Lysosomal accumulation of the hormone-receptor complex during receptor- mediated endocytosis of human choriogonadotropin

نویسنده

  • M Ascoli
چکیده

The experiments presented herein were designed to determine the fate of the human choriogonadotropin (hCG) receptor during endocytosis of the receptor-bound hCG. Using several biochemical approaches, it is shown that the receptor is internalized together with the hormone into endocytic vesicles and transferred to lysosomes without ligand dissociation. Once delivered to the lysosomes, the hCG-receptor complex dissociates, and the free hormone is degraded. This pathway appears to prevent receptor recycling and probably promotes receptor degradation.

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

P-228: Altered Expression of Folliclestimulating Hormone Receptor and Luteinizing Hormone Receptor in Granulosa Cells from Women with Polycystic Ovary Syndrome

Background: Polycystic ovary syndrome (PCOS) is a common complex genetic endocrinopathy, affecting 5 - 10% of women at reproductive age. PCO granulosa cells seem to have abnormal responses to follicle- stimulating hormone (FSH). FSH is considered to be a pituitary glycoprotein that plays an important role during folliculogenesis as it promotes the proliferation and differentiation of granulosa ...

متن کامل

Phosphorylation of the lutropin/choriogonadotropin receptor facilitates uncoupling of the receptor from adenylyl cyclase and endocytosis of the bound hormone.

Stably transfected cell lines expressing the wild-type rat LH/CG receptor (rLHR) or a full-length rLHR in which S635, T638, S639, S649 and S653 were simultaneously mutated to alanine residues (designated rLHR-5S/T-->A) were used to probe the importance of receptor phosphorylation on the regulation of receptor functions. The mutant receptor binds hCG with high affinity and transduces the hormona...

متن کامل

Transport of macrophage Fc receptors and Fc receptor-bound ligands to lysosomes

Mouse macrophage Fc receptors specific for IgG1/IgG2b mediate the binding and pinocytic uptake of soluble IgG-containing antibody-antigen complexes. Internalization of these multivalent IgG complexes is accompanied not only by the intracellular degradation of the ligand, but also by a net decrease in the number of plasma membrane Fc receptors and an accelerated rate of receptor turnover. In con...

متن کامل

The Dendritic Cell Receptor for Endocytosis, Dec-205, Can Recycle and Enhance Antigen Presentation via Major Histocompatibility Complex Class II–Positive Lysosomal Compartments

Many receptors for endocytosis recycle into and out of cells through early endosomes. We now find in dendritic cells that the DEC-205 multilectin receptor targets late endosomes or lysosomes rich in major histocompatibility complex class II (MHC II) products, whereas the homologous macrophage mannose receptor (MMR), as expected, is found in more peripheral endosomes. To analyze this finding, th...

متن کامل

Leelamine mediates cancer cell death through inhibition of intracellular cholesterol transport.

Leelamine is a promising compound for the treatment of cancer; however, the molecular mechanisms leading to leelamine-mediated cell death have not been identified. This report shows that leelamine is a weakly basic amine with lysosomotropic properties, leading to its accumulation inside acidic organelles such as lysosomes. This accumulation leads to homeostatic imbalance in the lysosomal endoso...

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 Journal of Cell Biology

دوره 99  شماره 

صفحات  -

تاریخ انتشار 1984