scholarly journals The Parathyroid Hormone and Peptides Like It. Literature Review

2019 ◽  
Vol 74 (2) ◽  
pp. 136-144 ◽  
Author(s):  
Natalia G. Mokrysheva ◽  
Julia A. Krupinova ◽  
Elena V. Kovaleva
Keyword(s):  
Parathyroid Hormone ◽  
Phosphate Homeostasis ◽  
Amino Terminal ◽  
New Methods ◽  
Parathyroid Hormone Related Protein ◽  
Wide Range ◽  
The Family ◽  
Genes Encoding ◽  
Tuberoinfundibular Peptide ◽  
Homologous Amino Acid

Wide prevalence of the parathyroid glands pathology and the need for new methods of diagnosis and treatment are forcing researchers all over the world to go more deeply into the pathophysiological mechanisms. A parathyroid hormone (PTH) is main cause of mineral disorders. In addition, humans have a family with similar in structure molecules that contribute to the maintenance of calcium and phosphate homeostasis. The family includes PTH, parathyroid hormone-related protein (PTHrP) and tuberoinfundibular peptide 39 (TIP39, also known as PTH2). The genes encoding these peptides have highly homologous amino acid regions in the N-(amino) terminal receptor-binding sites of each family member, as well as the preserved structure of their organization, which seems to be due to the presence of one parent gene. The variety of classical and “non-classical” effects allows to expand the understanding of these substances and consider them as hormones that go beyond the regulation of phosphorus-calcium metabolism. The review provides information on the structure and biosynthesis of these peptides, as well as a wide range of their effects on the human body.

Circulating levels of immunoreactive parathyroid hormone-related protein and intact parathyroid hormone in human fetuses and newborns

1996 ◽  
Vol 134 (4) ◽  
pp. 437-442 ◽  
Author(s):  
Nicholas E Papantoniou ◽  
Peter D Papapetrou ◽  
Aristidis J Antsaklis ◽  
Panayotis E Kontoleon ◽  
Spyros A Mesogitis ◽  
...  
Keyword(s):  
Parathyroid Hormone ◽  
Reproductive Age ◽  
Fetal Life ◽  
Intact Parathyroid Hormone ◽  
Human Fetuses ◽  
Related Protein ◽  
Amino Terminal ◽  
Parathyroid Hormone Related Protein ◽  
Circulating Levels ◽  
Immunoreactive Parathyroid Hormone

Papantoniou NE, Papapetrou PD, Antsaklis AJ, Kontoleon PE, Mesogitis SA, Aravantinos D. Circulating levels of immunoreactive parathyroid hormone-related protein and intact parathyroid hormone in human fetuses and newborns. Eur J Endocrinol 1996;134:437–42. ISSN 0804–4643 Undetectable or extremely low levels of circulating immunoreactive parathyroid hormone (PTH) have been reported in human newborns while PTH bioactivity was high. This prompted the hypothesis that the fetal calcemic hormone might be PTH-related protein. The purpose of this study was to measure circulating immunoreactive PTH-related protein in human fetuses and newborns in order to investigate this hypothesis. Parathyroid hormone-related protein (PTHrP(1–86)) and intact PTH were measured using two-site immunoradiometric assays in plasma obtained by cordocentesis from 23 fetuses (19–33 weeks of gestation), from 17 newborns at term (38–41 weeks), from their mothers and from 22 normal women of reproductive age. Plasma PTHrP was detectable in all but one of the fetuses and newborns and in all the mothers and the controls. The mean level was similar among fetuses (19–33 weeks) (0.43 ± 0.18 pmol/l), newborns (0.48 ±0.12), mothers (0.48 ±0.14) and normal controls (0.46 ± 0.09). Plasma PTH was found to be significantly higher in fetuses at midgestation (1.0 ± 0.99 pmol/l) than in the newborns (0.22 ± 0.21) (p < 0.0025); maternal PTH was significantly higher compared to fetal level at mid-gestation (2.1 ± 1.0, p < 0.01) as well as at term (2.69 ± 1.40, p < 0.001). In the control women PTH was 3.07 ± 1.25 pmol/l. These results showed that plasma amino-terminal PTHrP-(1–86)) is detectable during the second half of human fetal life and its level remains unchanged during this period of time, in contrast to changing levels of fetal plasma PTH. The relatively low PTHrP-(1–86) level that we found in the newborns is not responsible for the high PTH-like bioactivity found by some investigators in cord blood at term. Peter D Papapetrou, Second Division of Endocrinology, "Alexandra" Hospital, 80 Vas. Sofias & Lourou Streets, Athens 115 28, Greece

Actions of parathyroid hormone-related protein on the rat kidney in vivo

1989 ◽  
Vol 122 (1) ◽  
pp. 229-235 ◽  
Author(s):  
H. Zhou ◽  
D. D. Leaver ◽  
J. M. Moseley ◽  
B. Kemp ◽  
P. R. Ebeling ◽  
...  
Keyword(s):  
Parathyroid Hormone ◽  
Infusion Rate ◽  
Rat Kidney ◽  
Physiological Activity ◽  
Calcium Excretion ◽  
Related Protein ◽  
Renal Handling ◽  
Amino Terminal ◽  
Parathyroid Hormone Related Protein

ABSTRACT Peptides containing residues 1–34 of parathyroid hormone-related protein (PTHrP) and of bovine parathyroid hormone (bPTH), and recombinant full-length PTHrP(1–141) were infused i.v. into anaesthetized thyroparathyroidectomized rats to compare their action and potency on the renal handling of calcium, phosphate and cyclic AMP (cAMP) in vivo. All three peptides decreased the excretion of calcium and increased the excretion of phosphate and cAMP in the urine, with PTHrP(1–34) and PTHrP(1–141) having virtually equipotent effects. Thus the essential requirements for the major physiological activity of PTHrP on the kidney are contained within the 34 amino-terminal amino acids. For all three peptides, the lowest infusion rate that increased phosphate and cAMP excretion was 0·01 nmol/kg per h, whereas the lowest infusion rate that decreased calcium excretion was 0·025 nmol/kg per h for the PTHrP peptides and 0·1 nmol/kg per h for bPTH(1–34). The response to the PTHrP peptides was maximal at an infusion rate of 01 nmol/kg per h for both calcium and phosphate. Since the kidney is either equally sensitive to PTHrP and bPTH(1–34), or more sensitive to PTHrP than to bPTH(1–34), the hypercalcaemia of humoral hypercalcaemia of malignancy may develop because uncontrolled secretion of PTHrP increases the renal reabsorption of calcium to such an extent that even a modest increase in the inflow of calcium into the blood raises plasma calcium concentration. Journal of Endocrinology (1989) 122, 229–235

scholarly journals Coherent Expression Chromosome Cluster Analysis Reveals Differential Regulatory Functions of Amino-Terminal and Distal Parathyroid Hormone-Related Protein Domains in Prostate Carcinoma

2005 ◽  
Vol 2005 (4) ◽  
pp. 353-363 ◽  
Author(s):  
I. Tsigelny ◽  
D. W. Burton ◽  
Y. Sharikov ◽  
R. H. Hastings ◽  
L. J. Deftos
Keyword(s):  
Parathyroid Hormone ◽  
Cancer Cell ◽  
Prostate Carcinoma ◽  
Human Cancer ◽  
Expression Profiles ◽  
Cancer Cell Line ◽  
Biologically Active ◽  
Related Protein ◽  
Amino Terminal ◽  
Parathyroid Hormone Related Protein

Parathyroid hormone-related protein (PTHrP) has a number of cancer-related actions. While best known for causing hypercalcemia of malignancy, it also has effects on cancer cell growth, apoptosis, and angiogenesis. Studying the actions of PTHrP in human cancer is complicated because there are three isoforms and many derived peptides. Several peptides are biologically active at known or presumed cell surface receptors; in addition, the PTHrP-derived molecules can exert effects at the cell nucleus. To address this complexity, we studied gene expression in a DU 145 prostate cancer cell line that was stably transfected with control vector, PTHrP 1-173 and PTHrP 33-173. With this model, regulatory effects of the amino-terminal portion of PTHrP would result only from transduction with the full-length molecule, while effects pertaining to distal sequences would be evident with either construct. Analysis of the expression profiles by microarrays demonstrated nonoverlapping groups of differentially expressed genes. Amino-terminal PTHrP affected groups of genes involved in apoptosis, prostaglandin and sex steroid metabolism, cell-matrix interactions, and cell differentiation, while PTHrP 33-173 caused substantial increases in MHC class I antigen expression. This work demonstrates the distinct biological actions of the amino-terminus compared to distal mid-molecule or carboxy-terminal sequences of PTHrP in prostate carcinoma cells and provides targets for further study of the malignant process.

scholarly journals Characterization of the human and mouse genes encoding the tuberoinfundibular peptide of 39 residues, a ligand of the parathyroid hormone receptor family

2002 ◽  
Vol 174 (1) ◽  
pp. 95-102 ◽  
Author(s):  
IA Hansen ◽  
O Jakob ◽  
S Wortmann ◽  
T Arzberger ◽  
B Allolio ◽  
...  
Keyword(s):  
Parathyroid Hormone ◽  
Receptor Activation ◽  
Human Organism ◽  
Ligand Interaction ◽  
Transfected Cells ◽  
Genes Encoding ◽  
Tuberoinfundibular Peptide ◽  
Human And Mouse ◽  
Receptor Family

The polypeptide TIP39 (tuberoinfundibular peptide of 39 residues) is a potent activator of the parathyroid hormone (PTH)-2 receptor (P2R) and an antagonist of the PTH-1 receptor (P1R). To clarify its possible physiological function(s), we studied its interaction with the human P1R and P2R and examined the expression of TIP39 in man and mouse. To find out possible sites of this ligand interaction in the organism, we identified the genes encoding the TIP39 protein precursors of Homo sapiens and Mus musculus in the databases of the human and mouse genome projects respectively. We then obtained the full-length cDNAs of both species by RACE-PCR. The deduced TIP39 preprohormones consist of an N-terminal 30 amino acid (aa) signal peptide followed by a 29 aa TIP39 precursor-related peptide, an Arg-Arg processing site, and the actual 39 aa TIP39 sequence. The first 23 aa of the actual TIP39 sequence, thought to contain the P2R receptor activation site, are identical in man and mouse and thus phylogenetically conserved. By contrast, the 16 aa C-terminal portion showed a higher degree of diversity (75% aa identity). By using RT-PCR, TIP39 was found to be highly expressed in human central nervous system tissues, trachea, fetal liver, and, to a lesser degree, in human heart and kidney. Using in situ hybridization, TIP39 mRNA expression was revealed in various areas of the mouse brain. In a homologous human cell model using human embryonic kidney 293 cells stably transfected with human P1R and P2R, human TIP39 did bind to P1R with moderate affinity (IC(50) approximately 10(-7)-10(-6 )M), but showed higher affinity binding to P2R (IC(50) approximately 10(-8)M), comparable to the affinity of human N-terminal PTH (hPTH(1-34)) to this receptor. In P2R-transfected cells, the cAMP pathway was activated more efficiently ( approximately 10-fold) by TIP39 as a ligand compared to hPTH(1-34). In P1R-transfected cells, only hPTH(1-34) but not TIP39 was able to elicit a cAMP response, but TIP39 was able to directly antagonize the cAMP-stimulating effect of hPTH(1-34) on this receptor. In conclusion, we could show a possible function of TIP39 for the human organism as a potent activator of P2R (e.g. in brain) as well as an antagonist of the action of PTH and/or PTH-related protein on P1R (e.g. in bone and kidney). The physiological role of TIP39 in calcium metabolism with regard to these actions remains to be determined. The tools developed in this work will allow us to investigate the possible role of TIP39 as a locally or systemically secreted ligand modulating the function of the PTH receptor family.

Overexpression of parathyroid hormone-related protein or parathyroid hormone in transgenic mice impairs branching morphogenesis during mammary gland development

Development ◽  
1995 ◽  
Vol 121 (11) ◽  
pp. 3539-3547 ◽  
Author(s):  
J.J. Wysolmerski ◽  
J.F. McCaughern-Carucci ◽  
A.G. Daifotis ◽  
A.E. Broadus ◽  
W.M. Philbrick
Keyword(s):  
Parathyroid Hormone ◽  
Transgenic Mice ◽  
Branching Morphogenesis ◽  
Mammary Glands ◽  
Myoepithelial Cells ◽  
Breast Development ◽  
Related Protein ◽  
Amino Terminal ◽  
Parathyroid Hormone Related Protein ◽  
Breast Hypoplasia

Parathyroid hormone-related protein (PTHrP) was originally discovered as the tumor product that causes humoral hypercalcemia of malignancy. PTHrP is now known to be widely expressed in many normal fetal tissues where it may participate in the regulation of organogenesis. In this report, we document that overexpression of PTHrP in myoepithelial cells in the mammary glands of transgenic mice resulted in a form of breast hypoplasia characterized by a profound defect in branching morphogenesis of the developing mammary duct system. In addition, transgenic mice manifested a defect in lobuloalveolar development during pregnancy that seemed to be, in part, the consequence of an impaired ability to form terminal ducts in response to estrogen and progesterone stimulation. The effects of PTHrP on branching morphogenesis during breast development appeared to be the result of amino-terminal PTH-like sequences that signal through the PTH/PTHrP receptor, since overexpression of parathyroid hormone itself in the mammary glands of transgenic mice caused a similar development phenotype, and delivery of PTHrP (1–36) via locally implanted slow-release pellets impaired breast development in normal mice. These results suggest that PTHrP, which is a native product of mammary epithelial and myoepithelial cells may participate in normal breast development, perhaps as a locally secreted growth inhibitor.

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