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  • Articles  (14)
  • Life and Medical Sciences  (8)
  • Cortisol  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 51 (1973), S. 1025-1026 
    ISSN: 1432-1440
    Keywords: Cushing's syndrome ; hydrocortison ; circadian rhythm ; Cushing-Syndrom ; Cortisol ; Tagesrhythmus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Wiederholte ambulante Plasmacortisolbestimmungen bei einer Patientin mit deutlichen klinischen Zeichen des Hyperkortizismus ergaben mit 16–24 µg/100 ml normale Werte. Erst ein unter standardisierten Bedingungen erstelltes Plasmacortisol-Tagesprofil erbrachte den eindeutigen Nachweis der Hypercortisolämie. Im Vergleich zu gesunden Normalpersonen liegen die Plasmacortisolspiegel der Cushing-Patientin auf einer höheren Ebene. Die physiologischen Phasen ruhender Cortisolsekretion in den Abend- und Nachtstunden fehlen. Wie bei Gesunden können wir bei diesem Fall von Hypercortic ismus, beruhend auf bilateraler Nebennierenrinden-Hyperplasie, große Schwankungen des Plasmacortisolspiegels beobachten. Der Wert wiederholter Plasmacortisolbestimmungen in der Abklärung des Cushing-Syndroms wird diskutiert.
    Notes: Summary In a patient with typical features of Cushing's disease, repeated ambulant determinations of plasma cortisol showed normal values with 16 to 24 µg/100 ml. The entire analysis of the circadian variations of plasma cortisol under standardized conditions led to the diagnosis of hypercorticism. Compared with 2 healthy subjects the patient's curve is set at a higher level. Physiological, quiet periods of cortisol secretion in late day-time do not occur. In accord to the normal, we find great variations of plasma cortisol in this case of Cushing's syndrome due to bilateral adrenal hyperplasia. The diagnostic value of plasma cortisol determinations at short term intervals in differentiating the various forms of hypercorticism is discussed.
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  • 2
    ISSN: 1432-1440
    Keywords: Altern ; Renin ; Aldosteron ; Cortisol ; Katecholamine ; Austauschbares Natrium ; Blutvolumen ; Aging ; Plasma renin ; Plasma aldosterone ; Plasma cortisol ; Urinary catecholamines ; Blood volume ; Exchangeable sodium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Interrelations between age and plasma renin, aldosterone and cortisol levels, urinary catecholamines, plasma and blood volumes, exchangeable body sodium and blood pressure were studied in 28 young (19 to 29 years), 16 middle-aged (32 to 58 years) and 15 elderly (60 to 74 years) healthy subjects. Supine and upright plasma renin and supine aldosterone levels decreased while urinary noradrenaline excretion rate increased progressively with aging (r≥0.34;p〈0.05), with significant differences in mean values between young and elderly subjects (p〈0.02). There was also an age-related decrease in upright plasma aldosterone concentration, although this was not statistically significant. Furthermore, mean plasma cortisol concentrations increased in response to upright posture in elderly (+50%;p〈0.02), but not in young (−10%) or middle-aged (−8%) subjects. Blood pressure correlated with age (r=0.35;p〈0.05) or noradrenaline excretion rate (r=0.34) in the entire study population and with blood volume in the elderly (r=0.68), but not in the young or middle-aged study groups. There were no significant age-related differences in the body sodium/volume state, basal plasma cortisol levels or urinary adrenaline excretion rate, and plasma renin or aldosterone levels did not correlate with these parameters or with blood pressure. It is concluded that the influence of age on plasma renin or aldosterone levels, plasma cortisol responsiveness to upright posture, and urinary noradrenaline excretion should be taken into consideration, whenever these factors have to be interpreted in patients with arterial hypertension or other clinical disorders. Furthermore, these data are consistent with the possibility that in normal man increases in supine blood pressure with aging may be related at least partly to concomitant changes in free peripheral noradrenaline.
    Notes: Zusammenfassung Untersuchungen bei 28 jungen (19–29 Jahre), 16 mittel-alten (32–58 Jahre) und 15 älteren (60–74 Jahre) Normalpersonen zeigten eine mit zunehmendem Alter progressive Abnahme der Plasmareninaktivität und -aldosteronkonzentration sowie eine Zunahme der Noradrenalinexkretionsrate. Mit Ausnahme der im Stehen gemessen Plasmaaldosteronspiegel waren die Korrelationen dieser Parameter mit dem Alter (r≥0,34;p〈0.05) sowie die Unterschiede der Mittelwerte zwischen jungen und älteren Personen (p〈0,02) signifikant. Die Plasmacortisolkonzentration blieb beim Aufstehen bei jungen und mittel-alten Personen im Mittel unverändert (−10 und −8%), stieg jedoch bei älteren Menschen um 50% an (p〈0,02). Der Blutdruck korrelierte (p〈0,05) bei Analyse der gesamten Studienpopulation mit dem Alter (r=0,35) und der Noradrenalinexkretionsrate (r=0,34), bei den älteren Personen fand sich auch eine signifikante Beziehung zum Blutvolumen (r=0,68). Austauschbares Körpernatrium, Plasma- und Blutvolumina und Adrenalinexkretionsrate zeigten keine signifikanten altersbezogenen Variationen. Plasmarenin- und -aldosteronspiegel korrelierten weder mit diesen letzteren Parametern noch mit dem Blutdruck. Es wird gefolgert, daß der Einfluß des Alters auf Plasmarenin- und -aldosteronwerte, das freie periphere Noradrenalin und die Stimulierbarkeit von Plasmacortisol durch Orthostase in Betracht gezogen werden sollte, wenn immer diese Faktoren bei Patienten mit arterieller Hypertonie oder anderen klinischen Störungen interpretiert werden müssen. Diese Resultate sind außerdem mit der Möglichkeit vereinbar, daß die altersbezogene Zunahme des Liegendblutdrucks beim normalen Menschen zumindest teilweise auf dem parallelen Anstieg des freien peripheren Noradrenalins beruhen könnte.
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  • 3
    ISSN: 1432-1440
    Keywords: Aldosterone ; cortisol ; sodium ; potassium ; hemodialysis ; Aldosteron ; Cortisol ; Natrium ; Kalium ; Hämodialyse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Plasmaaldosteron, Plasmacortisol und die Serumkonzentrationen von Kalium und Natrium wurden bei 5 nierenlosen Patienten vor und in kurzen Zeitabständen bis zu 180 min nach Beendigung der Hämodialyse gemessen. Unter Hämodialyse stieg das Plasmaaldosteron bei 4 der 5 Patienten an, während bei allen Patienten Cortisol, Kalium und Natrium abfielen. Nur bei einem Patienten ließ sich unter Hämodialyse ein Abfall des Aldosterons nachweisen. Nach Beendigung der Hämodialyse kam es über den untersuchten Zeitraum bei 3 der 5 Patienten zu cinem fast kontinuierlichen Abfall des Plasmaaldosterons, während die beiden anderen Patienten Sekretionsepisoden des Aldosterons mit spontanen Anstiegen und anschließendem Abfall der Hormonkonzentration zeigten. Bei allen Patienten stieg nach Hämodialyse das Serumkalium rasch wieder an, während nur geringgradige Veränderungen des Serumnatriums nachweisbar waren. Plasmacortisol zeigte während der Beobachtungsperiode typische tageszeitliche Schwankungen. Wir nehmen an, daß ein noch unbekannter Faktor für den Anstieg des Plasmaaldosterons unter Hämodialyse verantwortlich ist. Einiges spricht dafür, daß über den nach Hämodialyse beobachteten Zeitraum die intracelluläre Kaliumkonzentration und nicht das Serumkalium die Aldosteronsekretion beeinflußt. Dies würde den bei 3 der 5 Patienten scheinbar paradoxen Abfall des Aldosterons bei steigendem Serumkalium erklären.
    Notes: Summary Plasma aldosterone, plasma cortisol and the serum concentrations of sodium and potassium were determined in 5 anephric patients before and at short time intervals up to 180 minutes after hemodialysis. Plasma aldosterone increased in 4 of 5 patients during hemodialysis while in all patients plasma cortisol, sodium and potassium decreased. Only one patient showed a fall in aldosterone during hemodialysis. After hemodialysis plasma aldosterone gradually decreased over a period of 3 hours in 3 of 5 patients, whereas the remaining two patients showed typical secretory episodes of aldosterone. In each patient serum potassium rapidly increased while serum sodium showed only minor variations. Plasma cortisol followed the normal circadian rhythm. We suggest that a still unknown factor had caused the observed increases in plasma aldosterone during hemodialysis. There are reasons to believe that over the period observed after hemodialysis the intracellular potassium concentration and not serum potassium levels has influenced adrenal aldosterone release. This would explain the paradoxical decrease in plasma aldosterone in 3 of the 5 patients while serum potassium increased.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 53 (1975), S. 955-959 
    ISSN: 1432-1440
    Keywords: Renin ; Aldosteron ; Cortisol ; Kalium ; Orthostase ; Renin ; aldosterone ; cortisol ; potassium ; orthostasis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Plasma aldosterone, plasma renin activity (PRA), plasma cortisol as parameter of ACTH activity and the serum concentrations of sodium and potassium were determined at short time intervals in 10 healthy students after an overnight bedrest and during three hours of ambulation. While PRA rose significantly within 15 minutes of orthostasis in all students, plasma aldosterone showed a similar rapid increase in some of the subjects only. These persons demonstrated also a simultaneous increase of serum potassium or of plasma cortisol. Plasma aldosterone rose not before 30 to 60 minutes after change to the upright position in subjects who showed neigher plasma cortisol nor serum potassium increases. It is concluded that the immediate rise of plasma aldosterone during orthostasis seems to depend on a stimulation by ACTH of by potassium. The main stimulus of plasma aldosterone during orthostasis appears to be the renin angiotensin system. If the aldosterone response to posture is mediated only through this system a delay of 30 to 60 minutes is observed.
    Notes: Zusammenfassung Plasma-Aldosteron, Plasma-Renin-Aktivität (PRA), Plasmacortisol (als Parameter der ACTH-Aktivität) und die Serumkonzentrationen von Natrium und Kalium wurden bei 10 gesunden Studenten nach Bettruhe und in kurzen Zeitabständen während drei Stunden nach dem Aufstehen gemessen. Während die PRA innerhalb von 15 min nach dem Aufstehen bei allen Studenten signifikant anstieg, wurde ein ähnlich schneller Anstieg des Plasmaaldosterons nur bei einigen der Probanden beobachtet. Nur bei diesen wurde ein gleichzeitiger Anstieg des Serumkaliums oder des Plasmacortisols beobachtet. Bei den Studenten, bei denen weder das Plasmacortisol noch das Serumkalium anstiegen, stieg das Plasmaaldosteron frühestens nach 30–60 min nach dem Aufstehen an. Aus den Ergebnissen wird geschlossen, daß der sofortige Anstieg des Plasmaaldosterons nach dem Aufstehen von einer Stimulation durch ACTH oder Kalium abzuhängen scheint. Der Hauptstimulus für das Aldosteron scheint während der Orthostase jedoch das Renin-Angiotensin-System zu sein. Wird Aldosteron nur über dieses System stimuliert, erfolgt der Aldosteronanstieg mit einer Verzögerung von 30–60 min.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 56 (1978), S. 229-234 
    ISSN: 1432-1440
    Keywords: Aldosteron ; Renin ; Cortisol ; Diabetes mellitus ; Hypoaldosteronismus ; Hyperkaliämie ; Aldosterone ; Renin ; Cortisol ; Diabetes ; Hypoaldosteronism ; Hyperkalemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In three patients with diabetes and hyporeninemic hypoaldosteronism changes in renin activity, plasma aldosterone and cortisol were examined under various conditions: orthostasis and intravenous furosemide, infusion of synthetic β1–24 ACTH on two consecutive days and diurnal variations in basal hormone fluctuations. Each patient showed unmeasurably low renin activity unresponsive to orthostasis and intravenous furosemide while plasma aldosterone was below normal range. Under ACTH-infusion only marked increases in aldosterone were observed in one patient whereas cortisol responded normally in all diabetics tested. Analysis of diurnal night day fluctuations (20.00–8.00) in plasma aldosterone and cortisol revealed a close and statistically significant relationship between both hormones in each of the three patients (p〈0.05–〈0.001). Variations in plasma aldosterone thus were mediated through changes in endogenous pituitary ACTH. Compared with normal controls however, diurnal aldosterone curves were set at a lower level. Our results demonstrate that a reduced sensitivity of the adrenal gland to ACTH is not responsible for the observed subnormal plasma aldosterone levels in these patients. Therefore, the lack of circulating angiotensin II seems to be the causative reason of hypoaldosteronism. The exact mechanism of undetectable renin activity in these patients remains unknown.
    Notes: Zusammenfassung Bei drei Patienten mit Diabetes mellitus und hyporeninämischem Hypoaldosteronismus wurden Veränderungen der Plasmareninaktivität, des Plasmaaldosteron- und Plasmacortisolspiegels unter folgenden Bedingungen geprüft: Orthostase und intravenöse Furosemidapplikation, Infusion von synthetischem β1–24 ACTH an zwei aufeinanderfolgenden Tagen, Tag-Nacht-Rhythmus der basalen Hormonplasmaspiegel. Alle Patienten zeigten eine nicht meßbare und durch Orthostase und Furosemid nicht stimulierbare Reninaktivität. Gleichzeitig wurden subnormale Aldosteronplasmakonzentrationen gemessen. Unter ACTH-Infusion zeigte nur ein Patient einen deutlichen Anstieg des Plasmaaldosterons, während das Plasmacortisol in allen drei Fällen normal stimulierbar war. Die statistische Analyse der Tag-Nacht-Schwankungen von Plasmaaldosteron und Plasmacortisol zeigte in jedem der Fälle eine enge und statistisch signifikante Beziehung zwischen beiden Hormonen (p〈0,05–〈0,001). Es ist somit anzunehmen, daß Schwankungen des Plasmaaldosterons durch Veränderungen der hypophysären ACTH-Ausschüttung verursacht wurden. Jedoch war im Vergleich zu Normalpersonen die Rhythmik des basalen Plasmaaldosterons auf einem tieferen Niveau eingestellt. Unsere Ergebnisse lassen den Schluß zu, daß bei diesen Patienten nicht eine verminderte Sensitivität der Nebennierenrinde auf ACTH für die beobachteten subnormalen Aldosteronspiegel verantwortlich ist. Ursache für den Hypoaldosteronismus scheint somit der Mangel an zirkulierendem Angiotensin II zu sein. Der genaue Mechanismus der nicht meßbaren Reninaktivität bei diesem Patienten bleibt unbekannt.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Der Anaesthesist 46 (1997), S. 850-855 
    ISSN: 1432-055X
    Keywords: Schlüsselwörter Prämedikation ; Midazolam ; Adrenalin ; Kortisol ; Kinder ; Key words Premedication ; Midazolam ; Epinephrine ; Cortisol ; Child
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Anxiolysis with drugs and psychoprophylaxis are both recognised methods of preoperative preparation. The beneficial effects of anxiolytics, however, appear to be difficult to prove. In this study a comparison was made of heart rate (HR), blood pressure (BP), and norepinephrine, epinephrine, and cortisol levels. In group I 19 children recieved only psychological treatment, while in group II 21 children received 0.2 mg/kg midazolam orally. Measuring points were directly before medication, 30 min afterward, and at induction of anaesthesia. During the observation period the patients (5–10 years old) remained calm. At the beginning of the study the parameters of all patients were within a normal range; 30 min after premedication the HR and BP were significantly higher in group I than in group II. In contrast to group I, epinephrine levels in group II were lower at the beginning of anaesthesia than before premedication. In both groups, norepinephrine levels were the same at induction of anaesthesia as before premedication. Cortisol decreased only in patients who received midazolam. HR, BP, as well as humoral stress parameters indicate that midazolam in a dose of 0.2 mg/kg orally is sufficient to reduce preoperative stress in children.
    Notes: Zusammenfassung Sowohl Anxiolyse mit Medikamenten als auch psychische Führung sind anerkannte Methoden der präoperativen Vorbereitung. Ein Vorteil von Anxiolytika ist aber für Kinder schwer zu beweisen. Material und Methoden. In dieser Untersuchung wurden Herzfrequenz, Blutdruck, Noradrenalin, Adrenalin und Kortisol als Streßindikatoren zum Vergleich gewählt. Wir betreuten 19 Kinder in Gruppe I psychisch, 21 Kinder der Gruppe II erhielten Midazolam oral (0,2 mg/kg) zur Prämedikation. Die Meßpunkte lagen unmittelbar vor und 30 min nach Prämedikation sowie zu Narkosebeginn. Ergebnisse. Im Beobachtungszeitraum wirkten alle Kinder unauffällig mit vergleichbaren Ausgangswerten. 30 min nach psychischer Führung hatte diese Gruppe signifikant höhere Herzfrequenzen als die Vergleichsgruppe. Analog dazu zeigte sich der Blutdruck. Im Gegensatz zu Gruppe I blieben die Adrenalinspiegel in Gruppe II auch zur Narkoseeinleitung unter den Ausgangswerten. Die Noradrenalinspiegel glichen zu Narkosebeginn in beiden Gruppen der Ausgangssituation. Nur in der Midazolamgruppe blieb Kortisol bis zum Narkosebeginn unter den Ausgangswerten. Schlußfolgerungen. Herzfrequenz und Blutdruck sowie humorale Streßparameter zeigen, daß Midazolam in einer Dosierung von 0,2 mg/kg zu einer Streßreduktion bei Kindern führt.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 144 (1990), S. 115-121 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Alkaline phosphatase, long implicated in biomineralization, is a feature of the osteoblast phenotype. Yet in cultured bone cells, only a fraction stain positive histochemically. To determine whether osteoblast enzyme expression reflects cellular heterogeneity with respect to cell cycle distribution or length of time in culture, the activities of alkaline phosphatase, tartrate-resistant and -sensitive acid phosphatases, and non-specific esterases were assayed kinetically and histo-chemically. In asynchronous subconfluent cultures, 〈 15% of the cells stained positive and assayed activity was 0.04 IU/106 cells/cm2. After 1 week, the percent of alkaline phosphatase positive-staining cells increased 5-fold, while activity increased 10-fold. Non-specific esterases and tartrate-sensitive acid phosphatase were constitutive throughout time in culture, whereas tartrate-resistant acid phos-phatase activity appeared after 2 weeks. Cell cycle analysis of human bone cells revealed a growth fraction of 80%, an S phase of 8.5 h, G2 + 1/2 M of 4 h, and a G1 of 25-30 h. In synchronous cultures induced by a thymidine-aphidicolin protocol, alkaline phosphatase activity dropped precipitously at M phase and returned during G1. A majority of the alkaline phosphatase activity lost from the cell surface at mitosis was recovered in the medium. Tartrate-sensitive acid phos-phatase and non-specific esterase levels were relatively stable throughout the cell cycle, while tartrate-resistant acid phosphatase activity was not assavable at the density used in synchronous cultures. From these data, variations in alkaline phosphatase activity appear to reflect the distribution of cells throughout the cell cycle.
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  • 8
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A morphological and histochemical investigation was conducted on the pronephros and mesonephros of the mouse embryo from 8.5 through 16.5 days. The pronephros appeared between days 8.5 and 9.5 as a thickening of the somatic layer of the intermediate cell mass. It consisted of three small clusters of cells on either side of the midline dorsally between the somite and the coelom, at the level of somites 8 and 9. The mesonephros arose during day 9 and persisted until day 16. In the male the anterior three tubules were incorporated into the testis at 15.5-16.5 days. The mesonephros consisted of approximately 11 tubules located between somites 10-17. The tubules possessed lumina and connected with the Wolffian duct. Indications of internal and external glomeruli were noted on day 11. The Wolffian duct reached the cloaca at ten days.Strong alkaline phosphatase activity was noted in the differentiating tubules. Cytoplasmic and luminal enzyme activity was observed between 9.3 and 12.5 days indicating possible function at this time. Acid phosphatase was demonstrable in the tubules and duct only on day 11. Ribonucleic acid was observed in the nuclei and cytoplasm of the mesodermal cells as they differentiated into tubules and duct. A decrease in RNA was noted after differentiation was complete. Periodic acid-Schiff material (diastase-stable) was localized in the basement membrane of the tubule and duct cells. A faint positive reaction was also found at the luminal border of the tubules. The strongest reaction was noted in the luminal border at 11.5-12.5 days. Those tubules being incorporated into the genital system in the male were also PAS positive. Morphological and histochemical evidence suggested that the mouse mesonephros, though quasi vestigial, may function for a short time.
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  • 9
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: We studied the expression of osteoblastic markers in cultured cells isolated from the bone of 15 patients with different clinical forms of osteogenesis imperfecta (OI) and of seven fetal and postnatal controls. Cultured bone cells of ten OI patients produced abnormal collagen type I. Similar to controls, OI bone cells produced predominantly collagen type I with traces of collagen types III and V. The 1,25(OH)2 vitamin D3-stimulated synthesis of osteocalcin, a specific osteoblastic marker protein, was similar in OI bone cells and age-matched controls. Bone cells from fetal controls and from patients with the perinatal lethal OI type II produced less osteocalcin than bone cells from postnatal controls and surviving OI patients. OI bone cells responded to parath.yroid hormone (PTH) by increased production of cAMP similar to controls. Bone cells from fetal controls and from OI type II donors showed a decreased response to PTH. Activity of the bone-liver-kidney isoenzyme alkaline phosphatase (AP) was detected in all control and OI bone cells. The expression of all osteoblastic markers was similar in bone cells producing abnormal collagen type I. These observations show that OI bone cells in vitro express a pattern of osteoblastic markers similar to age-matched control bone cells indicating that osteoblastic differentiation is not altered by the underlying defects of collagen type I metabolism in OI bone cells. © 1993 Wiley-Liss, Inc.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 151 (1992), S. 215-227 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Human bone cells grown in culture, representative of a preosteoblastic stage of maturation, produce an extracellular matrix composed of collagen several noncollagenous glycoproteins, hyaluronan, and four distinct proteoglycans (PGs). The influence of donor age on the levels of expression of these molecules in vitro has not been well characterized. In this study, human bone cells derived from sources ranging from fetal to 60-year-old donors were grown in culture, radiolabeled for 24 h, and the amount of incorporation of [35S]sulfate into PGs, [3H]glucosamine into hyaluronan, [3H]leucine/proline into osteonectin, and [3H]proline into collagen was determined. Cell proliferation was most rapid in fetal-derived bone cells and decreased with increasing age. Total protein and PG synthesis also decreased with increasing age, falling to 1/3 and 1/4, respectively, of fetal levels after age 30. A large chondroitin sulfate PG (Mr ∼ 600,000 Da) was the major fetal PG and its levels were highly correlated with cellular proliferation. [3H]Collagen and [35S]decorin levels increased with the increasing age of the donor, reached a maximum in puberty-derived cells, and decreased to 1/3 maximal levels after age 20. The heparan sulfate PG (Mr ∼ 400,000 Da) exhibited steadystate levels regardless of donor age. [3H]Osteonectin and [35S]biglycan levels were high in fetal-derived cells and in cells derived from pubescent donors. The percentage of collagen and four proteoglycans associated with the cell layer pool changed with donor age. All fetal-derived PG core proteins possessed more N- and O-linked oligosaccharides than newborn or adult derived PGs. © 1992 Wiley-Liss, Inc.
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