumor growth.

9,10-Dimethyl-1,2-benzanthracene↗
PubMed1990

Increased secretory activity and estradiol receptor expression are among other relevant aspects of MCF-7 human breast tumor cell growth which are expressed only in the absence of serum.

We compared the morphology, clonogenic ability, Percoll gradient distribution, estrogen receptor proteins, and interactions with mesenchymal cells in MCF-7 breast tumor cells grown in medium containing fetal calf serum and insulin (FCS-I) or in a defined medium with insulin (ID) as the only growth factor. In the absence of serum and at densities below 5000-8000 cells/cm2, MCF-7 cells required epidermal growth factor, insulin, and thrombin. When cells reached a density of 23,000-26,000 cells/cm2, only insulin was necessary for optimal growth. In ID medium cells showed an enlarged Golgi apparatus and marked plasma membrane modifications, suggesting increased secretory activity. Moreover there was an increase in the release of protein products to the culture medium and a time-dependent ability of these cells to form macrocolonies in soft agar. On the contrary, cells in FCS-I showed no Golgi complex and few plasma membrane modifications. In both culture media tight junctions, desmosomes, and tonofilaments were present. We investigated the effect of conditioned media from MCF-7 cells growing in FCS-I or ID on the growth of primary rat vaginal fibroblasts. The growth of these mesenchymal cells was stimulated by FCS-I medium and inhibited by ID medium. By contrast, the embryonic fibroblast (preadipocyte) line CHEF/18 was also stimulated by FCS-I for the first 48 h, but thereafter ceased growth and acquired lipid droplets and a differentiated morphology. With ID medium, CHEF/18 cells were only partially inhibited with no changes in morphology. The Percoll gradient profiles of ID cells showed the same six fractions of increasing density as recently described. However, there was a progressive increase in subpopulations with higher growth rates and a decrease in the relative amount of the most differentiated cells. A unique feature of the growth analysis of MCF-7 cells in the absence of serum is the increased expression of the estradiol receptor gene. These studies show that the growth and differentiated properties of tumor cells can depend upon the cellular environment and offer a model system in which to further study this modulation.

Animals↗
PubMed1986

Is the carcinoembryonic antigen test a valid predictor of response to medical therapy in disseminated breast cancer?

In 30 of 63 patients with disseminated breast cancer, CEA became positive before medical therapy. Treatment response was obtained in 63.3% of CEA-positive patients compared to 15.2% of CEA-negative patients. The CEA-positive patients also had a longer relapse-free survival, a longer survival from diagnosis of metastases, and a longer overall survival from primary surgery than CEA-negative patients. CEA production appears to be an important and favorable prognostic factor in disseminated breast cancer and determinant of treatment response.

Breast Neoplasms↗
PubMed1984

The role of carcinoembryonic antigen in the postmastectomy follow-up of primary breast cancer and in the prognostic evaluation of disseminated breast cancer.

Serum levels of carcinoembryonic antigen (CEA) were evaluated in 145 patients with breast cancer. There were 107 patients with "indolent" disease: 8 had previous metastases in complete posttherapeutic remission and were CEA-negative; CEA became positive in 2 of 3 of these cases who subsequently relapsed. The other 99 patients were without clinical evidence of disease after mastectomy. Of these, 82 were disease-free and CEA-negative, 2 relapsed and simultaneously became CEA-positive, 4 had recurrences but remained CEA-negative, 4 became CEA-positive but without clinical signs of metastases, and 7 became CEA positive before the clinical-instrumental diagnosis of metastasis. CEA was positive in 23 of 38 patients (60.5%) with "active" disease. Response to medical therapy occurred in 6.6% of CEA-negative patients compared to 55.0% of CEA-positive patients. Among CEA-positive patients, there was a similar percentage of response to medical therapy in patients with small (50.0%) or large (56.5%) tumor burden. A response to medical therapy was observed in all patients with a disease-free interval equal to or greater than 24 months and CEA-positive.

Breast Neoplasms↗
PubMed1979

Increased risk of diabetes mellitus in beta- thalassemia major due to iron overload.

Frequent transfusions improve the general well being in patients with beta-thalassemia major but carry the risk of iron intoxication including the development of diabetes mellitus. Of 22 patients with beta-thalassemia major (age 3-17 years) only 3 had a normal oral glucose tolerance. The remainder had either borderline or moderately pathological glucose curves. The mean glucose concentration was increased, and the mean insulin concentration and insulin/glucose ratio were diminished. In contrast to the oral test, the i.v. glucose tolerance test gave pathological results in only 2 of 16 patients tested. The i.v. glucose test thus may be less selective than the oral test. The mean insulin concentration was lower also after intravenous glucose, but the early insulin peak was preserved. Arginine infusion led to a normal insulin and growth hormone release. This moderate impairment of insulin release found in most of the patients leaves the hope that an efficient chelating therapy scheme might reverse beta-cell dysfunction.

Adolescent↗