Review
Biochemistry & Molecular Biology
Rocio Fuente, Maria Garcia-Bengoa, Angela Fernandez-Iglesias, Helena Gil-Pena, Fernando Santos, Jose Manuel Lopez
Summary: X-linked hypophosphatemia (XLH) is a common form of hereditary hypophosphatemic rickets, characterized by short stature, bone deformities, and rickets. The cause of growth impairment in XLH patients is not completely understood, necessitating further research. New treatment strategies targeting FGF23 have shown promise in improving growth velocity and skeletal effects, but more studies are needed to evaluate its impact on the growth plate, long-term effects, and adult height.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Review
Genetics & Heredity
Claudia Maria Jurca, Oana Iuhas, Kinga Kozma, Codruta Diana Petchesi, Dana Carmen Zaha, Marius Bembea, Sanziana Jurca, Corina Paul, Alexandru Daniel Jurca
Summary: X-linked hypophosphatemia is a genetic disorder characterized by a gene mutation that inactivates the degradation of FGF23, leading to decreased tubular reabsorption of phosphorus. Symptoms include growth delay and bone pain. Treatment with Burosumab has shown positive results in improving the condition of patients.
Article
Endocrinology & Metabolism
Chelsey Grimbly, Karissa Ludwig, Zenghui Wu, Oana Caluseriu, Elizabeth Rosolowsky, R. Todd Alexander, Leanne M. Ward, Frank Rauch
Summary: X-linked hypophosphatemia (XLH) is caused by dominant inactivating mutations in the PHEX gene, leading to elevated FGF23, hypophosphatemia, and skeletal abnormalities. Genetic testing identifies pathogenic variants in about 85% of XLH patients, but deep intronic variants can be missed. This case report highlights the importance of RNA diagnostics to detect deep intronic PHEX variants in patients with typical clinical features of XLH and negative DNA sequencing results.
Article
Endocrinology & Metabolism
Tian Xu, Xiaohui Tao, Zhenlin Zhang, Hua Yue
Summary: This study fully describes the clinical and genetic characteristics of patients with familial and sporadic XLH, including clinical manifestations, iFGF23 levels, and presence of PHEX gene mutations. The study found that the main symptoms were bowed lower extremities, abnormal gait, and short stature/growth retardation. Hypophosphatemia with high alkaline phosphatase levels was the main biochemical feature. Novel mutations in the PHEX gene were identified, and the recurrence rate after orthopedic surgery was high.
FRONTIERS IN ENDOCRINOLOGY
(2022)
Article
Medical Laboratory Technology
Jie-Yuan Jin, Li-Yang Zhang, Shuai Guo, Ke Tang, Lei Zeng, Rong Xiang, Jie-Yu Liang
Summary: This study identified a novel PHEX variant and showed that 3D printing technology is a very promising approach for corrective osteotomies.
JOURNAL OF CLINICAL LABORATORY ANALYSIS
(2022)
Article
Endocrinology & Metabolism
Kheloud M. Alhamoudi, Balgees Alghamdi, Meshael Alswailem, Abdul Nasir, Abeer Aljomaiah, Hindi Al-Hindi, Ali S. Alzahrani
Summary: This study reports a novel synonymous PHEX variant that causes X-linked hypophosphatemia (XLH) through a unique mechanism.
JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM
(2022)
Article
Endocrinology & Metabolism
Jian Ma, Ye Zhang, Xiaoxiao Ding, Zhijiang Liang, Chaoxiang Yang, Zhi Deng, Hui He, Zhihong Guan, Chunhua Zeng, Yunting Lin, Xianqiong Luo
Summary: This study shares the diagnostic experience on a three-generation Chinese family with co-occurrence of spondyloepiphyseal dysplasia and X-linked hypophosphatemia. Treatment with oral phosphate and calcitriol improved the radiographic signs and serum bone alkaline phosphatase levels of the patients with these rare genetic skeletal disorders.
CALCIFIED TISSUE INTERNATIONAL
(2023)
Article
Endocrinology & Metabolism
Alok Tripathi, Aijaz A. John, Deepak Kumar, Saurabh Kumar Kaushal, Devendra Pratap Singh, Nazim Husain, Jayanta Sarkar, Divya Singh
Summary: This study reports the functional role of miR-539-3p in osteoblast functions and its downstream Akap-3 signaling in the regulation of osteoblastogenesis.
FRONTIERS IN ENDOCRINOLOGY
(2022)
Article
Rheumatology
Justine Bacchetta, Anya Rothenbuhler, Iva Gueorguieva, Peter Kamenicky, Jean-Pierre Salles, Karine Briot, Agnes Linglart
Summary: Hereditary hypophosphatemia with increased FGF23 levels is a rare inherited metabolic disease characterized by low serum phosphate levels. Treatment options include oral phosphate supplementation with active vitamin D analogs or the recently approved anti-FGF23 drug burosumab.
Article
Endocrinology & Metabolism
Julio Soto Barros, Sabrina I. Sanchez, Kristin Cabral, Alan H. Beggs, Pankaj B. Agrawal, Casie A. Genetti, Catherine A. Brownstein, Thomas O. Carpenter
Summary: X-linked hypophosphatemia is a common inherited rickets caused by inactivating variants of PHEX. A prevalent variant in North America, consisting of a single base change in the 3' untranslated region (UTR) (c.*231A>G), has been reported. Recently, a duplication in exon 13-15 was found to occur together with the c.*231A>G variant, raising uncertainty regarding the sole pathogenicity of the UTR variant. We present a family with XLH who carries the exon 13-15 duplication but not the 3' UTR variant, providing evidence that the duplication itself is the pathogenic variant when these two variants are found in cis.
Article
Endocrinology & Metabolism
Julia Herrou, Jacques Fechtenbaum, Anya Rothenbuhler, Peter Kamenicky, Christian Roux, Agnes Linglart, Karine Briot
Summary: This study aimed to identify the risk factors associated with the development and progression of spinal enthesopathies in adults with X-linked hypophosphatemia. The results showed that age seems to be the main factor associated with progression.
JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM
(2023)
Article
Endocrinology & Metabolism
Marie-Noelle Meaux, Candide Alioli, Agnes Linglart, Sandrine Lemoine, Emmanuelle Vignot, Aurelia Bertholet-Thomas, Olivier Peyruchaud, Sacha Flammier, Irma Machuca-Gayet, Justine Bacchetta
Summary: This study found significantly increased expression of inflammatory markers in XLH patients and impaired osteoclast formation. This may have important implications for the extraskeletal complications of XLH.
JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM
(2022)
Article
Endocrinology & Metabolism
Alexandre Bouzemane, Emmanuelle Vignot, Laurence Derain Dubourg, Aurelie De Mul, Arnaud Molin, Roland Chapurlat, Elisabeth Fontanges, Daphne Delsart, Alirea Akbari, Shih Han Susan Huang, Christopher W. Mcintyre, Justine Bacchetta, Sandrine Lemoine
Summary: This study aimed to assess whether XLH led to an increased cardiovascular risk. Through a single-center retrospective observational study on a local cohort, it was found that XLH patients did not have an elevated risk of developing hypertension or left ventricular hypertrophy.
JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM
(2023)
Article
Cell Biology
Yu-Mian Gan, Yan-Ping Zhang, Dan-Dan Ruan, Jian-Bin Huang, Yao-Bin Zhu, Xin-Fu Lin, Xiao-Ping Xiao, Qiong Cheng, Zhen-Bo Geng, Li-Sheng Liao, Fa-Qiang Tang, Jie-Wei Luo
Summary: This study identified two PHEX mutations causing X-linked hypophosphatemic rickets and revealed a potential regulatory mechanism between PHEX and FGF23.
CELL DEATH & DISEASE
(2022)
Article
Endocrinology & Metabolism
Xiaolin Ni, Qi Zhang, Xiang Li, Qianqian Pang, Yiyi Gong, Ou Wang, Mei Li, Xiaoping Xing, Yan Jiang, Weibo Xia
Summary: This study aimed to evaluate serum sclerostin levels in TIO patients compared with healthy controls and XLH patients, and analyze the correlations with bone mineral density (BMD) and laboratory parameters.
JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM
(2022)
Article
Biochemistry & Molecular Biology
Zachary C. Ryan, Theodore A. Craig, Xuewei Wang, Philippe Delmotte, Jeffrey L. Salisbury, Ian R. Lanza, Gary C. Sieck, Rajiv Kumar
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
(2018)
Article
Biochemistry & Molecular Biology
Taylor E. Berent, Jessica M. Dorschner, Theodore A. Craig, Matthew T. Drake, Jennifer J. Westendorf, Rajiv Kumar
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
(2019)
Review
Endocrinology & Metabolism
Kittrawee Kritmetapak, Rajiv Kumar
Summary: Phosphorus is crucial for various biological processes, and its regulation is essential for organism well-being. Organisms respond to changes in inorganic phosphorus concentrations by adjusting uptake and biochemical processes, with unicellular and multicellular organisms adapting at cellular and endocrine levels respectively. Excessive phosphorus exposure, particularly in chronic kidney disease patients, can lead to various health issues.
CALCIFIED TISSUE INTERNATIONAL
(2021)
Editorial Material
Medicine, General & Internal
Frederique St-Pierre, Aditya S. Pawar, Rajiv Kumar
MAYO CLINIC PROCEEDINGS
(2019)
Article
Endocrinology & Metabolism
Michael P. Whyte, Fan Zhang, Deborah Wenkert, Steven Mumm, Theresa J. Berndt, Rajiv Kumar
Article
Endocrinology & Metabolism
Anupam Kotwal, Alejandro Ferrer, Rajiv Kumar, Ravinder J. Singh, Vishakantha Murthy, Laura Schultz-Rogers, Michael Zimmermann, Brandan Lanpher, Kristin Zimmerman, Paul R. Stabach, Eric Klee, Demetrios T. Braddock, Robert A. Wermers
JOURNAL OF BONE AND MINERAL RESEARCH
(2020)
Article
Multidisciplinary Sciences
Taylor E. Berent, Jessica M. Dorschner, Thomas Meyer, Theodore A. Craig, Xuewei Wang, Hawley Kunz, Aminah Jatoi, Ian R. Lanza, Horng Chen, Rajiv Kumar
Article
Biochemistry & Molecular Biology
Hawley E. Kunz, Jessica M. Dorschner, Taylor E. Berent, Thomas Meyer, Xuewei Wang, Aminah Jatoi, Rajiv Kumar, Ian R. Lanza
JOURNAL OF BIOLOGICAL CHEMISTRY
(2020)
Editorial Material
Urology & Nephrology
Kittrawee Kritmetapak, Rajiv Kumar
JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY
(2021)
Article
Biochemistry & Molecular Biology
Kittrawee Kritmetapak, Ravinder J. Singh, Theodore A. Craig, Jolaine M. Hines, Rajiv Kumar
Summary: The experiment showed that the short carboxyl-terminal peptides of human PTH, hPTH38-84 and hPTH45-84, increased the amount of cellular cAMP generated in cultured osteoblasts in response to treatment with full-length hPTH1-84. In contrast, human PTH28-84 had no effect on cAMP activity. Additionally, these short carboxyl peptides reduced the induction of alkaline phosphatase activity by full-length hPTH1-84 in osteoblasts.
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
(2021)
Article
Physiology
Hawley E. Kunz, John D. Port, Kenton R. Kaufman, Aminah Jatoi, Corey R. Hart, Kevin J. Gries, Ian R. Lanza, Rajiv Kumar
Summary: Reductions in skeletal muscle mass and function are often observed in cancer patients, leading to decreased quality of life, impaired treatment tolerance, and increased mortality. This study found that cancer patients had decreased physical activity, cardiorespiratory fitness, leg strength, and increased leg neuromuscular fatigue compared to healthy controls. Additionally, cancer patients exhibited lower mitochondrial oxidative capacity and ATP production, indicating mitochondrial abnormalities. These findings highlight the importance of studying mitochondria in muscle deficits associated with cancer.
JOURNAL OF APPLIED PHYSIOLOGY
(2022)
Review
Urology & Nephrology
Candice Z. Ulmer, Kittrawee Kritmetapak, Ravinder J. Singh, Hubert W. Vesper, Rajiv Kumar
Summary: This review discusses the importance of measuring both PTH 1-84 and PTH fragments in order to obtain a true biologic representation of total PTH bioactivity. It highlights current advances in methods for PTH measurement and emphasizes the usefulness of mass spectrometry as a potential reference method.
JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY
(2022)
Review
Endocrinology & Metabolism
Michael T. Collins, Gemma Marcucci, Hans-Joachim Anders, Giovanni Beltrami, Jane A. Cauley, Peter R. Ebeling, Rajiv Kumar, Agnes Linglart, Luca Sangiorgi, Dwight A. Towler, Ria Weston, Michael. P. Whyte, Maria Luisa Brandi, Bart Clarke, Rajesh V. Thakker
Summary: This review discusses the main regulators of mineralization and crystallization processes in human physiology, as well as related disorders. Advances in the past decade have improved understanding of these disorders and their genetic, molecular, and cellular mechanisms, leading to potential new therapeutic approaches.
NATURE REVIEWS ENDOCRINOLOGY
(2022)
Article
Endocrinology & Metabolism
Kittrawee Kritmetapak, Rajiv Kumar
Summary: This review summarizes the current knowledge about phosphate homeostasis, phosphatonin pathophysiology, and the clinical implications of FGF23-related hypophosphatemic disorders, with specific focus on burosumab treatment. Research suggests that burosumab is effective and safe for pediatric and adult patients with X-linked hypophosphatemia or tumor-induced osteomalacia.
ENDOCRINE PRACTICE
(2023)
Correction
Endocrinology & Metabolism
Michael T. Collins, Gemma Marcucci, Hans-Joachim Anders, Giovanni Beltrami, Jane A. Cauley, Peter R. Ebeling, Rajiv Kumar, Agnes Linglart, Luca Sangiorgi, Dwight A. Towler, Ria Weston, Michael. P. Whyte, Maria Luisa Brandi, Bart Clarke, Rajesh V. Thakker
NATURE REVIEWS ENDOCRINOLOGY
(2022)