Abstract
Matrix morphogenesis requires the synthesis, assembly and deposition of collagen molecules in a tissue specific manner. Collagen fibrillogenesis is a multistep process involving both intracellular and extracellular assembly reactions. Collagen synthesis, molecular assembly and formation of supramolecular aggregates occurs within a series of well defined cytoplasmic compartments while the assembly and deposition of the newly synthesized collagen fibrils, fibril bundles and tissue specific collagen macroaggregates occurs within a series of extracellular compartments defined by the fibroblast.In the studies described here we will focus our attention on the cellular influences involved in the assembly of collagen molecules into fibrils, fibril bundles and tissue specific macroaggregates. The chick tendon and corneal fibroblasts partition the extracellular space during morphogenesis, forming at least three compartments. These extracytoplasmic compartments have been described using high voltage electron microscopy of thick sections and serial thick sections as well as by conventional transmission electron microscopy.
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