D-glucose but not insulin reduces N-formyl-methionyl-leucyl-phenylalanine (fMet-Leu-Phe)-induced shape changes in suspended human neutrophils.
The effects of glucose (5-25 mM) and insulin concentration (40-320 microU/ml) on the cell shape of neutrophil granulocytes from healthy humans were studied. Both non-activated and N-formyl-methionyl-leucyl-phenylalanine (fMet-Leu-Phe)-activated neutrophils in suspension were used as a model for initial chemotactic activation of neutrophil locomotion. D-glucose, but not the non-metabolizable analogue 3-O-methyl-D-glucose, dose-dependently reduced the fMet-Leu-Phe-induced (10(-8)M) neutrophil elongation. Insulin, either alone or in combination with 25 mM D-glucose, was without effect on the fMet-Leu-Phe-induced neutrophil elongation. Furthermore, the inhibitory effect of D-glucose was observed already after 1 min of exposure to D-glucose and fMet-Leu-Phe. D-glucose diminished the fraction of neutrophils with elongated locomotor shape by changing it into an irregular cell shape, suggesting that at least part of the D-glucose effect could be associated with mechanisms determining the typical locomotor shape. The present results suggest that D-glucose through its metabolism, but without the involvement of insulin, reduces chemotactically induced elongation to a locomotor neutrophil shape, and thus neutrophil motility, and that this effect of glucose appears prior to adhesion. This glucose-induced inhibition of the neutrophil chemotactic response may be involved in the neutrophil deficiency seen in diabetes mellitus.
Oldenborg
P A
PA
Department of Histology and Cell Biology, Umeå University, Sweden.
Sehlin
J
J
D048429:Cell Size / Q000187:drug effects; D005947:Glucose / Q000494:pharmacology*; D006801:Humans; D007328:Insulin / Q000494:pharmacology*; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D009504:Neutrophils / Q000166:cytology / Q000187:drug effects*; D013997:Time Factors
D007328:Insulin; D009240:N-Formylmethionine Leucyl-Phenylalanine; D005947:Glucose