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Pathogen research abs 1 || Pathogen research abs 2 || Pathogen research abs 3 || Pathogen research abs 4 || Pathogen research abs 5 ||
Hormone and endocrine research abs 1 || Hormone and endocrine research abs 2 || Hormone and endocrine research abs 3 || Hormone and endocrine research abs 4 || Hormone and endocrine research abs 5
Dermatology. 2002;204(4):325-9.
Skin tensile properties in patients treated for acromegaly.
Braham C, Betea D, Pierard-Franchimont C, Beckers A, Pierard GE.
Department of Dermatopathology, University Medical Center of Liege, Belgium.
BACKGROUND: Somatotropic effects are described in the skin. Indeed, acromegaly is in part clinically recognized by cutaneous coarsening. The actual changes in tensile properties associated with the cutaneous manifestations are largely unknown. OBJECTIVES: To study the relationships between the skin tensile properties and the severity of acromegaly as assessed by serum levels of growth hormone (GH) and insulin-like growth factor 1 (IGF-1). PATIENTS AND METHOD: Assessments were made in 13 patients with acromegaly treated by somatostatin agonists combined or not with surgery. A total of 39 age- and sex-matched healthy subjects served as controls. Skin tensile properties were measured on the forearm and nape of the neck using a computerized suction device. RESULTS: Significant differences were yielded between the skin tensile properties in patients and normal subjects. The highest IGF-1 values in the patients' medical records were positively correlated with both skin distensibility and biologic elasticity. The most recent IGF-1 serum levels were negatively correlated with the visco-elastic ratio. No correlations were yielded between any of the biomechanical parameters and GH levels, disease duration and treatment dosages, respectively. CONCLUSION: The skin in acromegaly appears to be functionally more redundant and elastic than normal skin. The biomechanical changes appear quite different from those observed in other diseases with collagen deposition such as diabetes mellitus and scleroderma. 2002 S. Karger AG, Basel
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12077539&dopt=Abstract
Endocrinology. 2003 Jan;144(1):101-9.
Sex difference in hepatic peroxisome proliferator-activated receptor alpha expression: influence of pituitary and gonadal hormones.
Jalouli M, Carlsson L, Ameen C, Linden D, Ljungberg A, Michalik L, Eden S, Wahli W, Oscarsson J.
Department of Physiology and Pharmacology, Goteborg University, Goteborg S-405 30, Sweden.
Peroxisome proliferator-activated receptor (PPAR) alpha is a nuclear receptor that is mainly expressed in tissues with a high degree of fatty acid oxidation such as liver, heart, and skeletal muscle. Unsaturated fatty acids, their derivatives, and fibrates activate PPARalpha. Male rats are more responsive to fibrates than female rats. We therefore wanted to investigate if there is a sex difference in PPARalpha expression. Male rats had higher levels of hepatic PPARalpha mRNA and protein than female rats. Fasting increased hepatic PPARalpha mRNA levels to a similar degree in both sexes. Gonadectomy of male rats decreased PPARalpha mRNA expression to similar levels as in intact and gonadectomized female rats. Hypophysectomy increased hepatic PPARalpha mRNA and protein levels. The increase in PPARalpha mRNA after hypophysectomy was more pronounced in females than in males. GH treatment decreased PPARalpha mRNA and protein levels, but the sex-differentiated secretory pattern of GH does not determine the sex-differentiated expression of PPARalpha. The expression of PPARalpha mRNA in heart or soleus muscle was not influenced by gender, gonadectomy, hypophysectomy, or GH treatment. In summary, pituitary-dependent hormones specifically regulate hepatic PPARalpha expression. Sex hormones regulate the sex difference in hepatic PPARalpha levels, but not via the sexually dimorphic GH secretory pattern.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12488335&dopt=Abstract
J Orthop Sci. 2002;7(3):379-85.
Comparative effects of intermittent administration of human parathyroid hormone (1-34) on cancellous and cortical bone loss in tail-suspended and sciatic neurectomized young rats.
Moriyama I, Iwamoto J, Takeda T, Toyama Y.
Department of Orthopaedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
We compared the effects of intermittent administration of human parathyroid hormone (PTH) (1-34) on tibial cancellous and cortical bone loss in tail-suspended and sciatic neurectomized young rats. Forty-eight 6-week-old male Wistar rats were randomly divided into six groups with eight animals each: age-matched controls (AMC), tail suspension (TS), sciatic neurectomy (NX), AMC + PTH, TS + PTH, and NX + PTH. Fifteen days after the start of the experiment, the proximal tibia and tibial shaft were processed for cancellous and cortical bone histomorphometric analyses, respectively. The reduction of cancellous bone volume (BV/TV) was significantly greater in the TS group than in the NX group, whereas the reduction of percent cortical area (Ct Ar) did not differ significantly between the TS and NX groups. Administration of human PTH to rats in the TS and NX groups increased BV/TV to a level significantly higher than that of the AMC group. Administration of human PTH to rats in the NX group significantly increased percent Ct Ar, but percent Ct Ar of the NX group was still significantly lower than that of the AMC group. Administration of human PTH to rats in the TS group did not significantly affect percent Ct Ar. These findings suggest that intermittent administration of human PTH (1-34) at the dose we used may completely prevent cancellous bone loss both in TS and NX young rats, and that it may not affect cortical bone loss in TS young rats but only attenuate it in NX young rats.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12077665&dopt=Abstract
Metabolism. 2002 Jul;51(7):871-5.
Lung cancer associated with hypercalcemia induced by concurrently elevated parathyroid hormone and parathyroid hormone-related protein levels.
Uchimura K, Mokuno T, Nagasaka A, Hayakawa N, Kato T, Yamazaki N, Kobayashi T, Nagata M, Kotake M, Itoh M, Tsujimura T, Iwase K.
Division of Endocrinology and Metabolism, Department of Internal Medicine, Fujita Health University School of Medicine, Toyoake, Aichi, Japan.
In general, many cases of malignancy-associated hypercalcemia are due to HHM. In patients with humoral hypercalcemia of malignancy (HHM), it has been reported that plasma parathyroid hormone-related protein (PTHrP) and cyclic adenosine monophosphate (cAMP) levels were elevated, while plasma PTH and active vitamin D(3) levels were suppressed. Our patient showed hypercalcemia with a concurrent increase in plasma and tumor tissue PTHrP and PTH concentrations and also high cAMP and low 1-25(OH)(2)VD(3) levels in the plasma. These data suggest that the hypercalcemia exhibited by our patient was consistent with HHM due to lung cancer and its liver metastasis. Moreover, diagnostic imaging and autopsy findings showed no appreciable lesions of the parathyroid gland. In addition, histopathologic examination of the primary and metastatic tumors revealed the existence of PTH immunohistochemically stained with anti-PTH antibodies, suggesting an ectopic-PTH-producing lung tumor. From these data, our patient was diagnosed with a rare case of lung cancer, which produced both ectopic PTH and PTHrP. 2002, Elsevier Science (USA). All rights reserved.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12077733&dopt=Abstract
Bioorg Khim. 2002 May-Jun;28(3):220-35.
[NMR spectroscopy for studying structure and intramolecular dynamics of modified analogs of steroid hormones]
[Article in Russian]
Selivanov SI, Shavva AG.
Chemical Faculty, St. Petersburg State University, Universitetskii pr. 26, Staryi Petergof, St. Petersburg, 198504 Russia. nmaloma.spbu.ru
Special features of the use of homo- and heteronuclear correlation methods of NMR in one and two dimensions for studying the spatial structure and intramolecular dynamics of modified analogues of steroid hormones (MASH) are considered. The application of these methods to the assignment of resonances in the high-field 1H NMR region and to the determination of the most stereospecifically important parameters, such as the vicinal constants of spin-spin coupling (3JH-H) and nuclear Overhauser effects (NOE), are discussed using the example of NMR studies of some estrogens and androgens at 300 MHz and on the basis of literature data. The most efficient combination of the methods and the necessary modification of each of them may be chosen considering the spectral and relaxation parameters of MASH in liquid medium, including the anisotropy of the overall diffusive motion. The characteristics of MASH are the wide use of correlations through long-range couplings (COSY-45 and DQF-COSY), the application of the 4,5JH-H constants for the determination of spatial structure, and the advantage of heteronuclear HSQC methods with and without 13C decoupling over the corresponding HMQC methods in both resolution and sensitivity. In the conformationally rigid MASH molecules, the anisotropy of the MASH diffusive motion in liquid adversely affects the determination of interproton distances by the calibrating processing method for the NOE difference and NOESY spectra: it results in both overestimated and underestimated distance values depending on the polar angle ratios of the reference and the determined distances. Under certain conditions, conformationally mobile MASH demonstrate the additional contribution of the scalar relaxation mechanism between the indirectly (scalarly) bound protons. This mechanism is responsible for the underestimated values of NOE and the corresponding errors in the distance determination.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12077848&dopt=Abstract
The most ostensive feature that distinguishes us human from chimps and other primates is the lack of bodily hair. During evolutionary process, we have lost the majority of hair. Hair is no longer an essential part of our body, just like appendix. What little hair we still have on our scalp and a few other bodily parts is still regarded as significant for reasons other than biological necessity. Hair loss is naturally accompanied by aging process, although the extent of hair loss and the timing of onset vary widely among individuals. Thus, loss of hair and baldness is considered as a symbol of maturity or old age. Like winkles and other signs of aging, hair loss is not welcome by most people, because we don't welcome aging, and being perceived as an aging person. However, it is alopecia, or premature hair loss that especially concerns certain people.
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