Expression of parathyroid hormone-related protein in rat articular cartilage

1995 ◽  
Vol 57 (3) ◽  
pp. 196-200 ◽  
Author(s):  
T. Tsukazaki ◽  
A. Ohtsuru ◽  
H. Enomoto ◽  
H. Yano ◽  
K. Motomura ◽  
...  
Keyword(s):  
Parathyroid Hormone ◽  
Articular Cartilage ◽  
Related Protein ◽  
Parathyroid Hormone Related Protein

Parathyroid hormone-related protein is induced by hypoxia and promotes expression of the differentiated phenotype of human articular chondrocytes

2013 ◽  
Vol 125 (10) ◽  
pp. 461-470 ◽  
Author(s):  
Michele Pelosi ◽  
Stefano Lazzarano ◽  
Brendan L. Thoms ◽  
Chris L. Murphy
Keyword(s):  
Parathyroid Hormone ◽  
Articular Cartilage ◽  
Growth Plate ◽  
Articular Chondrocytes ◽  
Human Articular Chondrocytes ◽  
Long Bone ◽  
Human Articular Cartilage ◽  
Dependent Manner ◽  
Related Protein ◽  
Parathyroid Hormone Related Protein

PTHrP (parathyroid hormone-related protein) is crucial for normal cartilage development and long bone growth and acts to delay chondrocyte hypertrophy and terminal differentiation in the growth plate. After growth plate closure adult HACs (human articular chondrocytes) still produce PTHrP, suggesting a possible role for this factor in the permanent articular cartilage. However, the expression regulation and function of PTHrP in the permanent articular cartilage is unknown. Human articular cartilage is an avascular tissue and functions in a hypoxic environment. The resident chondrocytes have adapted to hypoxia and use it to drive their tissue-specific functions. In the present study, we explored directly in normal articular chondrocytes isolated from a range of human donors the effect of hypoxia on PTHrP expression and whether PTHrP can regulate the expression of the permanent articular chondrocyte phenotype. We show that in HACs PTHrP is up-regulated by hypoxia in a HIF (hypoxia-inducible factor)-1α and HIF-2α-dependent manner. Using recombinant PTHrP, siRNA-mediated depletion of endogenous PTHrP and by blocking signalling through its receptor [PTHR1 (PTHrP receptor 1)], we show that hypoxia-induced PTHrP is a positive regulator of the key cartilage transcription factor SOX9 [SRY (sex determining region on the Y chromosome)-box 9], leading to increased COL2A1 (collagen type II, α1) expression. Our findings thus identify PTHrP as a potential factor for cartilage repair therapies through its ability to promote the differentiated HAC phenotype.

Parathyroid Hormone–Related Protein Inhibits Endothelin-1 Production

Hypertension ◽  
1996 ◽  
Vol 27 (3) ◽  
pp. 360-363 ◽  
Author(s):  
Bingbing Jiang ◽  
Shigeto Morimoto ◽  
Keisuke Fukuo ◽  
Atsushi Hirotani ◽  
Michio Tamatani ◽  
...  
Keyword(s):  
Parathyroid Hormone ◽  
Related Protein ◽  
Endothelin 1 ◽  
Parathyroid Hormone Related Protein

Parathyroid Hormone–Related Protein Upregulates Interleukin-1β–Induced Nitric Oxide Synthesis

Hypertension ◽  
1997 ◽  
Vol 30 (4) ◽  
pp. 922-927 ◽  
Author(s):  
Bingbing Jiang ◽  
Shigeto Morimoto ◽  
Jin Yang ◽  
Keisuke Fukuo ◽  
Atsushi Hirotani ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Parathyroid Hormone ◽  
Interleukin 1Β ◽  
Nitric Oxide Synthesis ◽  
Related Protein ◽  
Parathyroid Hormone Related Protein

scholarly journals Purification and Characterization of Recombinant Human Parathyroid Hormone-related Protein

1989 ◽  
Vol 264 (25) ◽  
pp. 14806-14811
Author(s):  
R G Hammonds ◽  
P McKay ◽  
G A Winslow ◽  
H Diefenbach-Jagger ◽  
V Grill ◽  
...  
Keyword(s):  
Parathyroid Hormone ◽  
Related Protein ◽  
Human Parathyroid Hormone ◽  
Purification And Characterization ◽  
Parathyroid Hormone Related Protein

scholarly journals Extracellular vesicles-released parathyroid hormone-related protein from Lewis lung carcinoma induces lipolysis and adipose tissue browning in cancer cachexia

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wenjun Hu ◽  
Hairong Xiong ◽  
Zeyuan Ru ◽  
Yan Zhao ◽  
Yali Zhou ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Parathyroid Hormone ◽  
Lung Carcinoma ◽  
Lewis Lung Carcinoma ◽  
Cancer Cachexia ◽  
Lewis Lung ◽  
Related Protein ◽  
Parathyroid Hormone Related Protein ◽  
Tissue Browning

AbstractCancer cachexia is a metabolic disorder characterized by skeletal muscle wasting and white adipose tissue browning. Specific functions of several hormones, growth factors, and cytokines derived from tumors can trigger cachexia. Moreover, adipose tissue lipolysis might explain weight loss that occurs owing to cachexia. Extracellular vesicles (EVs) are involved in intercellular communication. However, whether EVs participate in lipolysis induced by cancer cachexia has not been thoroughly investigated. Using Lewis lung carcinoma (LLC) cell culture, we tested whether LLC cell-derived EVs can induce lipolysis in 3T3-L1 adipocytes. EVs derived from LLC cells were isolated and characterized biochemically and biophysically. Western blotting and glycerol assay were used to study lipolysis. LLC cell-derived EVs induced lipolysis in vivo and vitro. EVs fused directly with target 3T3-L1 adipocytes and transferred parathyroid hormone-related protein (PTHrP), activating the PKA signaling pathway in 3T3-L1 adipocytes. Blocking PTHrP activity in LLC-EVs using a neutralizing antibody and by knocking down PTHR expression prevented lipolysis in adipocytes. Inhibiting the PKA signaling pathway also prevents the lipolytic effects of EVs. In vivo, suppression of LLC-EVs release by knocking down Rab27A alleviated white adipose tissue browning and lipolysis. Our data showed that LLC cell-derived EVs induced adipocyte lipolysis via the extracellular PTHrP-mediated PKA pathway. Our data demonstrate that LLC-EVs induce lipolysis in vitro and vivo by delivering PTHrP, which interacts with PTHR. The lipolytic effect of LLC-EVs was abrogated by PTHR knockdown and treatment with a neutralizing anti-PTHrP antibody. Together, these data show that LLC-EV-induced lipolysis is mediated by extracellular PTHrP. These findings suggest a novel mechanism of lipid droplet loss and identify a potential therapeutic strategy for cancer cachexia.

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