Characterization of clofibrate-induced retrograde Golgi membrane movement to the endoplasmic reticulum: clofibrate distinguishes the Golgi from the trans Golgi network.
Clofibrate-induced retrograde Golgi membrane movement was blocked or retarded when NRK cells were treated with sodium azide/2-deoxyglucose, nocodazole, taxol, and destruxin B, indicating that it depends on energy, and the dynamic state of microtubules, and being acidic or vacuolar-type ATPase function. PDMP and phospholipase A2 inhibitors also blocked it. These characteristics are similar to those of brefeldin A (BFA) and nordihydroguaiaretic acid (NDGA), inducers of retrograde Golgi membrane movement. However, clofibrate was distinguished from BFA in that BFA action was insensitive to phospholipase A2 inhibitors and from NDGA in that NDGA stabilized microtubules against nocodazole and its action was almost insensitive to taxol. The trans Golgi network (TGN) was resistant to clofibrate, while BFA and NDGA dispersed it. To our knowledge, clofibrate is the first drug to show such different effects on the Golgi and TGN and, therefore, is expected to be a useful tool to distinguish their architecture and/or membrane dynamics.
Nakamura
M
M
Animal and Cellular Systems Laboratory, RIKEN (The Institute of Physical and Chemical Research), Saitama, Japan.
Kuroiwa
N
N
Kono
Y
Y
Takatsuki
A
A
D000251:Adenosine Triphosphatases / Q000037:antagonists & inhibitors; D000255:Adenosine Triphosphate / Q000502:physiology; D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D000924:Anticholesteremic Agents / Q000494:pharmacology*; D020126:Brefeldin A / Q000494:pharmacology; D002460:Cell Line; D002994:Clofibrate / Q000494:pharmacology*; D004721:Endoplasmic Reticulum / Q000187:drug effects*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005456:Fluorescent Dyes; D006056:Golgi Apparatus / Q000187:drug effects*; D007425:Intracellular Membranes / Q000187:drug effects; D009637:Masoprocol / Q000494:pharmacology; D008856:Microscopy, Fluorescence; D010741:Phospholipases A / Q000037:antagonists & inhibitors; D054467:Phospholipases A2; D051381:Rats
D000911:Antibodies, Monoclonal; D000924:Anticholesteremic Agents; D004791:Enzyme Inhibitors; D005456:Fluorescent Dyes; D020126:Brefeldin A; D009637:Masoprocol; D000255:Adenosine Triphosphate; D010741:Phospholipases A; D054467:Phospholipases A2; D000251:Adenosine Triphosphatases; D002994:Clofibrate