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J Bone Joint Surg Br. 2000 Sep;82(7):1059-64.
The influence of avascularity on the mechanical properties of human bone-patellar-tendon-bone grafts.

Rupp S, Seil R, Kohn D, Muller B.

Department of Orthopaedic Surgery, University of Saarland, Homburg/Saar, Germany.

Our aim was to analyse the effect of avascularity on the morphology and mechanical properties (tensile strength, viscoelasticity) of human bone-patellar-tendon-bone (BPTB) grafts in vitro. These were harvested at postmortem and stored submerged in denaturated human plasma at a constant pH, pO2, pCO2, temperature and humidity under sterile conditions. Mechanical testing was performed two and four weeks after removal of the graft. The mean ultimate strength was 1085.7 +/- 255.8 N (control), 1009.0 +/- 314.9 N (two weeks cultured) and 1076.8 +/- 414.8 N (four weeks cultured). There was no significant difference in linear stiffness or deformation to failure between the groups. There was a difference in viscoelasticity between the control group and the avascular grafts and the latter had significant lower peak load-to-load ratios after 15 minutes compared with the control group. After two and four weeks the graft contained viable fibroblasts. There was regular cellularity in the superficial layers and decreased cellularity in the midportion. The structure of the collagen including the crimp pattern appeared to be normal in polarised light. We conclude that avascularity does not significantly affect ultimate failure loads or stiffness of BPTB grafts. Slight changes in viscoelasticity were induced, but the significance of the increased stress relaxation is not fully understood.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11041602&dopt=Abstract

Gen Comp Endocrinol. 2000 Oct;120(1):2-7.
Adrenocortical function in a new world primate, the marmoset monkey, Callithrix jacchus.

Whitehouse BJ, Abayasekara DR.

Endocrinology and Reproduction Research Group, King's College London, Guy's Campus, London, SE1 1UL.

The function of the adrenal cortex of the marmoset monkey Callithrix jacchus has been investigated. In common with other New World primates, these animals seem to be glucocorticoid resistant. Blood and adrenal glands were obtained from male and female animals under terminal pentobarbitone anesthesia. Dispersed adrenal cell preparations were obtained by treatment with collagenase and incubated with ACTH(1-24), (0.1-1000 nM) angiotensin II (0.1-1000 nM), dibutyryl cyclic AMP (dbcAMP; 30-1000 microM), and forskolin (FSK; 1-30 microM). Plasma cortisol levels (2113 +/- 449 ng/ml male; 3858 +/- 429 ng/ml female) were found to be 10- to 20-fold higher than those quoted for Old World primates and man. The cell preparations showed no significant response to any dose of ACTH tested (0.1-1000 nM), although addition of exogenous precursor (22R-hydroxycholesterol, 2.5 microM) resulted in an increased yield of cortisol and aldosterone. Cyclic AMP production was increased in response to forskolin (1-30 microM) but not ACTH(1-24) (1-1000 nM). In addition, dose-related responses to angiotensin II (maximal stimulation of 316 +/- 49% basal aldosterone at 100 nM angiotensin II), dbcAMP (maximal stimulation of 449 +/- 24% basal cortisol at 300 microM dbcAMP), and forskolin (maximal stimulation of 394 +/- 31% basal cortisol at 10 microM FSK) were obtained. The lack of a response in vitro to ACTH in C. jacchus cannot, therefore, be attributed either to general failure of the cells or to defects in postreceptor signaling mechanisms. The results suggest that there is a reduction in adrenal ACTH receptor number or affinity, with a high basal production rate in vivo maintaining the elevated plasma cortisol levels. 2000 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11042005&dopt=Abstract

Eur J Pharmacol. 2002 Nov 22;455(1):53-7.
Genistein, an isoflavone included in soy, inhibits thrombotic vessel occlusion in the mouse femoral artery and in vitro platelet aggregation.

Kondo K, Suzuki Y, Ikeda Y, Umemura K.

Department of Pharmacology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu 431-3192, Shizuoka, Japan. k17kondama-med.ac.jp

Diet can be the most important factor that influences risks for cardiovascular diseases. Genistein included in soy is one candidate that may benefit the cardiovascular system. Here, we investigated the inhibitory effects of genistein on thrombotic vessel occlusion in the mouse femoral artery using a photochemical reaction, and in vitro platelet aggregation in whole blood measured by single platelet counting. Genistein (10 mg/kg), intravenously administered 10 min before the rose bengal injection, significantly prolonged the thrombotic occlusion time from 6.1+/-0.4 to 8.4+/-0.8 min (P<0.05). Genistein at doses higher than 30 microM significantly (P<0.01) inhibited in vitro platelet aggregation induced by collagen (1 and 3 microg/ml). When 10 mg/kg genistein was intravenously administered, ex vivo platelet aggregation induced by collagen (1 and 3 microg/ml) was significantly suppressed (P<0.01). In conclusion, genistein prevented in vivo thrombogenesis and suppressed in vitro platelet aggregation. These results suggest that dietary supplementation of soy may prevent the progression of thrombosis and atherosclerosis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12433594&dopt=Abstract

Blood Cells Mol Dis. 2000 Aug;26(4):291-302.
Tissue- and epitope-specific mechanisms account for the diverse effects of anti-CD44 antibodies on the maintenance of primitive hematopoietic progenitors in vitro.

Muller-Sieburg CE, Deryugina E, Khaldoyanidi S, O'Rourke A.

Sidney Kimmel Cancer Center, San Diego, California 92121, USA. cmullekcc.org

The identification of rare stromal cells that support high levels of stem cells has opened avenues to identify molecules that contribute to the maintenance of these cells. We show that the maintenance of long-term culture initiating cells (LTC-IC) in stromal cell-supported cultures can be modulated via mAbs specific for CD44. mAb IM7.8.1 suppressed while mAb RAMBM44 enhanced LTC-IC levels in culture. Genetic polymorphisms in CD44 were used to show that the stromal cell compartment is targeted by mAb RAMBM44 and the hematopoietic compartment by mAb IM7.8. Neither of the CD44-specific mAbs inhibited adhesion of LTC-IC to the stroma, suggesting alternative mechanisms of action. In support of this interpretation, we show that mAb RAMBM44 directly induces signal transduction in the stromal cell line S17 but not in hematopoietic cells. Conversely, mAb IM7.8 elicited the appearance of phosphorylated bands in hematopoietic cells, but not in stromal cells. Collectively, the data indicate that the opposing effects of CD44-mediated regulation can be explained by different cellular programs that are elicited in distinct cell compartments. The binding of the enhancing mAb RAMBM44 to CD44 is specifically inhibited by collagen IV, while binding of the suppressive mAb IM7.8.1 is inhibited by a substance contained in the supernatant of the stromal cell line AC3.U. Thus, the CD44 epitopes defined by the mAbs bind distinct ligands and the ligands provide a potential physiological counterpart for the regulatory actions of the mAbs. 2000 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11042030&dopt=Abstract

J Biol Chem. 2001 Jan 12;276(2):1594-601.
Properties of the collagen type XVII ectodomain. Evidence for n- to c-terminal triple helix folding.

Areida SK, Reinhardt DP, Muller PK, Fietzek PP, Kowitz J, Marinkovich MP, Notbohm H.

Medizinische Universitat zu Lubeck, Institut fur Medizinische Molekularbiologie, Ratzeburger Allee 160, D-23538 Lubeck, Germany.

Collagen XVII is a transmembrane component of hemidesmosomal cells with important functions in epithelial-basement membrane interactions. Here we report on properties of the extracellular ectodomain of collagen XVII, which harbors multiple collagenous stretches. We have recombinantly produced subdomains of the collagen XVII ectodomain in a mammalian expression system. rColXVII-A spans the entire ectodomain from deltaNC16a to NC1, rColXVII-B is similar but lacks the NC1 domain, a small N-terminal polypeptide rColXVII-C encompasses domains deltaNC16a to C15, and a small C-terminal polypeptide rColXVII-D comprises domains NC6 to NC1. Amino acid analysis of rColXVII-A and -C demonstrated prolyl and lysyl hydroxylation with ratios for hydroxyproline/proline of 0.4 and for hydroxylysine/lysine of 0.5. A small proportion of the hydroxylysyl residues in rColXVII-C ( approximately 3.3%) was glycosylated. Limited pepsin and trypsin degradation assays and analyses of circular dichroism spectra clearly demonstrated a triple-helical conformation for rColXVII-A, -B, and -C, whereas the C-terminal rColXVII-D did not adopt a triple-helical fold. These results were further substantiated by electron microscope analyses, which revealed extended molecules for rColXVII-A and -C, whereas rColXVII-D appeared globular. Thermal denaturation experiments revealed melting temperatures of 41 degrees C (rColXVII-A), 39 degrees C (rColXVII-B), and 35 degrees C (rColXVII-C). In summary, our data suggest that triple helix formation in the ectodomain of ColXVII occurs with an N- to C-terminal directionality.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11042218&dopt=Abstract

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