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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Cyclic+Nucleotide+Protein+Phosphor+Res 1986 ; 11 (2): 87-97 Nephropedia Template TP
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Do porins inhibit the macrophage phagocyting activity by stimulating the adenylate cyclase? #MMPMID2426319
Di Donato A; Draetta GF; Illiano G; Tufano MA; Sommese L; Galdiero F
J Cyclic Nucleotide Protein Phosphor Res 1986[]; 11 (2): 87-97 PMID2426319show ga
Porins interact with macrophage membranes and inhibit their phagocyting activity. We have tested the porin effect on a biologically relevant membrane-bound enzymic activity, the adenylate cyclase system, which appears to be stimulated both in the presence of Mn2+ and Mg2+ or Mg2+ + Gpp(NH)p. Moreover, for mice macrophages incubated in the presence of porins, there is an increase in the intracellular cAMP content after 5 min of incubation, with a maximum after 15 min of incubation. The results shown suggest that the porin effects on the adenylate cyclase can represent the molecular basis of the porin-dependent inhibition of the macrophages phagocytosis. Our point of view, which proposes a cAMP role in inhibiting the phagocyting activity in macrophages, is supported also by the results of the experiments carried out in the presence of both dibutyryl-cAMP or aminophylline. The phagocyting activity is inhibited in all cases and independently of the bacteria to be phagocyted.