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- Alston-Smith, J, et al.
(författare)
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Endotoxin, epinephrine, glucagon, insulin and calcium ionophore A23187 modulation of pyruvate kinase activity in cultured rat hepatocytes
- 1990
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Ingår i: Acta chirurgica Scandinavica. - : Taylor & Francis. ; 156:10, s. 677-681, s. 677-681
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Tidskriftsartikel (refereegranskat)abstract
- Altered glucose metabolism is one of the commonly observed sequelae of sepsis and septic shock. The present investigation was undertaken to determine the role of endotoxin (ET) upon hepatocyte glucoregulation, by measuring the activity of pyruvate kinase (PK), a key glycolytic enzyme. Hepatocytes were exposed to endotoxin concentrations known to occur in vivo during sepsis, i.e., from 1 X 10(-14) to 1 X 10(-8) g/ml. The alteration of the enzyme activities after addition of epinephrine, glucagon, insulin and calcium ionophore A23187 with and without ET preincubation were also examined. ET alone decreased the PK activity by 12% at all concentrations tested. The basal inhibition of the enzyme caused by epinephrine (-48%) was partially blocked by ET preincubation above 1 X 10(-10) g/ml. There were no ET-(glucagon, calcium ionophore, insulin) interaction. These in vitro results do not support pyruvate kinase as a site of hepatic enzyme regulation defect in endotoxaemia.
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| 2. |
- Wang, L, et al.
(författare)
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Protein gene product 9.5-immunoreactive nerve fibres and cells in human skin
- 1990
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Ingår i: Cell and Tissue Research. - : Springer. - 0302-766X .- 1432-0878. ; 261:1, s. 25-33
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Tidskriftsartikel (refereegranskat)abstract
- Sections of human skin were processed according to the indirect immunofluorescence technique with a rabbit antiserum against human protein gene product 9.5 (PGP 9.5). Immunoreactivity was detected in intraepidermal and dermal nerve fibres and cells. The intraepidermal nerves were varicose or smooth with different diameters, running as single processes or branched, straight or bent, projecting in various directions and terminating in the stratum basale, spinosum or granulosum. The density of the intraepidermal nerves varied between the different skin areas investigated. PGP 9.5-containing axons of the lower dermis were found in large bundles. They separated into smaller axon bundles within the upper dermis, entering this portion of the skin perpendicular to the surface. Then they branched into fibres mainly arranged parallel to the epidermal-dermal junctional zone. However, the fibres en route to the epidermis traversed the upper dermis more or less perpendicularly. Furthermore, immunoreactive dermal nerve fibres were found in the Meissner corpuscles, the arrector pili muscles, hair follicles, around the eccrine and apocrine sweat glands and around certain blood vessels. Such fibres were also observed around most subcutaneous blood vessels, sometimes heavily innervating these structures. Numerous weakly-to-strongly PGP 9.5-immunoreactive cells were found both in the epidermis and in the dermis.
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