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Physiol Res. 2000;49(4):435-9.
Bone mineral density in patients with apolipoprotein E type 2/2 and 4/4 genotype.

Stulc T, Ceska R, Horinek A, Stepan J.

Third Department of Internal Medicine, First Faculty of Medicine, Charles University, Prague, Czech Republic. tstulfl.cuni.cz

The peak bone mass and the rate of bone loss are in part genetically determined. It has been suggested that bone mineral density (BMD) may be related to allelic variation in the apolipoprotein E (ApoE) gene locus. ApoE is important in the receptor-mediated clearance of chylomicron particles from the plasma, Apo E4 having the highest and Apo E2 the lowest receptor affinity. Chylomicrons are the main carrier of vitamin K in the plasma; vitamin K plays an important role in the carboxylation of osteocalcin. We have tested the hypothesis that persons with E4 variant would have lower BMD and increased bone turnover than those with E2 variant. A total of 18 ApoE 2/2 and ApoE 4/4 homozygotes were selected from 873 patients who were examined for the ApoE genotype. BMD in lumbar vertebral, femoral neck and distal forearm was measured and plasma concentrations of osteocalcin and C-terminal fragments of collagen (CTx) were determined. BMD values (expressed as T-score) at the three specified sites were -0.12+/-1.72, -0.52+/-1.32 and -0.52+/-0.81 in ApoE 2/2 group and -0.24+/-1.22, 0.00+/-0.84 and -0.17+/-1.07 in the ApoE 4/4 group. Plasma osteocalcin and CTx were within normal limits in both groups. In conclusion, we did not observe any association of ApoE genotype with BMD and biochemical markers of bone metabolism in ApoE 2/2 and ApoE 4/4 homozygotes.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11072803&dopt=Abstract

Arch Histol Cytol. 2000 Oct;63(4):327-43.
Muscular innervation of the proximal duodenum of the guinea pig.

Iino S.

Department of Anatomy, Fukui Medical University, Matsuoka, Japan. iinosmsrsa.fukui-med.ac.jp

We investigated the muscular structure and innervation of the gastroduodenal junction in the guinea pig. In the gastroduodenal junction, the innermost layer of the circular muscle contained numerous nerve fibers and terminals. Since this nerve network continued onto the deep muscular plexus (DMP) of the duodenum, we surmised that the numerous nerve fibers in the gastroduodenal junction were specialized DMP in the most proximal part of the duodenum. The innermost layer containing many nerve fibers was about 1,000 microm in length and 100 microm in thickness in the proximal duodenum. This layer contained numerous connective tissue fibers composed of collagen and elastic fibers. Five to 30 smooth muscle cells lay in contact with each other and were surrounded by fine connective tissue. The nerve fibers in the proximal duodenum contained nerve terminals immunoreactive for choline acetyltransferase, dynorphin, enkephalin, galanin, gastrin-releasing peptide, nitric oxide synthase, substance P, and vasoactive intestinal polypeptide. Adrenergic fibers which contained tyrosine hydroxylase immunoreactivity were rare in the proximal duodenum. In the innermost layer of the proximal duodenum, there were numerous c-Kit immunopositive cells that were in contact with nerve terminals. This study allowed us to clarify the specific architecture of the most proximal portion of the duodenum. The functional significance of the proximal duodenum in relation to the electrical connection and neural cooperation of the musculature between the antrum and the duodenum is also discussed.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11073065&dopt=Abstract

Arch Histol Cytol. 2000 Oct;63(4):345-55.
Ultrastructure and distribution of interstitial glandular cells and associated elements in human fetal ovaries.

Nottola SA, Makabe S, Stallone T, Macchiarelli G, Correr S, Motta PM.

Department of Anatomy, University of Rome La Sapienza, Italy. pietro.mottniromal.it

In order to understand the fine structure and distribution of the interstitial glandular cells (IGCs) and associated elements in the human fetal ovary, we studied human fetal ovaries at 16 weeks post fertilization (p. f.) by transmission electron microscopy. Semithin sections revealed voluminous typical IGCs usually grouped in clusters, located in the interstitium among the ovigerous cords. Isolated primordial follicles were seen in the cords located close to the interstitium in which IGCs were present. Besides the main ultrastructural characteristics of steroid secreting cells, the IGCs showed lipofuscin granules and stacks of annulate lamellae in their cytoplasm. Fibrocytes, macrophages and mast cells were detected close to the IGCs. In particular, the fibrocytes were located around the IGCs, with which they occasionally formed focal cell contacts. Fibrocytes issued numerous long projections, which, together with collagen fibers, surrounded the clusters of IGCs and small vessels (mainly capillaries), often extending into the intercellular spaces among IGCs. These data indicated that, already at the initiation of folliculogenesis, the IGCs are present numerously in a close association with the ovigerous cords. The morphological aspects of IGCs were comparable to that of fetal testis interstitial (Leydig) cells and hilar cells in adult ovary, and suggest that fetal IGCs may be source of adult ovary hilar cells. In addition, we have here demonstrated for the first time that IGCs are associated with stromal cells whose distribution seems to support IGCs microtopography. Fetal ovarian fibrocytes revealed a structural arrangement similar to that of the "compartmentalizing cells" previously described in the adult testis. Macrophages and mast cells presumably have a role as local modulators of steroid synthesis. Mast cells may also affect fibrocyte organization and vascular permeability. We thus suggest that IGCs and associated cells may form a glandular unit in the human fetal ovary similar to that in the adult testis, and this structure is likely involved in early steroid secretion during gonadal differentiation.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11073066&dopt=Abstract

Arch Histol Cytol. 2000 Oct;63(4):397-400.
Orcein-picroindigocarmine--a new multiple stain.

Steven P, Paulsen F, Tillmann B.

Department of Anatomy, Christian Albrecht University, Kiel, Germany. pstevemx.de

A new "orcein-picroindigocarmine staining", a colour combination of orcein, indigo carmine, and picric acid, was developed for histological applications. The new technique was tested on different human tissues. Colours ranging from red to brown, yellow, green and blue were observed in paraffine sections of tissues stained by this method. Nuclear structures in all tissues were stained dark brown to dark blue. Squamous epithelium was stained light brown with varying shades of blue in upper horny layers, whereas the ciliated epithelium was tinged blue grey. When connective tissue was stained, collagen fibrils appeared strongly blue next to elastic fibres, which took on a rust brown tinge; cellular components were all coloured brown. The matrix of hyaline cartilage was stained in different shades of blue, with the chondrocytes rust brown. Sections of bone components appeared dark blue to dark green. Skeletal muscle cells were coloured yellow and green with blue collagenous septa. The new staining is useful for distinguishing connective tissue components such as elastic fibres and collagen fibrils. It also demonstrates chondrocytes in favourable contrast to the cartilage matrix. The technique produces aesthetic staining colouring that could supplement histological investigations and provide an alternative to other staining materials.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11073070&dopt=Abstract

Eur Arch Otorhinolaryngol. 2000;257(8):425-9.
Induction of matrix metalloproteinases in keratinocytes by cholesteatoma debris and granulation tissue extracts.

Schmidt M, Grunsfelder P, Hoppe F.

University of Wuerzburg, Department of Otorhinolaryngology, Germany. marianne.schmidail.uni-wuerzburg.de

Although it is generally accepted that destruction and remodeling of temporal bone associated with middle ear cholesteatoma is mainly caused by the action of osteoclasts, it has been shown that neutral collagenases also play a role in predigesting the osteoid layer and exposing the mineralized bone to osteoclastic activity. Here we show that gelatinase B (matrix metalloproteinase-9) is over-expressed in cholesteatoma compared to external ear canal skin (EACS). Expression of MMP-9 in cholesteatoma mainly occurs in suprabasal layers, and more rarely in basal layers of cholesteatoma epithelium, as well as in inflammatory cells of the perimatrix. We further analyzed the influence of cholesteatoma debris, cholesteatoma granulation tissue, and cholesteatoma components such as keratin, cholesterol and bacterial endotoxin on the expression of MMPs in EACS keratinocytes. We show that cholesteatoma debris and granulation tissue extract both induced the secretion of MMP-9 by EACS keratinocytes, while keratin. bacterial lipopolysaccharide (LPS) or cholesterol did not show any effect. We further performed co-incubation and immunoprecipitation experiments using neutralizing interleukin-1alpha, EGF, TGF-beta, TGF-alpha, interleukin-6 and TNF-alpha antibodies. Inhibition of MMP-9 up-regulation by debris or granulation tissue extract could be revealed with diverse cytokine antibodies. The results are discussed with regard to previously published studies.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11073191&dopt=Abstract

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