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Miano A, Quassinti L, Maccari E, Murri O, Amici D, Bramucci M. Purified angiotensin converting enzyme from Rana esculenta ovary influences ovarian steroidogenesis in vitro. J Physiol Biochem 2003; 59:269-76. [PMID: 15164946 DOI: 10.1007/bf03179884] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The aim of the present study was to purify and characterize angiotensin-converting enzyme (ACE) present in frog ovary (Rana esculenta). Detergent and trypsin-extracted enzymes were purified using a one-step process, consisting of affinity chromatography on lisinopril coupled to Sepharose 6B. The molecular mass was 150 kDa for both detergent-extracted and trypsin-extracted enzyme. The specific activity of detergent-extracted and trypsin-extracted ACE was 294 U mg(-1) and 326 U mg(-1) respectively. The optimum pH range was from 7-8.5 at 37 degrees C and the optimum temperature was 50 degrees C. Optimum chloride concentration was about 200 mM for synthetic substrate FAPGG (N-[3-(2-furyl)acryloyl] L-phenylalanyl glycyl glycine) and angiotensin I, and 10 mM for bradykinin. The Km and Kcat values for FAPGG were 0.608 +/- 0.07 mM and 249 sec(-1) respectively and I50 values for captopril and lisinopril, two specific ACE inhibitors, were 68 +/- 12.55 nM and 6.763 +/- 0.66 nM respectively. Frog ovary tissue from prereproductive period was incubated in vitro in the presence of frog ovary ACE (2.5 mU/ml), captopril (0.1 mM), and lisinopril (0.1 mM). Production of 17beta-estradiol, progesterone, and prostaglandins E2 and F2alpha was determined. The data showed a modulation of 17beta-estradiol, progesterone and prostaglandin E2 production by ovary ACE.
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Affiliation(s)
- A Miano
- Department of Molecular, Cellular and Animal Biology, University of Camerino, I-62032 Camerino, Italy
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Bramucci M, Miano A, Quassinti L, Maccari E, Murri O, Amici D. Degradation of thymic humoral factor gamma2 by human plasma: involvement of angiotensin converting enzyme. Regul Pept 2003; 111:199-205. [PMID: 12609769 DOI: 10.1016/s0167-0115(02)00284-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The degradation of thymic humoral factor-gamma2 (THF-gamma2), an immunoregulatory octapeptide important for T-lymphocyte regulation, by enzymes present in human plasma, was investigated. THF-gamma2 was metabolized through two steps that involved the detaching of N-terminal amino acid leucine followed by hydrolysis of the Lys(6)-Phe(7) bond. The THF-gamma2 cleavages were sensitive to aminopeptidase and metalloproteinase inhibitors. The degradation was completely blocked by amastatin and specific inhibitors of angiotensin converting enzyme (ACE). The cleavages occurred independently, with two different kinetics, faster for the N-terminal hydrolysis than for that of the Lys(6)-Phe(7) bond. Purified human plasma ACE was used to characterize the hydrolysis of Lys(6)-Phe(7) bond. The K(m) and K(cat) values for THF-gamma2 hydrolysis were 0.273 mM and 107 s(-1), respectively. The optimum of chloride concentration was 300 mM, while that of pH was 7.6. The presence of ACE in circulating mononuclear cells raises the possibility that it may play a role in modulating the THF-gamma2 activity.
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Affiliation(s)
- M Bramucci
- Department of Molecular, Cellular and Animal Biology, University of Camerino, Via F Camerini, 2, I-62032 Camerino (MC), Italy.
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Bramucci M, Miano A, Gobbetti A, Zerani M, Quassinti L, Maccari E, Murri O, Amici D. Bradykinin is not involved in angiotensin converting enzyme modulation of ovarian steroidogenesis and prostaglandin production in frog Rana esculenta. Acta Physiol Scand 2002; 175:123-8. [PMID: 12028132 DOI: 10.1046/j.1365-201x.2002.00983.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Angiotensin converting enzyme (ACE) was demonstrated to modulate the production of 17beta-estradiol, progesterone and prostaglandin E2 (PGE2) in frog ovary of Rana esculenta. However, the activity was not mediated by angiotensin II (Ang II). In an attempt to identify the peptide involved in the pathway modulated by ACE, bradykinin, another physiological substrate of ACE, was chosen and incubated in the presence of the membrane suspension purified from the frog ovary homogenate. The hydrolytic products were analysed by reverse-phase high-pressure liquid chromatography (HPLC) analysis and the results showed that bradykinin was metabolized by membrane suspension. The presence of the protease inhibitors in the incubation mixture indicated ACE and neutral endopeptidase as being responsible for the bradykinin hydrolysis. Frog ovary was incubated in vitro in the presence of bradykinin (10 microM), bradykinin receptor antagonist NPC 567 (1 mg mL-1), bradykinin fragment (1-7) (10 microM), ACE (2.5 mU mL-1), captopril (0.1 mM) and lisinopril (0.1 mM). The results showed no modulating activity by bradykinin on ovarian 17beta-estradiol and PGE2 production, thus demonstrating that it was not involved in the ACE-modulated pathway.
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Affiliation(s)
- M Bramucci
- Department of Molecular, Cellular and Animal Biology, University of Camerino, Italy
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Bramucci M, Miano A, Quassinti L, Murri O, Amici D. Synthesis and characterization of tetramethylrhodaminethiocarbamoyl-(Glu(1))-epidermal mitosis-inhibiting pentapeptide. Regul Pept 2001; 102:111-7. [PMID: 11730983 DOI: 10.1016/s0167-0115(01)00308-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A fluorescent analog of epidermal mitosis-inhibiting pentapeptide (pGlu-Glu-Asp-Ser-Gly) was synthesized by reacting tetramethylrhodamine isothiocyanate with ring-opened epidermal mitosis-inhibiting pentapeptide. The ring-opening reaction of the pyrrolidone moiety was performed with mild acidic hydrolysis and the product purified by reversed-phase high-performance liquid chromatography. Tetramethylrhodaminethiocarbamoyl-(Glu(1))-epidermal mitosis-inhibiting pentapeptide was purified by chromatography on Sephadex G-25 and reversed-phase high-performance liquid chromatography. After characterization by amino acid analysis, the analog was incubated in presence of A431 cell line to visualize the cellular localization of the epidermal mitosis-inhibiting pentapeptide. The data gave negative results.
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Affiliation(s)
- M Bramucci
- Department of Molecular, Cellular and Animal Biology, University of Camerino, Via F. Camerini n. 2, I-62032 Camerino (MC), Italy
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Miano A, Gobbetti A, Zerani M, Quassinti L, Maccari E, Murri O, Amici D, Bramucci M. Different modulation of aromatase activity in frog testis in vitro by ACE and ANG II. Am J Physiol 1999; 277:R1261-7. [PMID: 10564195 DOI: 10.1152/ajpregu.1999.277.5.r1261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The aim of the present research was to study the role of angiotensin-converting enzyme (ACE) and ANG II in amphibian (Rana esculenta) testicular steroidogenesis and prostaglandin production. Hormonal effects of ACE, ACE inhibitors, synthetic bullfrog ANG I, and [Val(5)]ANG II were determined in frog testis of prereproductive period. Production of 17beta-estradiol, progesterone, androgens, and PGE(2) and PGF(2alpha) was determined by incubating frog testes with ACE (2.5 mU/ml), captopril (0.1 mM), lisinopril (0.1 mM), [Val(5)]ANG II (1 microM), and synthetic bullfrog ANG I (1 microM). The analysis of the data showed an independent modulation of 17beta-estradiol and androgen production by ACE and ANG II. The ACE pathway caused a decrease of 17beta-estradiol production and an increase of androgen production in frog testes; on the other hand, the ANG II pathway increased 17beta-estradiol production and decreased androgen production. The determination of testicular aromatase activity showed a positive regulation by ANG II and a negative regulation by ACE. As for prostaglandin production, only ANG II influenced PGF(2alpha). These results suggest a new physiological role of ACE and ANG II in modulating steroidogenesis and prostaglandin production.
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Affiliation(s)
- A Miano
- Department of Molecular, University of Camerino, I-62032 Camerino, Italy.
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Bramucci M, Miano A, Quassinti L, Maccari E, Murri O, Amici D. Presence and comparison of angiotensin converting enzyme in commercial cell culture sera. Biochem Mol Biol Int 1999; 47:107-15. [PMID: 10092950 DOI: 10.1080/15216549900201103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
This study was conducted to determine the presence of the angiotensin converting enzyme in commercial sera used in cell culture medium. The aim of the research was to bring the presence of proteinases (angiotensin converting enzyme) to cell culture users' knowledge and to give some data for solving problems about the development of peptides as useful drugs. The enzymes, purified from foetal bovine, adult bovine, foetal equine, adult equine, and human sera, showed molecular weights of about 170 kDa. Captopril and lisinopril inhibited enzyme activities at nanomolar concentrations. The enzymes were able to hydrolyze, with different efficiency, angiotensin I, bradykinin and epidermal mitosis inhibiting pentapeptide. The heat inactivation of commercial sera at 56 degrees C for 30 min showed a reduction of ACE activity of about 35-80%. Therefore, the presence of ACE activity in commercial sera can influence the activity of biological peptides tested on cell lines cultured "in vitro."
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Affiliation(s)
- M Bramucci
- Department of Molecular, Cellular and Animal Biology, University of Camerino, Italy
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Bramucci M, Miano A, Gobbetti A, Zerani M, Quassinti L, Maccari E, Murri O, Amici D. Different modulation of steroidogenesis and prostaglandin production in frog ovary in vitro by ACE and ANG II. Am J Physiol 1997; 273:R2089-96. [PMID: 9435665 DOI: 10.1152/ajpregu.1997.273.6.r2089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Our aim was to study the role of angiotensin-converting enzyme (ACE) and angiotensin II (ANG II) on ovarian steroidogenesis and prostaglandin production of amphibian. Hormonal effects of ACE, ACE inhibitors, synthetic bullfrog angiotensin I (ANG I), and [Val5]ANG II were compared on frog ovaries of postreproductive and prereproductive periods. Very high ACE activity was found in ovary of water frog (Rana esculenta) compared with other frog tissues, and this activity was inhibited by the typical ACE inhibitors, captopril and lisinopril. Frog ovary tissue in postreproductive and prereproductive periods was incubated in vitro in the presence of ACE (2.5 mU/ml), captopril (0.1 mM), lisinopril (0.1 mM), [Val5]ANG II (1 microM), and synthetic bullfrog ANG I (1 microM). Production of 17 beta-estradiol, progesterone, androgens, and prostaglandins E2 and F2 alpha was determined. The data showed a modulation of 17 beta-estradiol, progesterone, and prostaglandin E2 production by ovary ACE; on the other hand, [Val5]ANG II modulated the production of progesterone and prostaglandin F2 alpha, whereas androgen production was not influenced. The present in vitro studies suggest the existence of two pathways independently regulated by ACE and ANG II modulating ovarian steroidogenesis and prostaglandin production.
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Affiliation(s)
- M Bramucci
- Department of Molecular, Cellular and Animal Biology, University of Camerino, MC, Italy
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Miano A, Bramucci M, Murri O, Quassinti L, Maccari E, Zerani M, Gobbetti A, Amici D. Presence of angiotensin converting enzyme (ACE) activity in serum of amphibian: comparison with ACE activity of mammalian serum. Acta Physiol Scand 1997; 160:277-82. [PMID: 9246391 DOI: 10.1046/j.1365-201x.1997.00147.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The occurrence of angiotensin converting enzyme (EC 3.4.15.1; ACE) was demonstrated for the first time in serum of newt (Triturus carnifex) and frog (Rana esculenta). The enzymatic activity was evidenced following hydrolysis of N-[3-(2-furyl) acryloyl]L-phenylalanyl glycyl glycine (FAPGG), a synthetic substrate of ACE. The serum enzyme liberated N-[3-(2-furyl) acryloyl]L-phenylalanine (FAP) from FAPGG. The properties of the amphibian serum enzymes were compared with those of swine. The amphibian serum FAPGG hydrolysing activities were inhibited by typical ACE inhibitors, captopril and lisinopril. The optimum of pH was 8.3 at 10 and 37 degrees C and the temperature optimum was 45 degrees C. The values were similar to those of swine serum. The FAPGG Michaelis-Menten constants (K(m)) at 37 degrees C of amphibian serum enzymes (0.337 mM and 0.282 mM for frog and newt, respectively) were lower than that of swine (1.305 mM), but close to human serum enzyme. The K(m) values obtained at 10 degrees C were lower than those at 37 degrees C (0.152, 0.086, and 1.029 mM for frog, newt, and swine serum, respectively). Amphibian sera hydrolysed bullfrog synthetic angiotensin I to produce angiotensin II. Captopril (50 microM) inhibited the production of angiotensin II.
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Affiliation(s)
- A Miano
- Department of Molecular, Cellular and Animal Biology, University of Camerino, Italy
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Gobbetti A, Zerani M, Miano A, Bramucci M, Murri O, Amici D. Presence of pituitary adenylate cyclase-activating polypeptide 38-immuno-like material in the brain and ovary of the female crested newt, Triturus carnifex: its involvement in the ovarian synthesis of prostaglandins and steroids. J Endocrinol 1997; 152:141-6. [PMID: 9014849 DOI: 10.1677/joe.0.1520141] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The presence of pituitary adenylate cyclase-activating peptide (PACAP) 38-immuno-like material (PACAP 38-IL) in the brain and ovary of the crested newt, Triturus carnifex, and its action on ovarian steroidogenesis and prostaglandin synthesis were evaluated. The HPLC, brain and ovary extract peaks that eluted like PACAP 38 were considered PACAP 38-like material. The concentrations of PACAP 38-II in the HPLC extracts were measured by RIA. T. carnifex ovary was incubated with PACAP 38, brain and ovary PACAP 38-IL, and inhibitors of cyclooxygenase (COX), adenylate cyclase (AC) and phospholipase C (PLC) for 30 and 60 min. PACAI 38, and brain and ovary PACAP 38-IL increased prostaglandin E2 (PGE2) (30 and 60 min), and progesterone and corticosterone (60 min), but decreased oestradiol-17 beta (60 min). COX and PLC inhibitors counteracted the increases in PGE2, progesterone and corticosterone and the decrease in oestradiol-17 beta, and the AC, inhibitor also counteracted them except for PGE2. These results suggest that PACAP 38-IL, present in T. carnifex brain and ovary, acts on PLC, inducing the increase of PGE2 which, in turn, acting on AC, induces increases in progesterone and corticosterone and a decrease in oestradiol-17 beta.
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Affiliation(s)
- A Gobbetti
- Department of Molecular, Cellular and Animal Biology, University of Camerino, Italy
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Bramucci M, Miano A, Quassinti L, Maccari E, Canofeni S, Amici D. Purification and characterisation of swine serum proteinase which hydrolyses epidermal inhibitory pentapeptide. Biochim Biophys Acta 1996; 1290:184-90. [PMID: 8645722 DOI: 10.1016/0304-4165(96)00018-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In this paper we describe the purification to molecular homogeneity of the enzyme that cleaves the synthetic epidermal mitosis-inhibiting pentapeptide (pyroGlu-Glu-Asp-Ser-Gly; EPP) from swine serum. Biochemical characterisation of the enzyme shows a glycoprotein with apparent molecular mass of 200 kDa. The Km and Kcat values for EPP hydrolysis are 0.624 mM and 694 s-1, respectively. Use of proteinase inhibitors shows the enzyme's metalloendopeptidase character. Moreover, captopril and lisinopril prevent the cleavage of EPP. The N-terminal amino-acid sequence of the purified protein corresponds to the N-terminal amino-acid sequence of swine kidney angiotensin-converting enzyme, a dipeptidyl carboxypeptidase (EC 3.4.15.1).
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Affiliation(s)
- M Bramucci
- Department of Molecular, Cellular and Animal Biology, University of Camerino, Italy
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Basso A, Piantanelli L, Rossolini G, Amici D, Gianfranceschi GL. Differential influence of a thymic extract on alpha- and beta-adrenoceptors of mouse brain cortex. Ann N Y Acad Sci 1994; 741:124-8. [PMID: 7825799 DOI: 10.1111/j.1749-6632.1994.tb23093.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
MESH Headings
- Animals
- Cerebral Cortex/metabolism
- Male
- Mice
- Mice, Inbred BALB C
- Mice, Nude
- Receptors, Adrenergic, alpha/drug effects
- Receptors, Adrenergic, alpha/metabolism
- Receptors, Adrenergic, beta/drug effects
- Receptors, Adrenergic, beta/metabolism
- Thymus Gland/physiology
- Tissue Extracts/pharmacology
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Affiliation(s)
- A Basso
- Gerontological Research Department, Italian National Research Centers on Aging (INRCA), Ancona
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Gianfranceschi GL, Czerwinski A, Angiolillo A, Marsili V, Castigli E, Mancinelli L, Miano A, Bramucci M, Amici D. Molecular models of small phosphorylated chromatin peptides. Structure-function relationship and regulatory activity on in vitro transcription and on cell growth and differentiation. Peptides 1994; 15:7-13. [PMID: 8015983 DOI: 10.1016/0196-9781(94)90163-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We previously reported the isolation of low molecular weight phosphorylated peptides from the chromatin of several tissues. The chromatin peptides show a regulatory activity on DNA in vitro transcription and on cell growth and differentiation. In this paper, we report a molecular model of the native peptides designed according to the structural information obtained by means of biochemical and mass spectrometry analysis: pyroGlu-Ala-Gly-Glu-Asp-Ser(P)-Asp-Glu-Glu-Asn. This or very similar sequences are present in many transcription factors; on the basis of the structural model we presented and of related protein sequences, we have synthesized the peptide pyroGlu-Asp-Asp-Ser-Asp-Glu-Glu-Asn. This peptide affects transcription rate in reconstituted systems in vitro and in isolated nuclei; moreover, it inhibits the growth of HL60 cells with a parallel stimulus of differentiation.
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Angiolillo A, Bramucci M, Marsili V, Panara F, Miano A, Amici D, Gianfranceschi GL. Phosphorylation of synthetic acidic peptides by casein kinase II: evidence for competition with phosphorylation of proteins involved in transcription. Mol Cell Biochem 1993; 125:65-72. [PMID: 8264574 DOI: 10.1007/bf00926836] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Phosphorylation of several synthetic acidic peptides by biochemically isolated casein kinase II (CKII) and by cellular and nuclear extracts containing CKII-like activity has been investigated. Especially the synthetic peptide pyroGlu-Asp-Asp-Ser-Asp-Glu-Glu-Asn comprising the carboxy-terminal acidic hepta-peptide of the largest subunit of RNA polymerase II was found to serve as an excellent substrate for purified CKII. Moreover, this peptide reduces the rate of 'in vitro' ATP-dependent stimulation of DNA transcription induced by the proteins in the extracts. Since the peptide itself is also significantly phosphorylated in such assays, it is supposed that it serves as a competitive substrate for the phosphorylation of proteins in the extracts whose phosphorylation seems to be a prerequisite for their activity in the transcription process. This points to the involvement of CKII and substrate(s) of CKII in the process of transcription.
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Affiliation(s)
- A Angiolillo
- Institute of Cell Biology, University of Perugia, Italy
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Piccinini G, Bramucci M, Maccari E, Miano A, Amici D, Gianfranceschi GL, Cardellini E. In vitro phosphorylation of proteins tightly bound to DNA by protein kinase NII. Int J Biochem 1993; 25:1035-9. [PMID: 8365545 DOI: 10.1016/0020-711x(93)90118-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
1. Highly purified DNA from calf thymus was phosphorylated with protein kinase NII. 2. Digestion with proteinase K of this DNA demonstrates proteins as phosphorylated component. 3. Gel filtration chromatography on Bio-Gel A-0.5m gel column shows a major protein peak between 50 and 70 kDa. 4. SDS gel electrophoresis, after hydrolysis, to digest completely DNA, shows three major phosphorylated bands corresponding to polypeptides of M(r) between 31 and 21 kDa. 5. After high voltage electrophoresis on TLC plates tryptic digested polypeptides show very similar phosphopeptides patterns.
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Affiliation(s)
- G Piccinini
- Department of MCA Biology, University of Camerino, Italy
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15
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Bramucci M, Miano A, Amici D. Epidermal inhibitory pentapeptide phosphorylated in vitro by calf thymus protein kinase NII is protected from serum enzyme hydrolysis. Biochem Biophys Res Commun 1992; 183:474-80. [PMID: 1550557 DOI: 10.1016/0006-291x(92)90506-g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In this paper, we demonstrate that synthetic epidermal mitosis inhibiting pentapeptide (pyroGlu-Glu-Asp-Ser-Gly) is phosphorylated in vitro at serine level by protein kinase NII isolated from calf thymus chromatin. A serum enzyme, which rapidly cleaves the synthetic epidermal mitosis inhibiting pentapeptide, also hydrolyses the synthetic transcription inhibiting pentapeptide (pyroGlu-Ala-Glu-Ser-Asn). The phosphorylated forms of both pentapeptides are protected from the serum enzyme activity.
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Affiliation(s)
- M Bramucci
- Department of Molecular, Cellular and Animal Biology, University of Camerino, Italy
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Rossolini G, Basso A, Piantanelli L, Tacconi R, Amici D, Gianfranceschi G. Neuroendocrine thymus and β-adrenergic responsiveness in aging mice. Arch Gerontol Geriatr 1992; 15 Suppl 1:311-8. [DOI: 10.1016/s0167-4943(05)80031-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Chillemi F, Lugaro G, Boari D, Cardellini E, Bramucci M, Miano A, Amici D, Gianfranceschi GL, Durban E. Acidic pentapeptide phosphorylated in vitro by calf thymus protein kinase NII binds to DNA in the presence of Mg2+ cations. FEBS Lett 1991; 291:67-70. [PMID: 1936253 DOI: 10.1016/0014-5793(91)81105-h] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The pentapeptide pyroGlu-Ala-Glu-Ser-Asn has been synthetized and phosphorylated in vitro at level of serine by protein kinase NII isolated from calf thymus chromatin. It is noteworthy that the calf thymus kinase NII shows a remarkable affinity for this peptide. The [32P]peptide is able to bind to several DNAs in the presence of Mg2+ (lambda phage, calf thymus, pBR540 plasmid). This binding appears not specific with regard to the type of DNA and its base sequence. These data support the hypothesis that phosphorylated acidic domains of nuclear nonhistone proteins could bind directly to DNA in the presence of Mg2+ cations.
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Affiliation(s)
- F Chillemi
- Department of Organic and Industrial Chemistry, University of Milan, Italy
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18
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Abstract
Low molecular weight peptides have been isolated by alkali extraction from deproteinized DNA of E. coli cells grown in the presence of radioactive glutamic acid or orthophosphate. The labeled peptides, purified by gel filtration chromatography on Sephadex G25 and G10, contain prevailingly glutamic acid, aspartic acid, glycine, serine and alanine. Electrophoretic studies at different pH show that some peptide fractions contain a phosphoric residue. The N-terminus of the phosphorylated peptides is apparently blocked and they were able to bind to DNA in the presence of Mg2+ ions. Moreover the acidic peptides extracted from E. coli DNA show a sharp activity in the control of lambda phage DNA transcription 'in vitro'.
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Affiliation(s)
- F Felici
- Department of Cell Biology, University of Camerino, Italy
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Amici D, Maraldi N, Marsili G, Palatroni P, Gianfranceschi GL. Regulatory activity of DNA-binding peptides on some metabolic pathways altered in aging. Mech Ageing Dev 1983; 23:215-34. [PMID: 6686271 DOI: 10.1016/0047-6374(83)90022-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The Smith theory, which describes aging as a consequence of damage at DNA transcription level, suggested to us the opportunity of studying the possible action of DNA-binding peptides from calf thymus on old rats. We previously demonstrated that this peptidic fraction exerts a regulative control on transcriptional activities of DNA in cell and cell-free systems. In order to verify the possible action of these low molecular weight peptides we chose a large range of metabolic and structural parameters which are altered in aging. The results obtained indicate the following conclusions. Lipids. The lipid levels of old rat liver and serum are altered compared with those of young rats; the administration of peptidic fraction to old rats reverses the lipid alterations observed. Glucides. In old rat liver the presence of glycogen is very scanty or completely absent; the animals treated with the peptides show an amount and distribution of glycogen similar to that of adult normal rats. ATP. The peptidic fraction causes in the old rats a marked increase of blood ATP, bringing the level in the range of values determined in young rats. DNA, RNA, proteins. The total synthesis rate of DNA, RNA and proteins in old rat liver is not influenced by the DNA-binding peptides. Vice versa the nucleic acids from liver nuclei of old rats given peptidic fraction contain a greater RNA component compared to control old rats. This result is confirmed by the strong increase of transcriptional activity of DNA for RNA polymerase caused by administration of peptidic fraction to old rats. This increased DNA transcription can be interpreted as a partial recovery of DNA transcriptional capacity which evidently might imply a restoration of impaired metabolic systems. The histochemical and stereological analyses of liver cell compartments confirm the biochemical data.
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Gianfranceschi GL, Barra D, Coderoni S, Paparelli M, Venanzi F, Amici D. DNA-binding peptides from rat liver and Novikoff hepatoma cells: quantitative level and possible biochemical differences. Mol Biol Rep 1983; 9:169-74. [PMID: 6685224 DOI: 10.1007/bf00775363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
DNA isolated from rat liver by intensive deproteinization with chloroform/isoamyl alcohol and phenol contains low molecular weight peptides in a quantity of about 20 micrograms/mg DNA. These peptides show high specific activity in inhibiting transcription in a reconstituted cell-free system with prokaryotic and eukaryotic RNA polymerase. Their level is markedly decreased in DNA prepared from Novikoff hepatoma cells. Moreover the amino acid analysis and the pattern of analytical separation by high performance liquid chromatography (HPLC) show some biochemical differences between DNA-binding peptides extracted from rat liver and Novikoff hepatoma cells. The possibility that carcinogenesis may involve mechanisms which lead to selective removal of some components of the DNA-binding peptides, is discussed.
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21
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Gianfranceschi GL, Barra D, Bossa F, Coderoni S, Paparelli M, Venanzi F, Cicconi F, Amici D. Small peptides controlling transcription in vitro are bound to chromatin DNA. Biochim Biophys Acta 1982; 699:138-48. [PMID: 6758850 DOI: 10.1016/0167-4781(82)90147-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Low-molecular-weight peptides are linked to the chromatin DNA of several tissues, from which they can be dissociated by alkaline extraction at pH 9.5. The level of the active peptide fraction ranges between 10 and 35 micrograms/mg DNA. The removal of peptides from DNA causes a relevant amplification of DNA template capacity for prokaryotic and eukaryotic RNA polymerases. Gel filtration on Sephadex G-25 or BioGel P4 shows that the chromatin peptide fraction from purified DNA migrates as a sharp peak with an elution volume corresponding to a molecular weight of about 1000. The chromatin peptides are further purified by Sephadex G-10 and high-performance liquid chromatography. Four active fractions are isolated, one of which shows very high inhibition activity on the RNA synthesis in vitro. The amino acid analysis and the inhibition mechanism of the purified peptides are reported.
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22
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Amici D, Barra D, Hillar M, Murri O, Cicconi F, Gianfranceschi GL. Isolation and characterization of DNA-binding peptides from the serum: inhibition of transcription and comparison with the tissue peptides. Mol Biol Rep 1982; 8:217-23. [PMID: 6298595 DOI: 10.1007/bf00776583] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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23
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Amici D, Gianfranceschi GL. Control of RNA and protein synthesis in phytohemagglutinin-stimulated human lymphocytes by chromatin peptides from calf thymus. Mol Biol Rep 1980; 6:225-8. [PMID: 6163075 DOI: 10.1007/bf00777529] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Low molecular weight peptides from calf thymus chromatin inhibit RNA and protein synthesis in Phytohemagglutinin-stimulated human lymphocytes. These results may be correlated to the controlling transcription activity by chromatin peptides in cell-free systems.
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24
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Brunetti M, Castaldi C, D'Amore F, Rivosecchi L, Amici D. [Modern trends in nocturnal paroxysmal hemoglobinuria. Clinical and ultrastructural aspects of 2 cases]. Minerva Med 1980; 71:2053-62. [PMID: 7402489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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25
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Gianfranceschi GL, Hillar M, Chan JT, Amici D. Low molecular weight peptidic fraction in the chromatin from normal and cancer cells: control of transcription. Mol Biol Rep 1980; 6:95-103. [PMID: 7412771 DOI: 10.1007/bf00778436] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
DNA isolated from cell nuclei by intensive deproteinization with chloroform/isoamyl alcohol and phenol extractons contains a low molecular weight peptidic fraction in a quantity of about 20 micrograms/mg DNA. These peptides were characterized by chromatography on CM-Sephadex, Sephadex G-25, high performance liquid chromatography on microBondapak C18 and amino acid composition. The peptides control transcription in a reconstituted cell-free system with prokaryotic and eukaryotic RNA polymerase and stabilize the structure of double stranded DNA, while increasing its melting point. Their level is markedly decreased (by about 40%) in DNA prepared from tumor cells as compared to normal cell DNA. Transcriptional studies showed only a slightly increased template activity of DNA extracted at pH 9.5 versus DNA extracted at pH 6.0 for DNA preparations from tumor cells. However, there was a marked increase in template activity for DNA preparations treated at pH 9.5 from normal cells--232%, 124%, 97% and 78% for rat liver, mouse liver, mouse thymus and fibroblast L-929 cells, respectively. Also there was no difference in the melting point between these two preparations of DNA from tumor cells; normal cell DNA preparations showed increased melting point of preparations treated at pH 6.5. The data obtained indicate that the loss of low molecular weight peptides from tumor DNA during carcinogenesis is responsible for uncontrolled gene expression observed in cancer.
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26
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Gianfranceschi GL, Hillar M, Przyjemski J, Amici D, Guglielmi L. Inhibition of exogenous mRNA translation in a cell-free system by chromatin peptides from calf thymus. Mol Biol Rep 1980; 6:27-9. [PMID: 7393223 DOI: 10.1007/bf00775750] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Low molecular weight chromatin peptides isolated from calf thymus by affinity chromatography on DNA-cellulose inhibit significantly translation of exogenous isolated mRNA in a reticulocyte cell-free system. Translation with endogenous mRNA present in the system is not inhibited by low peptide concentrations. The data obtained combined with the previous findings suggest that chromatin peptides control gene expression at two levels: transcription and translation.
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27
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Rossi GB, Cioe L, Pulciani S, Meo P, Titti F, Amici D, Gianfranceschi GL. Effects of a chromatin low molecular weight peptidic fraction on differentiation markers and virus production in Friend leukemia cells. Mol Biol Rep 1979; 5:241-9. [PMID: 93693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Low molecular weight chromatin peptides exert a dose-dependent inhibition of Dimethylsulfoxide (DMSO)-induced erythroid differentiation of murine Friend Leukemia Cells (FLC). This effect correlates with the degree of purification of the peptide fractions. Crot analysis of globin mRNA amounts in DMSO-treated FLC given the peptides showed a 4-5-fold decrease of messenger RNA in the cytoplasma with no nuclear storage of globin transcripts. Spectrin accumulation in "induced" FLC is inhibited as well. The effects of the peptides on erythroid markers are reversible upon removal of the compounds. They also appear to be specific for induced gene expression as (1) no effects are observed on cell growth and RNA synthesis in normal non-differentiating cell lines; and (2) no changes have been detected with regard to the expression of integrated viral genes coding for continuous shedding of viral particles.
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28
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Guglielmi L, Gianfranceschi GL, Venanzi F, Polzonetti A, Amici D. Specific thymic peptides-DNA interaction. Correlation with the possible stereochemical kinking scheme of DNA. Mol Biol Rep 1979; 4:195-201. [PMID: 35742 DOI: 10.1007/bf00777553] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Low molecular weight peptides from calf thymus cause a strong dose-dependent stabilization of the DNA. The strength od DNA-peptide interaction is pH-dependent and decreases repidly above pH 6.5. Moreover the complete kinetics of DNA denaturation and renaturation demonstrates that the peptide fraction increases significantly the DNA renaturation mostly at low temperature, showing that the interaction DNA-thymic effector helps the recombination of complementary DNA segments. The DNA stabilization rate by the peptide fraction is comparable to that obtained by means of high concentration of histones or synthetic polycationic peptides. However, the lack of basic amino acids in the peptide structure is not in favor of strong electrostatic interactions and implies a specific binding of peptide to DNA. The possible correlation of the specific thymic peptides-DNA interaction with the stereochemical kinking scheme of DNA is discussed.
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Gianfranceschi GL, Guglielmi L, Amici D, Bossa F, Barra D, Petruzzelli R. Low molecular weight peptides controlling transcription are present in the calf thymus chromatin structure. Mol Biol Rep 1977; 3:429-36. [PMID: 593273 DOI: 10.1007/bf00808384] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A calf thymus peptide fraction controlling DNA and chromatin template has been purified by DNA-cellulose and Dowex 50 WX2 chromatography and its amino acid composition determined. The active peptide fraction can be extracted in high pH buffer from calf thymus native chromatin previously deproteinized by chloroform-isamyl alcohol and phenol. These data demonstrate that the thymic peptide(s) is (are) a chromatin protein constituent strongly linked to DNA. The specificity in association of the peptide(s) to DNA has also been considered.
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30
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Amici D, Rossi GB, Cioé L, Matarese GP, Dolei A, Guglielmi L, Gianfranceschi GL. Low-molecular-weight peptide inhibits RNA synthesis in human leukemic and phytohemagglutinin-stimulated leukocytes and globin mRNA transcription in differentiating Friend cells. Proc Natl Acad Sci U S A 1977; 74:3869-73. [PMID: 269438 PMCID: PMC431764 DOI: 10.1073/pnas.74.9.3869] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The RNA synthesis of human leukemic leukocytes and phytohemagglutinin-stimulated lymphocytes is markedly reduced by administration of a low-molecular-weight nonhistone peptide factor from calf thymus. Treatment with the factor strongly inhibits hemoglobin production and globin mRNA transcription in dimethyl sulfoxide-stimulated Friend cells without appreciably modifying the rate of cell growth. Evidence for specificity of these effects is provided by the lack of action of the factor on both growth rate and RNA synthesis of a number of nondifferentiating cell lines from various animal species. After removal of the compound, both human lymphocytes and Friend cells can be stimulated by phytohemagglutinin and by dimethyl sulfoxide, respectively, ruling out any toxic effect.
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Tedeschi GG, Amici D, Sprovieri G, Vecchi A. Staphylococcus epidermidis in the circulating blood of normal and thrombocytopenic human subjects: immunological data. Experientia 1976; 32:1600-2. [PMID: 798697 DOI: 10.1007/bf01924475] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Immunological studies, performed with human sera and rabbit antisera upon some strains of Staph. epidermidis carried in the circulating blood of normal and thrombocytopenic subjects, indicate that the reactivity is very low and almost completely related to antigenic properties common to Staph. aureus.
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32
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Gianfranceschi GL, Amici D, Guglielmi L. Stabilization of double-stranded DNA molecule by non-histone peptidic effector from calf thymus. Mol Biol Rep 1976; 3:55-64. [PMID: 1034203 DOI: 10.1007/bf00357209] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A peptidic effector from calf thymus causes a strong stabilization of DNA double-stranded molecule in vitro. The active factor was isolated from aqueous ultrafiltered thymus extracts and purified by means of chromatography on DEAE-cellulose and then on Dowex 50 WX2. The purified thymic factor was characterized as a peptide of low molecular weight (less than 5000). The biological activity of the thymic factor cannot be attributed to a histone fragment. Melting data of the control DNA and of the DNA-active factor complex in various conditions of ionic strength and dielectric constant of the solution medium are recorded.
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33
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Gianfranceschi GL, Amici D, Guglielmi L. Restriction of template capacity of rat liver chromatin by a non-histone peptide from calf thymus. Nature 1976; 262:622-3. [PMID: 958432 DOI: 10.1038/262622a0] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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34
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Abstract
In human foetal blood the presence of Micrococcaceae in the unstable L-form, probably taking origin from the placental transmission of minimal reproductive units, has been recognized by means of microscopic and cultural methods.
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Gianfranceschi GL, Amici D, Guglielmi L. Evidence for the presence in calf thymus of a peptidic factor controlling DNA transcription in vitro. Biochim Biophys Acta 1975; 414:9-19. [PMID: 1191703 DOI: 10.1016/0005-2787(75)90121-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A thymic factor causes a strong inhibition of the DNA-directed RNA polymerase reaction in vitro. The active factor was isolated from aqueous ultrafiltered thymus extracts and purified by means of chromatography on DEAE-cellulose and then on Dowex 50 WX2. The purified thymic factor was characterized as a peptide of low molecular weight (less than 5000). The biological activity of the thymic factor cannot be attributed to the presence of a nuclease or of a histone fragment. The RNA synthesis is controlled by this factor by means of electrostatic interactions between the peptide compound and DNA. Inhibitory activity on RNA synthesis was absent from kidney extracts.
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36
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Amici D, Gianfranceschi GL, Guglielmi L. Regulation by thymus extracts of RNA synthesis in spleen cells "in vitro". Boll Soc Ital Biol Sper 1975; 51:1497-500. [PMID: 1231835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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37
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Tedeschi GG, Amici D, Santarelli I. L- and conventional forms of micrococci in the circulating blood of thrombocytopenic patients. Experientia 1975; 31:1088-9. [PMID: 1236808 DOI: 10.1007/bf02326975] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The multiplication of Gram-positive Cocci originating from L-forms carried by platelets of autoimmune thrombocytopenic patients, may be attributed to the primary platelet damage enhanced following interaction with bacteria.
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38
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Gianfranceschi GL, Amici D, Guglielmi L. An aqueous thymus extract modifies DNA-proteins interactions in the liver of old rats. Spectrophotometrical data. Experientia 1974; 30:1049-50. [PMID: 4411954 DOI: 10.1007/bf01939003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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39
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Gianfeanceschi GL, Amici D, Guglielmi L. [Possible reparative action of aqueous extracts of thymus on cultures of E. coli B damaged by ultraviolet light]. Boll Soc Ital Biol Sper 1974; 50:1102-7. [PMID: 4618782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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40
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Amici D, Gianfranceschi GL, Marsili G, Michetti L. Young and old rats. ATP, alkaline phosphatase, cholesterol and protein levels in the blood; DNA and RNA contents of the liver. Regulation by an aqueous thymus extract. Experientia 1974; 30:633-5. [PMID: 4837082 DOI: 10.1007/bf01921514] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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41
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Amici D, Gianfranceschi GL. Aqueous extracts of thymus regulating the RNA and protein synthesis in E. Coli B. Ital J Biochem 1974; 23:137-53. [PMID: 4608880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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42
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Gianfranceschi GL, Magaudda G, Amici D, Piantanelli L. Inhibition of the activity of the testicle exerted by an extract of spermatozoa. Endokrinologie 1974; 63:176-80. [PMID: 4852484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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43
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Amici D, Gianfranceschi GL, Marsili G, Michetti L. Young and old rats. ATP, alkaline phosphatase, cholesterol and protein levels in the blood; DNA and RNA contents of the liver, regulation by an aqueous thymus extract. Experientia 1974; 30:209-10. [PMID: 4814615 DOI: 10.1007/bf01927739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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44
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Gianfranceschi GL, Amici D, Guglielmi L. An aqueous thymus extract modifies DNA-protein interactions in the liver of old rats. Spectrophotometrical data. Experientia 1974; 30:213-4. [PMID: 4814619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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45
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Amici D, Gianfranceschi GL, Michetti L, Guglielmi L. [Influence of the concentration of pyrimidine nucleosides on the metabolic activity of E. coli B. II. Ribonucleotide reductase; CTP synthetase]. Boll Soc Ital Biol Sper 1973; 49:1097-103. [PMID: 4605750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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46
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Gianfranceschi GL, Amici D, Michetti L, Guglielmi L. [Influence of the concentration of pyrimidine nucleosides on the metabolic activity of E. coli B. I. Behavior of uridine-H3 uptake in relation to the presence of inert nucleosides]. Boll Soc Ital Biol Sper 1973; 49:1090-6. [PMID: 4605749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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47
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Amici D, Gianfranceschi GL, Guglielmi L, Michetti L. [Fractionation on Sephadex of an aqueous extract of thymus gland manifesting a regulatory action on RNA synthesis by E. coli B]. Boll Soc Ital Biol Sper 1973; 49:1085-9. [PMID: 4605679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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48
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Tedeschi GG, Amici D, Murri O. Multiplication of mycoplasma-like organisms brought in a culture medium by inactivated bovine serum. Ann Sclavo 1972; 14:766-71. [PMID: 4591524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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49
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Tedeschi GG, Amici D. Mycoplasma-like microorganisms probably related to L forms of bacteria in the blood of healthy persons. Cultural, morphological and histochemical data. Ann Sclavo 1972; 14:430-42. [PMID: 4130434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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50
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Tedeschi GG, Amici D, Paparelli M. Incorporation of nucleosides and amino-acids in human erythrocyte suspensions: possible relation with a diffuse infection of mycoplasms or bacteria in the L form. Nature 1969; 222:1285-6. [PMID: 5789671 DOI: 10.1038/2221285a0] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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