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Secretory territories and rate of matrix production of osteoblasts

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Abstract

The secretory territories of rat osteoblasts on the parietal bone were measured directly using scanning electron microscopy. The mean territory of 4620 cells in 19 fields was 154 μm2 per osteoblast. The range for the fields was 136 to 177 μm2 per osteoblast. Four hundred cells were measured individually—for these the mean value per osteoblast was 143 μm2 with a standard deviation of 33. The daily rate of apposition over an 8 day period was 3.12 μm (standard deviation 0.22) measured by tetracycline marking of the mineral front. This gave a daily matrix production rate of approximately 470 μm3 per osteoblast.

Résumé

Les territoires sécrétoires des ostéoblastes d'os pariétal de rats sont déterminées en utilisant la microscopie électronique à balayage. Le territoire moyen de 4.620 cellules, dans 19 territoires, est de 154 μm2 par ostéoblaste. Les valeurs extrêmes par champ varient de 136 à 177 μm2 par ostéoblaste. Quatre cent cellules sont mesurées individuellement; la valeur moyenne par ostéoblaste est de 143 μm3 avec une déviation standard de 33. Le taux d'apposition journalier, mesuré par la tétracycline pendant 8 jours, est de 3.12 μm (déviation standard 0.22). Ce qui correspond à une production matricielle journalière d'environ 470 μm3 par ostéoblaste.

Zusammenfassung

Die Ausscheidungsbereiche von Ratten-Osteoblasten des Scheitelbeines wurden mit dem Raster-Elektronenmikroskop direkt gemessen. Der durchschnittliche Bereich von 4620 Zellen in 19 Gesichtsfeldern war 154 μm2 per osteoblast. Der Streubereich lag in den verschiedenen Gesichtsfeldern zwischen 136 und 177 μm2 per Osteoblast. 400 Zellen wurden einzeln gemessen. Bei diesen war der Durchschnittswert per Osteoblast 143 μm2, mit einer Standard-Abweichung von 33. Die tägliche Anlagerungsrate während einer Periode von 8 Tagen war 3,12 μm (Standard-Abweichung 0,22); sie wurde mittels Tetracyclinmarkierung der Mineralisierungsfront gemessen. Dies ergab eine tägliche Produktionsrate der Matrix von etwa 470 μm3 per Osteoblast.

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Jones, S.J. Secretory territories and rate of matrix production of osteoblasts. Calc. Tis Res. 14, 309–315 (1974). https://doi.org/10.1007/BF02060305

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  • DOI: https://doi.org/10.1007/BF02060305

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