Ice-cell interactions especially the question whether and how ice crystals invade tissues and organs during freezing were examined in small transparent organs (salivary glands) in which many structural details remained visible despite of freeze-induced cell darkening. In most glands no invasion of ice into the lumen was observed since ice dendrites stopped growing after touching the gland. Here I report that in rare cases a so far unknown type of ice crystals developed which aggressively pushed against cell membranes before invading the gland via paracellular pathways (septate junctions). Aggressive ice crystals were also observed within a salivary gland cell which deformed and finally invaded the nucleus. In cell strands it was observed that intracellular freezing is indeed a two-step event in which ice developed in cytoplasm several seconds before invading the nucleus.
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ICE CRYSTAL GROWTH;
Document Type: Research Article
February 1, 2004
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CryoLetters is a bimonthly international journal for low temperature sciences, including cryobiology, cryopreservation or vitrification of cells and tissues, chemical and physical aspects of freezing and drying, and studies involving ecology of cold environments, and cold adaptation
The journal publishes original research reports, authoritative reviews, technical developments and commissioned book reviews of studies of the effects produced by low temperatures on a wide variety of scientific and technical processes, or those involving low temperature techniques in the investigation of physical, chemical, biological and ecological problems.