Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Query: EC:3.4.22.54 (
calpain 3
)
430
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
The ubiquitous calpains,
calpain-1
and -2, play important roles in Ca
2+
-dependent membrane repair. Mechanically active tissues like skeletal muscle are particularly reliant on mechanisms to repair and remodel membrane injury, such as those caused by eccentric damage. We demonstrate that
calpain-1
and -2 are master effectors of Ca
2+
-dependent repair of mechanical plasma membrane scrape injuries, although they are dispensable for repair/removal of small wounds caused by pore-forming agents. Using CRISPR gene-edited human embryonic kidney 293 (HEK293) cell lines, we established that loss of both calpains-1 and -2 (
CAPNS1
-/-
) virtually ablates Ca
2+
-dependent repair of mechanical scrape injuries but does not affect injury or recovery from perforation by streptolysin-O or saponin. In contrast, cells with targeted knockout of either
calpain-1
(
CAPN1
-/-
) or -2 (
CAPN2
-/-
) show near-normal repair of mechanical injuries, inferring that both
calpain-1
and calpain-2 are equally capable of conducting the cascade of proteolytic cleavage events to reseal a membrane injury, including that of the known membrane repair agent dysferlin. A severe muscular dystrophy in a murine model with skeletal muscle knockout of
Capns1
highlights vital roles for
calpain-1
and/or -2 for health and viability of skeletal muscles not compensated for by
calpain-3
(
CAPN3
). We propose that the dystrophic phenotype relates to loss of maintenance of plasma membrane/cytoskeletal networks by calpains-1 and -2 in response to directed and dysfunctional Ca
2+
-signaling, pathways hyperstimulated in the context of membrane injury. With
CAPN1
variants associated with spastic paraplegia, a severe dystrophy observed with muscle-specific loss of
calpain-1
and -2 activity identifies
CAPN2
and
CAPNS1
as plausible candidate neuromuscular disease genes.
...
PMID:Loss of calpains-1 and -2 prevents repair of plasma membrane scrape injuries, but not small pores, and induces a severe muscular dystrophy. 3234 80
<< Previous
1
2
3
4
