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The neuropeptide head activator stimulates cell proliferation of neuronal precursor and neuroendocrine cells. The mitogenic signaling cascade requires Ca(2+) influx for which, as we show in this paper, the growth-factor-regulated Ca(2+)-permeable cation channel, GRC, is responsible. GRC is a member of the transient receptor potential channel family. In(More)
  • Thomasholstein, Chica H Schaller, Charlesn David, H C Schaller, H Bodenmiiller
  • 1985
Endogenous signals controlling nerve cell commitment in hydra were investigated using an assay for committed nerve precursors. Extracts of hydra tissue were prepared and tested for their ability to induce nerve cell commitment. The active component in such extracts was identified as a neuropeptide, the head activator [ based on its chromatographic(More)
We investigated insulin lispro kinetics with bolus and continuous subcutaneous insulin infusion (CSII) modes of insulin delivery. Seven subjects with type-1 diabetes treated by CSII with insulin lispro have been studied during prandial and postprandial conditions over 12 hours. Eleven alternative models of insulin kinetics have been proposed implementing a(More)
Apoptosis occurs in the normal liver and in various forms of liver disease. The CD95 (APO-1/Fas) (CD95) receptor mediates apoptosis, and liver cells in animal models are acutely sensitive to apoptosis initiated by this receptor. We have used primary human hepatocytes as a model system to investigate CD95-mediated apoptotic liver damage. Treatment of fresh(More)
P19 embryonal carcinoma cells differentiate into neuroectodermal derivates upon aggregation and treatment with retinoic acid (RA). Such RA-induced P19 cells, concomitant with neuronal differentiation, produce the neuropeptide head activator (HA) and release HA into the culture medium. The amount of HA produced by such differentiating P19 cells is more than(More)
We have developed an assay for a substance from hydra that accelerates foot regeneration in the animal. This substance is specific for the foot as evidenced by the following findings: (1) It is present in the animal as a steep gradient descending from foot to head, paralleling the foot-forming potential of the tissue (2) It does not accelerate head(More)
In NH15-CA2 cells head activator (HA) stimulates cell proliferation by acting in the G2/M transition. Cells in mitosis were analyzed by flow cytometry 2-4 h after HA application. HA in a dose-dependent manner stimulated mitosis. Mitosis was prevented by preincubation of cells with pertussis toxin identifying the HA receptor as being Gi-protein coupled. As(More)
Interleukin-6 (IL-6) is a proinflammatory cytokine whose synthesis is induced by a variety of stimuli including interleukin-1 (IL-1), substance P (SP), and histamine. Because IL-6 has been implicated in the etiopathology of different human diseases including multiple myeloma, rheumatoid arthritis, multiple sclerosis, acquired immunodeficiency syndrome(More)