The two Drosophila cytochrome C proteins can function in both respiration and caspase activation.

نویسندگان

  • Eli Arama
  • Maya Bader
  • Mayank Srivastava
  • Andreas Bergmann
  • Hermann Steller
چکیده

Cytochrome C has two apparently separable cellular functions: respiration and caspase activation during apoptosis. While a role of the mitochondria and cytochrome C in the assembly of the apoptosome and caspase activation has been established for mammalian cells, the existence of a comparable function for cytochrome C in invertebrates remains controversial. Drosophila possesses two cytochrome c genes, cyt-c-d and cyt-c-p. We show that only cyt-c-d is required for caspase activation in an apoptosis-like process during spermatid differentiation, whereas cyt-c-p is required for respiration in the soma. However, both cytochrome C proteins can function interchangeably in respiration and caspase activation, and the difference in their genetic requirements can be attributed to differential expression in the soma and testes. Furthermore, orthologues of the apoptosome components, Ark (Apaf-1) and Dronc (caspase-9), are also required for the proper removal of bulk cytoplasm during spermatogenesis. Finally, several mutants that block caspase activation during spermatogenesis were isolated in a genetic screen, including mutants with defects in spermatid mitochondrial organization. These observations establish a role for the mitochondria in caspase activation during spermatogenesis.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

The two cytochrome c species, DC3 and DC4, are not required for caspase activation and apoptosis in Drosophila cells

In Drosophila, activation of the apical caspase DRONC requires the apoptotic protease-activating factor homologue, DARK. However, unlike caspase activation in mammals, DRONC activation is not accompanied by the release of cytochrome c from mitochondria. Drosophila encodes two cytochrome c proteins, Cytc-p (DC4) the predominantly expressed species, and Cytc-d (DC3), which is implicated in caspas...

متن کامل

Minocycline blocks c-terminal fragments of amyloid precursor protein-induced neurotoxicity by inhibition of cytochrome c release and caspase-12 activation

Minocycline is a second-generation tetracycline that effectively crosses the blood-brain barrier. It has remarkable neuroprotective qualities in models of cerebral ischaemia, traumatic brain injury, Huntington’s and Parkinson’s diseases. However, there is no evidence about neuroprotective effects of minocycline on AD. Alzheimer’s disease (AD) is a neurodegenerative disorder characterized neurop...

متن کامل

Minocycline blocks c-terminal fragments of amyloid precursor protein-induced neurotoxicity by inhibition of cytochrome c release and caspase-12 activation

Minocycline is a second-generation tetracycline that effectively crosses the blood-brain barrier. It has remarkable neuroprotective qualities in models of cerebral ischaemia, traumatic brain injury, Huntington’s and Parkinson’s diseases. However, there is no evidence about neuroprotective effects of minocycline on AD. Alzheimer’s disease (AD) is a neurodegenerative disorder characterized neurop...

متن کامل

Cytochrome C and Caspase-3/7 are Involved in Mycophenolic Acid-induced Apoptosis in Genetically Engineered PC12 Neuronal Cells Expressing the p53 Gene

Mycophenolic acid (MPA) is the active metabolite of mycophenolate mofetil. This study designed to investigate the mechanism of cytotoxicity of MPA on the genetically engineered PC12 Tet Off (PTO) neuronal cells with p53 gene. Alamar Blue (AB) reduction showed concentration-dependent cytotoxicity of MPA on PTO cells with IC50 value of 32.32 ± 4.61 mM. The reactive oxygen species (ROS) generation...

متن کامل

Cytochrome C and Caspase-3/7 are Involved in Mycophenolic Acid-induced Apoptosis in Genetically Engineered PC12 Neuronal Cells Expressing the p53 Gene

Mycophenolic acid (MPA) is the active metabolite of mycophenolate mofetil. This study designed to investigate the mechanism of cytotoxicity of MPA on the genetically engineered PC12 Tet Off (PTO) neuronal cells with p53 gene. Alamar Blue (AB) reduction showed concentration-dependent cytotoxicity of MPA on PTO cells with IC50 value of 32.32 ± 4.61 mM. The reactive oxygen species (ROS) generation...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:
  • The EMBO journal

دوره 25 1  شماره 

صفحات  -

تاریخ انتشار 2006