1
|
Borromeo V, Berrini A, De Grandi F, Cremonesi F, Fiandanese N, Pocar P, Secchi C. A novel monoclonal antibody-based enzyme-linked immunosorbent assay to determine luteinizing hormone in bovine plasma. Domest Anim Endocrinol 2014; 48:145-57. [PMID: 24906940 DOI: 10.1016/j.domaniend.2014.03.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Revised: 03/25/2014] [Accepted: 03/30/2014] [Indexed: 10/25/2022]
Abstract
The development of a novel enzyme-linked immunosorbent assay (ELISA) for determining luteinizing hormone (LH) in bovine plasma is described. Anti-bovine LH (bLH) monoclonal antibodies (mAbs) were produced and characterized. One mAb recognizing the bLH β subunit was used for immunoaffinity purification of substantial amounts of biologically active bLH from pituitary glands. The purified bLH in combination with 2 anti-bLH β subunit mAbs was used to develop a sandwich ELISA, which satisfied all the criteria required to investigate LH secretory patterns in the bovine species. The ELISA standard curve was linear over the range 0.05 to 2.5 ng/mL, and the assay proved suitable for measuring bLH in plasma without any prior treatment of samples. Cross-reactivity and recovery tests confirmed the specificity of the method. The intra- and inter-assay coefficients of variation ranged between 3.41% and 9.40%, and 9.29% and 15.84%, respectively. The analytical specificity of the method was validated in vivo by provocative tests for LH in heifers, using the LH releasing peptide gonadotropin-releasing hormone. In conclusion, the adoption of mAbs for this ELISA for coating the wells and labeling, combined with the easy one-step production of reference bLH, ensures long-term continuity in large-scale measurements of LH in the bovine species.
Collapse
Affiliation(s)
- V Borromeo
- Dipartimento di Scienze Veterinarie e Sanità Pubblica, Università degli Studi, Milano, Italy.
| | - A Berrini
- Dipartimento di Scienze Veterinarie e Sanità Pubblica, Università degli Studi, Milano, Italy
| | - F De Grandi
- Dipartimento di Scienze Veterinarie e Sanità Pubblica, Università degli Studi, Milano, Italy
| | - F Cremonesi
- Dipartimento di Scienze Veterinarie per la Salute, la Produzione Animale e la Sicurezza Alimentare, Università degli Studi, Milano, Italy
| | - N Fiandanese
- Dipartimento di Scienze Veterinarie e Sanità Pubblica, Università degli Studi, Milano, Italy
| | - P Pocar
- Dipartimento di Scienze Veterinarie e Sanità Pubblica, Università degli Studi, Milano, Italy
| | - C Secchi
- Dipartimento di Scienze Veterinarie e Sanità Pubblica, Università degli Studi, Milano, Italy
| |
Collapse
|
2
|
Chaudhary R, Muralidhar K. Use of SP-Sephadexto fractionate and obtain semi-pure preparation from whole pituitaries of Indian water buffaloes (Bubalus bubalis). Prep Biochem Biotechnol 2004; 34:315-29. [PMID: 15553902 DOI: 10.1081/pb-200030971] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Different charge isoforms of native Luteinizing hormone (LH) (dimeric form) Ve/Vo = 1.49 can be fractionated on SP-Sephadex into four different charge isoforms (LHUB, LH25, LH50, and LH100) by stepwise elution using different molarities of Na2HPO4. LHUB was found to be difficult to purify, whereas LH50 and LH100 were found to be pure and highly immunoreactive against anti-bLHbeta serum as indicated by the results obtained from direct binding ELISA and Western blot analysis. SDS-PAGE of LH50 and LH100 showed two bands corresponding to the two subunits of LH. LH25 can be purified to homogeneity by rechromatography on S-300. Purification of buLH as a highly immunoreactive preparation has also been described using SP-Sephadex. This LH preparation (SP25B), which was obtained after slight modification in the pre-existing protocol, has been found to be highly immunoreactive against anti-bLHbeta serum in direct binding ELISA. Being a very simple and reproducible method, it can be used to obtain pure LH preparation, as a reference material, in a short period of time for various immunoassays and bioassays.
Collapse
Affiliation(s)
- Rajesh Chaudhary
- Hormone Research Laboratory, Department of Zoology, University of Delhi, Delhi, India
| | | |
Collapse
|
3
|
East L, Rushton S, Taylor ME, Isacke CM. Characterization of sugar binding by the mannose receptor family member, Endo180. J Biol Chem 2002; 277:50469-75. [PMID: 12399458 DOI: 10.1074/jbc.m208985200] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Members of the mannose receptor family, the mannose receptor, the phospholipase A(2) receptor, DEC-205, and Endo180, contain multiple C-type lectin-like domains (CTLDs) within a single polypeptide. In addition, at their N termini, all four family members contain a cysteine-rich domain similar to the R-type carbohydrate recognition domains of ricin. However, despite the common presence of multiple lectin-like domains, these four endocytic receptors have divergent ligand binding activities, and it is clear that the majority of these domains do not bind sugars. Here the functions of the lectin-like domains of the most recently discovered family member, Endo180, have been investigated. Endo180 is shown to bind in a Ca(2+)-dependent manner to mannose, fucose, and N-acetylglucosamine but not to galactose. This activity is mediated by one of the eight CTLDs, CTLD2. Competition assays indicate that the monosaccharide binding specificity of Endo180 CTLD2 is similar to that of mannose receptor CTLD4. However, additional experiments indicate that, unlike the cysteine-rich domain of the mannose receptor, the cysteine-rich domain of Endo180 does not bind sulfated sugars. Thus, although Endo180 and the mannose receptor are now both known to be mannose binding lectins, each receptor is likely to have a distinct set of glycoprotein ligands in vivo.
Collapse
Affiliation(s)
- Lucy East
- Breakthrough Toby Robins Breast Cancer Research Centre, Institute of Cancer Research, Chester Beatty Laboratories, London SW3 6JB, United Kingdom
| | | | | | | |
Collapse
|
4
|
Chopineau M, Maurel MC, Combarnous Y, Durand P. Topography of equine chorionic gonadotropin epitopes relative to the luteinizing hormone and follicle-stimulating hormone receptor interaction sites. Mol Cell Endocrinol 1993; 92:229-39. [PMID: 7686516 DOI: 10.1016/0303-7207(93)90013-a] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
In order to localize the epitopes of equine chorionic gonadotropin (eCG) involved in interaction with luteinizing hormone (LH) and follicle-stimulating hormone (FSH) receptors, we used 14 monoclonal anti-eCG antibodies (mAbs). Different effects of these mAbs on the bioactivities of eCG were observed in in vitro bioassays, but the effects of each mAb on the two bioactivities were similar for all but four mAbs. All mAbs were found to inhibit the binding of eCG to LH receptors except 3A3 mAb, in radioreceptor assay. Six mAbs, which were strong inhibitors of eCG binding to LH receptors and of both bioactivities, recognized the same area on the alpha subunit of eCG. All others, except 3A3, recognized epitopes close to the former, and close to each other. 3A3 mAb had a hyperstimulatory effect on FSH bioactivity, and was the only mAb that did not inhibit binding. It appeared to recognize a different epitopic area. These observations suggest that there is a main antigenic area on eCG, which corresponds to the interaction site of eCG with both receptors. It mostly involves the alpha subunit and to a lesser extent the beta subunit.
Collapse
Affiliation(s)
- M Chopineau
- Station de Physiologie de la Reproduction, Institut National de la Recherche Agronomique, URA CNRS 1291, Nouzilly, France
| | | | | | | |
Collapse
|
5
|
Maurel MC, Ban E, Bidart JM, Combarnous Y. Immunochemical study of equine chorionic gonadotropin (eCG/PMSG): antigenic determinants on alpha- and beta-subunits. BIOCHIMICA ET BIOPHYSICA ACTA 1992; 1159:74-80. [PMID: 1382612 DOI: 10.1016/0167-4838(92)90077-q] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In the present study we have established an immunochemical mapping of equine Chorionic Gonadotropin (eCG/PMSG) using three monoclonal antibodies (mAbs), namely the antibodies ECG01, E10 and D7, raised against the native hormone. These antibodies do not bind to reduced, alkylated hormone, suggesting that they recognize discontinuous rather than continuous epitopes. We have also assessed the reactivity of mAbs towards human CG, and ovine, porcine, equine and bovine LH and FSH. The antigenic determinant recognized by ECG01 is localized on the alpha-subunit of equine gonadotropins and of human CG and LH. The epitopes recognized by E10 and D7 mAbs appear to be very similar and are present on the beta-subunit of eCG and of LHs from all species tested, except hLH, as well as on porcine and equine FSHs. Attempts to specify the amino-acid residues involved in these epitopes suggest that ECG01 mAb might preferentially bind to residues around position 70 whereas the region around disulfide bridges Cys-88-Cys-90 might be involved in the epitopes recognized by D7 and E10 mAbs. Topographical relationships of epitopes show that ECG01 mAb never binds to eCG simultaneously with either D7 or E10 mAbs. Furthermore, simultaneous binding of D7 and E10 mAbs on eCG could not be achieved. Thus, these three epitopes appear to be closely located on the surface of eCG. Finally, ECG01 mAb inhibits eCG binding to LH and FSH receptors, suggesting that its antigenic site is closely related to hormone-receptor interaction site(s).
Collapse
Affiliation(s)
- M C Maurel
- I.N.R.A., Station de Physiologie de la Reproduction, Nouzilly, France
| | | | | | | |
Collapse
|
6
|
Kumar TR, Prakash V, Muralidhar K. Studies on buffalo pituitary lutropin (LH): physicochemical and immunological properties. JOURNAL OF PROTEIN CHEMISTRY 1990; 9:727-33. [PMID: 2073324 DOI: 10.1007/bf01024767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Physicochemical and immunological properties of buffalo pituitary lutropin (buffalo LH) are reported here. The preparation was shown to be homogeneous by several physicochemical criteria. The molecular weight was found to be 30,000-40,000 by SDS-PAGE, GP-HPLC, and ultracentrifugation analyses. It showed certain interesting features, such as anomalous sedimentation behavior, microheterogeneity due to sugar-linked sulfate, and weak immunogenicity in rabbits. The subunit nature of the hormone has been confirmed. Sugar composition showed similarities as well as differences with LH of other species. Preliminary data on the homologous and heterologous RIAs, using iodinated sheep LH and buffalo LH and the respective antisera, have also been given.
Collapse
Affiliation(s)
- T R Kumar
- Department of Zoology, University of Delhi, India
| | | | | |
Collapse
|
7
|
Nomura K, Horiba N, Sato Y, Ujihara M, Demura H, Shizume K. Renotropic activity of lutropin: direct stimulation of DNA synthesis of cultured rat renal cortical cells. Biochem Biophys Res Commun 1988; 150:506-10. [PMID: 3337728 DOI: 10.1016/0006-291x(88)90549-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Two differently purified ovine lutropin (LH) preparations were studied to see if they stimulated [3H] thymidine incorporation into cultured rat renal cortical cells. Both preparations showed a dose-dependent (0.11-1 ng/ml), time-dependent (peaking at 18 h), serum-dependent (7.5% of fetal calf serum or 10% castrated-hypo-physectomized rat serum) renotropic effect. Ovine TSH and FSH failed to mimic this specific, renotropic effect. We concluded that LH directly stimulates renal DNA synthesis in cooperation with other serum factor's.
Collapse
Affiliation(s)
- K Nomura
- Department of Medicine, Tokyo Women's Medical College, Japan
| | | | | | | | | | | |
Collapse
|
8
|
Green ED, Baenziger JU. Asparagine-linked oligosaccharides on lutropin, follitropin, and thyrotropin. I. Structural elucidation of the sulfated and sialylated oligosaccharides on bovine, ovine, and human pituitary glycoprotein hormones. J Biol Chem 1988. [DOI: 10.1016/s0021-9258(19)57351-3] [Citation(s) in RCA: 104] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
9
|
Green ED, Baenziger JU. Oligosaccharide specificities of Phaseolus vulgaris leukoagglutinating and erythroagglutinating phytohemagglutinins. Interactions with N-glycanase-released oligosaccharides. J Biol Chem 1987. [DOI: 10.1016/s0021-9258(18)45312-4] [Citation(s) in RCA: 79] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
10
|
Anouassi A, Combarnous Y, Lecompte F, Cahoreau C, Guillou F. Purification and characterization of luteinizing hormone from the dromedary (Camelus dromedarius). Biochimie 1987; 69:647-54. [PMID: 3120799 DOI: 10.1016/0300-9084(87)90184-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Luteinizing hormone (LH) has been purified from 150 dromedary pituitaries and its partial physicochemical, biological and immunological characterization has been achieved. Purification of the hormone was monitored by a porcine LH radioreceptor assay (RRA). In this system, the final camLH preparation exhibited an activity 0.6-fold that of highly purified porcine LH. The acid half-dissociation of camLH at equilibrium was observed at pH 4.2. A homologous camLH RRA was developed using the testicular plasma membrane fraction from prepubertal camels and radioiodinated, highly-purified camLH. Pituitary and chorionic gonadotropins (CG) from several mammalian species were compared to camLH in this system. The equine gonadotropins eLH and eCG were shown to be 6 times less potent in the camel RRA than in the porcine RRA, whereas the LH from other species exhibited similar activities in both systems. This particularity of camel LH receptors offers a new tool for the study of structural features of gonatropin interactions with their receptors.
Collapse
Affiliation(s)
- A Anouassi
- Institut National de la Recherche Agronomique, Unité Mécanismes d'Action des Hormones et Gamétogenèse, Nouzilly, France
| | | | | | | | | |
Collapse
|
11
|
Green ED, Boime I, Baenziger JU. Biosynthesis of sulfated asparagine-linked oligosaccharides on bovine lutropin. J Biol Chem 1986. [DOI: 10.1016/s0021-9258(18)66567-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
12
|
Green ED, Boime I, Baenziger JU. Differential processing of Asn-linked oligosaccharides on pituitary glycoprotein hormones: implications for biologic function. Mol Cell Biochem 1986; 72:81-100. [PMID: 3102943 DOI: 10.1007/bf00230637] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Luteinizing hormone, follicle-stimulating hormone, and thyroid-stimulating hormone from pituitary and chorionic gonadotropin from placenta are a family of glycoproteins, each consisting of an alpha and beta subunit. Within an animal species, the alpha subunit of all four hormones contains the identical amino acid sequence, while each beta subunit is distinct and confers biologic specificity to the hormone dimer. Despite sharing common alpha subunits, these hormones bear Asn-linked oligosaccharides which differ in structure. Whereas chorionic gonadotropin contains exclusively neutral and sialylated oligosaccharides, the pituitary hormones bear neutral, sialylated, sulfated, and sialylated/sulfated structures. The sulfated oligosaccharides are unique in structure and are more prevalent on certain pituitary hormones, indicating that the synthesis of these unusual oligosaccharides is tightly regulated. The differences in oligosaccharide structures in conjunction with the highly specific endocrine responses elicited by these hormones, suggest an important functional role for the oligosaccharides, such as metabolic clearance, control of hormone response, modulation of hormone potency, and/or intracellular sorting of hormones into separate secretory granules.
Collapse
|
13
|
Green ED, Baenziger JU. Separation of anionic oligosaccharides by high-performance liquid chromatography. Anal Biochem 1986; 158:42-9. [PMID: 3799968 DOI: 10.1016/0003-2697(86)90585-3] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
We have developed methods for rapid fractionation of anionic oligosaccharides containing sulfate and/or sialic acid moieties by high-performance liquid chromatography (HPLC). Ion-exchange HPLC on amine-bearing columns (Micropak AX-10 and AX-5) at pH 4.0 is utilized to separate anionic oligosaccharides bearing zero, one, two, three, or four charges, independent of the identity of the amnionic moieties (sulfate and/or sialic acid). Ion-exchange HPLC at pH 1.7 allows separation of neutral, mono-, di-, and tetrasialylated, monosulfated, and disulfated oligosaccharides. Oligosaccharides containing three sialic acid residues and those bearing one each of sulfate and sialic acid, however, coelute at pH 1.7. Since the latter two oligosaccharide species separate at pH 4.0, analysis at pH 4.0 followed by analysis at pH 1.7 can be utilized to completely fractionate complex mixtures of sulfated and sialylated oligosaccharides. Ion-suppression amine adsorption HPLC has previously been shown to separate anionic oligosaccharides on the basis of net carbohydrate content (size). In this study we demonstrate the utility of ion-suppression amine adsorption HPLC for resolving sialylated oligosaccharide isomers which differ only in the linkages of sialic acid residues (alpha 2.3 vs alpha 2.6) and/or location of alpha 2,3- and alpha 2,6-linked sialic acid moieties on the peripheral branches of oligosaccharides. These two methods can be used in tandem to separate oligosaccharides, both analytically and preparatively, based on their number, types, and linkages of anionic moieties.
Collapse
|
14
|
Combarnous Y, Guillou F, Martinat N. Functional states of the luteinizing hormone/choriogonadotropin-receptor complex in rat Leydig cells. J Biol Chem 1986. [DOI: 10.1016/s0021-9258(19)62696-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
15
|
Green ED, van Halbeek H, Boime I, Baenziger JU. Structural elucidation of the disulfated oligosaccharide from bovine lutropin. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(17)36304-4] [Citation(s) in RCA: 109] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
16
|
Cell-free sulfation of human and bovine pituitary hormones. Comparison of the sulfated oligosaccharides of lutropin, follitropin, and thyrotropin. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(17)36305-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|
17
|
Green ED, Morishima C, Boime I, Baenziger JU. Structural requirements for sulfation of asparagine-linked oligosaccharides of lutropin. Proc Natl Acad Sci U S A 1985; 82:7850-4. [PMID: 3865202 PMCID: PMC390867 DOI: 10.1073/pnas.82.23.7850] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Human and bovine pituitary glycoprotein hormones (lutropin, follitropin, and thyrotropin) contain varying amounts of N-acetylgalactosamine and sulfate. The sulfate on asparagine-linked oligosaccharides of bovine lutropin (bLH) is present exclusively on GalNAc in the sequence GalNAc(beta 1-4)GlcNAc(beta 1-2)Man alpha. We have examined the structural requirements for sulfation of bLH oligosaccharides by using a reconstituted cell-free system. After cleavage from the protein, oligosaccharides containing the sequence GalNAc(beta 1-4)Glc-NAc(beta 1-2)Man alpha were sulfated by enzymes in pituitary membranes. Addition of one or two sulfates was observed, depending upon the number of GalNAc acceptor sites on the oligosaccharide. Neither GalNAc alone nor oligosaccharides devoid of GalNAc were sulfated. Membranes from placenta or liver did not sulfate oligosaccharides released from bLH, indicating that the sulfating activity is pituitary-specific. The lack of peptide dependence for sulfation, in conjunction with the oligosaccharide specificity, suggests that the sequence GalNAc(beta 1-4)GlcNAc(beta 1-2)Man alpha contains the recognition signal for the sulfotransferase(s).
Collapse
|
18
|
Hallin P, Madej A, Edqvist LE. Subunits of bovine lutropin. Hormonal and immunological activity after separation with reversed-phase high-performance liquid chromatography. J Chromatogr A 1985; 319:195-204. [PMID: 3980634 DOI: 10.1016/s0021-9673(01)90554-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
By means of reversed-phase high-performance liquid chromatography, we have fractionated bovine lutropin (LH) standard preparations. The highly purified NIAMDD-bLH-4 was fractionated into two components, while the less pure NIH-LH-B9 revealed three distinct peaks. The eluted material was further characterized by in vitro bioassay and by homologous radioimmunoassay for bovine LH, ovine LH-alpha and ovine LH-beta subunits. The material with the shortest retention time possessed almost no LH-activity and showed a displacement curve nearly identical with that of the ovine LH-alpha subunit. The material corresponding to the second peak exhibited 6% of the original LH-activity, and its immunoreactivity was equal to that of the ovine LH-beta subunit. Furthermore, the fractions supposed to contain the alpha and the beta subunits were rechromatographed and their aminoacid contents analyzed. The results show close similarities between the rechromatographed fractions and the pure subunits.
Collapse
|
19
|
Buettner K, Ascoli M. Na+ modulates the affinity of the lutropin/choriogonadotropin receptor. J Biol Chem 1984. [DOI: 10.1016/s0021-9258(17)42516-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
20
|
Green ED, Gruenebaum J, Bielinska M, Baenziger JU, Boime I. Sulfation of lutropin oligosaccharides with a cell-free system. Proc Natl Acad Sci U S A 1984; 81:5320-4. [PMID: 6591193 PMCID: PMC391695 DOI: 10.1073/pnas.81.17.5320] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Sulfate is covalently linked to the oligosaccharides on the alpha and beta subunits of bovine lutropin (luteinizing hormone; LH) but not to those on human chorionic gonadotropin (hCG). Since the amino acid sequences of the pituitary and placental alpha subunits are homologous, comparison of their asparagine-linked sugars can provide information regarding tissue specificity of oligosaccharide maturation. To characterize this post-translational modification, we have developed a reconstituted cell-free sulfation system. Sulfate is incorporated into exogenously added glycoproteins by sulfotransferases from Triton X-100-lysed Golgi membranes in the presence of 3'-phosphoadenosine 5'-phospho[35S]sulfate, which is generated from [35S]sulfate by a ribosome-free supernate from Krebs ascites tumor cells. LH is sulfated by pituitary and liver membranes but not by those from placenta. Desialylated hCG (AshCG) is sulfated by membranes from placenta and pituitary, but not liver, while hCG is not sulfated by any of these membranes. Endoglycosidase F releases all the incorporated sulfate from LH in the form of a heterogeneous mixture of mono- and disulfated oligosaccharides. In contrast, the sulfate added to AshCG is apparently attached to peptide rather than oligosaccharide. As found with the cell-free system, sulfate metabolically incorporated into LH by pituitary cells is present on a heterogeneous population of mono- and disulfated oligosaccharides. Thus the cell-free sulfation system accurately duplicates the in vivo process.
Collapse
|
21
|
Nomura K, Puett D, Nicholson WE, Liddle GW. Partial purification and characterization of a renotropic fraction from ovine pituitaries. Proc Natl Acad Sci U S A 1982; 79:6675-9. [PMID: 6815657 PMCID: PMC347191 DOI: 10.1073/pnas.79.21.6675] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
It has been previously established that hypophysectomy leads to renal atrophy in rats and that a crude pituitary-derived fraction is effective in restoring kidney weight to the level expected for intact animals of the same body weight. This paper reports that considerable purification of the crude renotropic fraction from ovine pituitaries has been achieved and that the purified fraction is capable of restoring kidney weights of hypophysectomized castrated rats to normal values. For example, after five daily subcutaneous injections (135 micrograms/day) there were significant increases in dry kidney weight and total renal protein and DNA. The pituitary-derived fraction was devoid of somatotropin, contained only trace amounts of corticotropin, gamma-lipotropin, vasopressin, and prolactin, and had only low levels of thyrotropin and follitropin. Daily injections of prolactin, thyrotropin, and follitropin in doses of 20 micrograms each failed to stimulate renal growth in hypophysectomized rats. Thus, it seems highly unlikely that these factors are responsible for the observed renal hyperplasia after treatment with the pituitary fraction. The purified renotropic fraction had an isoelectric pH between 8 and 9. On polyacrylamide gel electrophoresis in the presence of detergent and a reducing agent, the renotropic fraction exhibited two major bands and one minor band with mobilities that corresponded to those of a standard lutropin preparation. The renotropic fraction exhibited considerable crossreactivity with an antiserum directed against the lutropin alpha subunit, suggesting the presence of the common glycoprotein hormone subunit. Moreover, the purified fraction stimulated steroid production by Leydig tumor cells in vitro. It is noteworthy, however, that standard ovine lutropin at 135 micrograms/day failed to exhibit renotropic activity in hypophysectomized castrated rats, although effects were noted at twice that dose. It appears that the renotropic activity represents a pituitary substance that can be separated from lutropin only with difficulty.
Collapse
|
22
|
Sairam MR. Effects of carbohydrate removal on the structure and activity of bovine lutropin. BIOCHIMICA ET BIOPHYSICA ACTA 1982; 717:149-53. [PMID: 6285988 DOI: 10.1016/0304-4165(82)90392-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Bovine lutropin was successfully deglycosylated by treatment with anhydrous HF at 0 degrees C for 60 min. The overall loss of carbohydrate residues was about 70%. Fucose, mannose and galactosamine residues were removed completely. About six residues of N-acetylglucosamine were left in the deglycosylated hormone. This degree of deglycosylation did not reduce receptor binding ability but in vitro biological activity was completely lost. Consistent with these properties, the deglycosylated lutropin inhibited the in vitro biological action of the native lutropin. The results demonstrate that the full complement of carbohydrate residues including the sulfated hexosamines are not required for receptor binding but they are necessary to impart appropriate conformational features necessary for activation of the target cells.
Collapse
|
23
|
Strickland TW, Puett D. The kinetic and equilibrium parameters of subunit association and gonadotropin dissociation. J Biol Chem 1982. [DOI: 10.1016/s0021-9258(19)81057-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
24
|
Bahl OP, Reddy MS, Bedi GS. A novel carbohydrate structure in bovine and ovine luteinizing hormones. Biochem Biophys Res Commun 1980; 96:1192-9. [PMID: 7437064 DOI: 10.1016/0006-291x(80)90078-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|
25
|
Burke WH, Papkoff H, Licht P, Gallo AB. Preparation and properties of luteinizing hormone (LH) subunits from the turkey (Meleagris gallopavo) and their recombination with subunits of ovine LH. Gen Comp Endocrinol 1979; 37:501-7. [PMID: 456885 DOI: 10.1016/0016-6480(79)90032-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
26
|
Bona Gallo A, Licht P. Differences in the properties of FSH and LH binding sites in the avian gonad revealed by homologous radioligands. Gen Comp Endocrinol 1979; 37:521-32. [PMID: 222647 DOI: 10.1016/0016-6480(79)90034-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
27
|
MacKenzie DS, Licht P, Papkoff H. Thyrotropin from amphibian (Rana catesbeiana) pituitaries and evidence for heterothyrotropic activity of bullfrog luteinizing hormone in reptiles. Gen Comp Endocrinol 1978; 36:566-74. [PMID: 220138 DOI: 10.1016/0016-6480(78)90097-7] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
28
|
Bloomfield GA, Faith MR, Pierce JG. Sepharose-linked concanavalin A in the purification and characterization of glycoprotein hormones of the bovine pituitary. BIOCHIMICA ET BIOPHYSICA ACTA 1978; 533:371-82. [PMID: 647015 DOI: 10.1016/0005-2795(78)90383-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Affinity chromatography on concanavalin A-Sepharose is a time saving step in both large and small scale isolations of the bovine pituitary glycoprotein hormones. After ion-exchange chromatography, the final yield of purified lutropin is 40-50% of material in starting concentrates and of purified thyrotropin is approximately 20%. The final products have the same electrophoretic and immunological properties and amino acid compositions as previous preparations. Less than 3% of the immunoreactive lutropin, follitropin and thyrotropin are present as non-glycosylated forms in either crude pituitary extracts or concentrates. Thyrotropin and follitropin elute from the immobilized lectin as a single fraction, whereas lutropin separates into two glycosylated fractions. Gel filtration of both crude extracts and the glycoprotein fractions shows that less than 5% of the immunoreactivity of the hormones is present as material of apparently high molecular weight. Substantial alpha subunit immunoreactivity, however, is in three fractions (as found by others in human pituitary extracts) corresponding to "high molecular weight material" (7%), intact hormones (46%) and free subunit (47%).
Collapse
|
29
|
Farmer SW, Suyama A, Papkoff H. Effect of diverse mammalian and nonmammalian gonadotropins on isolated rat Leydig cells. Gen Comp Endocrinol 1977; 32:488-94. [PMID: 902982 DOI: 10.1016/0016-6480(77)90232-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
30
|
Papkoff H, Farmer SW, Licht P. Isolation and characterization of luteinizing hormone from amphibian (Rana catesbeiana) pituitaries. Life Sci 1976; 18:245-50. [PMID: 1082969 DOI: 10.1016/0024-3205(76)90031-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
31
|
Ramachandran J, Sairam MR. The effects of interstitial cell-stimulating hormone, its subunits, and recombinants on isolated rat Leydig cells. Arch Biochem Biophys 1975; 167:294-300. [PMID: 165777 DOI: 10.1016/0003-9861(75)90465-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
32
|
Liu WK, Ward DN. The purification and chemistry of pituitary glycoprotein hormones. PHARMACOLOGY & THERAPEUTICS. PART B: GENERAL & SYSTEMATIC PHARMACOLOGY 1975; 1:545-70. [PMID: 772712 DOI: 10.1016/0306-039x(75)90053-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
33
|
Sairam MR, Li CH. A simple procedure for separating the subunits of ovine and bovine pituitary interstitial cell stimulating hormone. Arch Biochem Biophys 1974; 165:709-14. [PMID: 4441100 DOI: 10.1016/0003-9861(74)90299-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
34
|
Isolation and Characterization of the Subunits of Highly Purified Ovine Follicle-stimulating Hormone. J Biol Chem 1974. [DOI: 10.1016/s0021-9258(20)79877-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
35
|
Bewley TA, Sairam MR, Li CH. The kinetics of dissociation and reassociation of ovine pituitary interstitial cell stimulating hormone. Arch Biochem Biophys 1974; 163:625-33. [PMID: 4416339 DOI: 10.1016/0003-9861(74)90523-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
36
|
Isolation and Characterization of Subunits from Equine Pituitary Follicle-stimulating Hormone. J Biol Chem 1974. [DOI: 10.1016/s0021-9258(19)42603-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
37
|
Jutisz M, Tertrin-Clary C. Luteinizing hormone and human chorionic gonadotropin: structure and activity. CURRENT TOPICS IN EXPERIMENTAL ENDOCRINOLOGY 1974; 2:195-246. [PMID: 4364315 DOI: 10.1016/b978-0-12-153202-4.50014-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
38
|
Gospodarowicz D. A Comparative Study of the Lipolytic Activity of Thyroid-stimulating Hormone and Luteinizing Hormone. J Biol Chem 1973. [DOI: 10.1016/s0021-9258(19)44299-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
39
|
Papkoff H, Sairam MR, Farmer SW, Li CH. Studies on the structure and function of interstitial cell-stimulating hormone. RECENT PROGRESS IN HORMONE RESEARCH 1973; 29:563-90. [PMID: 4750593 DOI: 10.1016/b978-0-12-571129-6.50019-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
40
|
Ward DN, Reichert LE, Liu WK, Nahm HS, Hsia J, Lamkin WM, Jones N. Chemical studies of luteinizing hormone from human and ovine pituitaries. RECENT PROGRESS IN HORMONE RESEARCH 1973; 29:533-61. [PMID: 4750592 DOI: 10.1016/b978-0-12-571129-6.50018-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
41
|
Sairam MR, Papkoff H, Li CH. The primary structure of ovine interstitial cell-stimulating hormone. I. The -subunit. Arch Biochem Biophys 1972; 153:554-71. [PMID: 4676903 DOI: 10.1016/0003-9861(72)90374-8] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
42
|
Baker BL, Pierce JG, Cornell JS. The utility of antiserums to subunits of TSH and LH for immunochemical staining of the rat hypophysis. THE AMERICAN JOURNAL OF ANATOMY 1972; 135:251-67. [PMID: 4116889 DOI: 10.1002/aja.1001350210] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
43
|
Heterogeneity of Porcine Pituitary Luteinizing Hormone Subunits (LHα and LHβ) in 6 m Guanidine Hydrochloride Agarose Gel Chromatography. J Biol Chem 1972. [DOI: 10.1016/s0021-9258(19)45090-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
44
|
Donaldson EM, Yamazaki F, Dye HM, Philleo WW. Preparation of gonadotropin from salmon (Oncorhynchus tshawytscha) pituitary glands. Gen Comp Endocrinol 1972; 18:469-81. [PMID: 5034765 DOI: 10.1016/0016-6480(72)90028-7] [Citation(s) in RCA: 112] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
45
|
Closset J, Hennen G, Lequin RM. Isolation and properties of human luteinizing hormone subunits. FEBS Lett 1972; 21:325-329. [PMID: 11946538 DOI: 10.1016/0014-5793(72)80194-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- J Closset
- Section d'Endocrinologie, Département de Clinique et de Séméiologie médicales, Institut de Médecine, Université de Liège, Belgique
| | | | | |
Collapse
|
46
|
Courte C, Hurault M, Clary C, De la Llosa P, Jutisz M. Purification and physicochemical properties of bovine luteinizing hormone (LH) and comparison between bull and cow LH-preparations. Gen Comp Endocrinol 1972; 18:284-91. [PMID: 5062787 DOI: 10.1016/0016-6480(72)90213-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
47
|
Quelques points de structure de l'hormone lutéinisante bovine. Comparaison avec l'hormone lutéinisante ovine. ACTA ACUST UNITED AC 1972. [DOI: 10.1016/0005-2795(72)90165-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
48
|
Bewley TA, Sairam MR, Li CH. Circular dichroism of ovine interstitial cell stimulating hormone and its subunits. Biochemistry 1972; 11:932-6. [PMID: 5015610 DOI: 10.1021/bi00755a037] [Citation(s) in RCA: 76] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
49
|
Landefeld TD, Grimek HJ, McShan WH. End group and carbohydrate analyses of equine LH. Biochem Biophys Res Commun 1972; 46:463-9. [PMID: 5057887 DOI: 10.1016/s0006-291x(72)80161-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
50
|
Maghuin-Rogister GC, Hennen GP. Bovine luteinizing hormone. Study of the primary structure around the carbohydrate attachment sites of the luteinizing hormone alpha-subunit. EUROPEAN JOURNAL OF BIOCHEMISTRY 1971; 21:489-97. [PMID: 5107231 DOI: 10.1111/j.1432-1033.1971.tb01494.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|