Animal experiment:

Male ICR mice weighing 18 to 25 g are used in the assay. PMSF is dissolved in sesame oil and administered i.p. at a volume of 0.1 mL/10 g b.wt. PMSF is always administered 10 min before i.v. anandamide or vehicle injections. Mice are acclimated to the evaluation room overnight without interruption of food or water. After i.v. anandamide or vehicle administration each animal is evaluated as follows: tail-flick latency (antinociception) response at 5 min and spontaneous (locomotor) activity at 5 to 15 min; or core (rectal) temperature at 5 min and ring-immobility (catalepsy) at 5 to 10 min.

• iScience (2022): 105774.

PMSF (Phenylmethanesulfonyl fluoride) is an irreversible inhibitor of serine proteinases, which is associated with the development of the delayed organophosphorus neuropathy. It has a role in a lot of cellular repair and regeneration processes in many kinds of tissues. PMSF is a long acting Neuropathy Target Esterase (NTE) inhibitor. NTE is a protection was related to inhibition of the putative target of organophosphate-induced delayed polyneuropathy (OPIDP). PMSF can increase NTE inhibition to more than 90%. PMSF also acts as an active site directed reagent for γ-glutamyl transpeptidase.

Reference

Thomas Baker, Herbert E. Lowndes, Martin K. Johnson, Irene C. Sandborg. The effects of phenylmethanesulfonyl fluoride on delayed organophosphorus neuropathy. Archives of Toxicology. 1980; 46(3-4): 305 – 311.

Marcello Lotti, Stefano Caroldi, Eugenio Capodicasa, Angelo Moretto. Promotion of organophosphate-induced delayed polyneuropathy by phenylmethanesulfonyl fluoride. Toxicology and Applied Pharmacology. 1991; 108(2): 234 – 241.

Masayasu Inoue, Seikoh Horiuchi, Yoshimasa Morino. Inactivation of γ-glutamyl transpeptidase by phenylmethanesulfonyl fluoride, a specific inactivator of serine enzymes. Biochemical and Biophysical Research Communications. 1978; 82(4): 1183 – 1188.