Table 5.
GASPID-Defective Mice
| Genotype | GASPID Deficiency | Lung-Relevant Phenotype |
|---|---|---|
| C57Bl/6 mice | Tryptase MCP7 | Airway hyporesponsiveness; resistance to allergen sensitization |
| KitW/KitW-v or KitW-sh/KitW-sh | Mast cell GASPIDs | Lack of mast cells; decreased allergic inflammation; increased mortality from sepsis; enhanced bacterial bronchitis and pneumonia; |
| Ctsc −/− | Activated chymases
Activated cathepsin G Activated granzymes A & B Activated tryptase MCP6 |
Decreased mortality from septic peritonitis;enhanced pneumonia |
| Gzma −/− | Granzyme A | Defective cell killinga |
| NE −/− | Neutrophil elastase | Protection from emphysemaa; defective bacterial killinga |
| Gzmm −/− | Met-ase/Granzyme M | Defective control of CMV infection |
| Gzmb −/− | Granzyme B | Defective cell killinga |
| Ctsg −/− | Cathepsin G | Defective neutrophil functiona |
| Mcpt1 −/− | Chymase MCP1 | Delayed parasite expulsion; delayed mast cell recruitment & structure |
| Mcpt4 −/− | Chymase MCP4 | Decreased activation of MMP gelatinases |
| Mcpt5 −/− | Chymase/elastase MCP5(Carboxypeptidase A3) | Resistance to ischemia-reperfusion injury |
Many of these phenotypes are more dramatic when combined with other GASPID defects, as in Gzma (−/−) x Gzmb (−/−) or NE (−/−) x Ctsg (−/−) double-knockout strains (see text).