1701
|
Lad PJ, Blazquez E, Lin M, Leffert HL. Changes in adenylate cyclase and phosphodiesterase activities during the growth cycle of adult rat hepatocytes in primary culture. Arch Biochem Biophys 1984; 232:679-84. [PMID: 6087736 DOI: 10.1016/0003-9861(84)90588-5] [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: 01/18/2023]
Abstract
Long-term primary adult rat hepatocyte cultures show growth-state-dependent changes in adenylate cyclase and cAMP phosphodiesterase activities. Cellular adenylate cyclase activity decreases to undetectable levels within 1 day postplating, reappears on Days 4-5, and becomes maximal on Day 9. Membrane adenylate cyclase and cellular cAMP formation are insensitive to glucagon during log phase (Days 4-8) but not during lag (Day 1) or stationary phase (Day 12). Cyclic AMP phosphodiesterase activities (soluble and particulate) fall approximately equal to 70% by Day 2 but recover as proliferation begins. By contrast, the particulate phosphodiesterase assayed at 100 microM cAMP, decreased during Days 0-2. These observations simulate changes seen during liver proliferative transitions in vivo and, therefore, further support the use of these cultures as a developmental model.
Collapse
|
1702
|
Horuk R, Beckner S, Lin M, Wright DE, Chrambach A. Purification of the photoaffinity-labeled glucagon receptor by gel electrophoretic methods. PREPARATIVE BIOCHEMISTRY 1984; 14:99-121. [PMID: 6091090 DOI: 10.1080/10826068408070618] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Rat liver plasma membrane glucagon receptor has been purified with a yield of 0.01% to an estimated homogeneity of 32-60%, using a 2-stage electrophoretic procedure. SDS-solubilized membrane proteins labeled by the photoaffinity-agent, Ne-4-azidophenylamidinoglucagon (APA-glucagon), were separated by polyacrylamide gel electrophoresis in SDS-containing buffers. Gel slices corresponding to the molecular weight of the receptor were excised, electrophoretically extracted and concentrated. The concentrate was subjected to isoelectric focusing on Sephadex to yield a purified product in which the photoaffinity-labeled receptor, with a molecular weight of 56K and a pI' of 5.9, is the sole major component.
Collapse
|
1703
|
Sanfeld A, Lin M, Bios A, Panaiotov I, Baret J. Mechanical and electrochemical effects on surface convection and on emulsification new criteria. Adv Colloid Interface Sci 1984. [DOI: 10.1016/0001-8686(84)89001-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
1704
|
Brown JW, Lad PJ, Skelly H, Koch KS, Lin M, Leffert H. Expression of differentiated function by hepatocytes in primary culture: variable effects of glucagon and insulin on gluconeogenesis during cell growth. Differentiation 1984; 25:176-84. [PMID: 6363185 DOI: 10.1111/j.1432-0436.1984.tb01353.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Hormonal effects on gluconeogenesis from lactate were studied during the growth cycle of adult rat parenchyma liver cells using a primary monolayer culture system previously described [25]. Basal and glucagon-stimulated gluconeogenic ability were found to decline rapidly during log phase, insulin-stimulated growth. A progressive recovery of gluconeogenesis activity was observed after cell division subsided. Rates of lactate-gluconeogenesis were found also to decline in the absence of prior insulin exposure. This decline was not as rapid as the loss observed in cells cultured with insulin. However, in insulin-deficient cultures gluconeogenesis was completely abolished after 12 days and did not reelevate with further incubation unless cells were washed and exposed to glucagon. Decreasing growth rates of insulin-supplemented cultures by decreasing serum concentrations resulted in comparatively higher gluconeogenic activity. The results presented here are consistent with previous observations of hepatic parenchymal expression of 'differentiated function' during cellular growth phases in culture (i.e., differentiated functions are generally lost during rapid growth and regained as cells become quiescent). The present study, however, presents unexpected effects of insulin on the apparent growth-state dependent gluconeogenic recovery. Our data imply that although insulin has long been known to inhibit gluconeogenesis, its presence in culture may facilitate long-term basal maintenance of gluconeogenic enzyme activity. Insulin also functions as a growth factor whose initial mitogenic effect correlates with decreased gluconeogenic function. These changes show no simple or predictive correlation with cyclic nucleotide metabolism.
Collapse
|
1705
|
Yu DQ, Lin M. [Chemical studies on the weak alkaloids of Rauwolfia verticillata (Lour) Baill. F. rubrocarpa H. D. Zhang mss]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1982; 17:309-311. [PMID: 7136720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
|
1706
|
Fang QC, Lin M, Weng QM, Zhu CD, Liu X. [Alkaloids of Corydalis--studies on alkaloids of four species of Corydalis from Qinghai plateau (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1981; 16:798-800. [PMID: 7336944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|
1707
|
Lin M, Seltzer S. The consequences of a deuterium exchange test on proposed mechanisms for the purple membrane proton pump. FEBS Lett 1979; 106:135-8. [PMID: 40821 DOI: 10.1016/0014-5793(79)80711-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
1708
|
Rosen TS, Lin M, Spector S, Rosen MR. Maternal, fetal and neonatal effects of chronic propranolol administration in the rat. J Pharmacol Exp Ther 1979; 208:118-22. [PMID: 759604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
|
1709
|
Wen-Shung A, Lin M, Castell DO. Evidence of the importance of pH and salt concentration on column chromatography with Sepharose gel filtration in separation of proteins. Anal Biochem 1978; 86:345-56. [PMID: 26283 DOI: 10.1016/0003-2697(78)90757-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
1710
|
Chen WY, Chuang CY, Chen DS, Wang TH, Yen TS, Hsieh BS, Lin M. HBsAg, HBsAb, immunoglobulins and C3 in primary nephrotic syndrome. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1978; 77:378-85. [PMID: 276570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
1711
|
Antelman SM, Edwards DJ, Lin M. Phenylethylamine: evidence for a direct, postsynaptic dopamine-receptor stimulating action. Brain Res 1977; 127:317-22. [PMID: 861765 DOI: 10.1016/0006-8993(77)90548-0] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
1712
|
Haksar A, Lin M, Péron FG. Sources of reducing equivalents for the microsomal steroid 21-hydroxylation in isolated rat adrenal cells. Arch Biochem Biophys 1976; 173:121-4. [PMID: 1259433 DOI: 10.1016/0003-9861(76)90241-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
1713
|
Péron FG, Haksar A, Lin M. Sources of reducing equivalents for cytochrome P-450 mitochondrial steroid hydroxylations in rat adrenal cortex cells. JOURNAL OF STEROID BIOCHEMISTRY 1975; 6:411-7. [PMID: 1102797 DOI: 10.1016/0022-4731(75)90165-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
1714
|
Péron FG, Haksar A, Lin M, Kupfer D, Robidoux W, Kimmel G, Bedigian E. Studies on respiration and 11 beta-hydroxylation of deoxycorticosterone in mitochondria and intact cells isolated from the Snell adrenocortical carcinoma 494. Cancer Res 1974; 34:2711-9. [PMID: 4153485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
1715
|
Lin M, Haksar A, Peron FG. A possible mechanism for the stimulation of Krebs cycle activity by ACTH in isolated rat adrenal cells. Biochem Biophys Res Commun 1974; 58:983-9. [PMID: 4365893 DOI: 10.1016/s0006-291x(74)80240-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
1716
|
Fang CC, Lin M, Sun CM, Liu HM, Lang HY. [Studies on flavones of Radix puerariae]. ZHONGHUA YI XUE ZA ZHI 1974; 5:271-4. [PMID: 4211657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
1717
|
Awad SA, Bruce AW, Carro-Ciampi G, Downie JW, Lin M, Marks GS. Distribution of alpha- and beta-adrenoceptors in human urinary bladder. Br J Pharmacol 1974; 50:525-9. [PMID: 4447856 PMCID: PMC1776723 DOI: 10.1111/j.1476-5381.1974.tb08585.x] [Citation(s) in RCA: 110] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
1 The distribution of alpha- and beta-adrenoceptors in isolated preparations of human bladder neck and detrusor muscle has been studied.2 Adrenaline caused contraction of the bladder neck which was blocked by phenoxybenzamine but unaltered by propranolol.3 Isoprenaline caused relaxation of the bladder neck which was blocked by propranolol. High concentrations caused contraction which was enhanced by propranolol but blocked by phenoxybenzamine.4 Detrusor muscle was relaxed by isoprenaline and this effect was blocked by propranolol. Phenylephrine caused relaxation of detrusor which was unaffected by phenoxybenzamine; in some cases contraction was produced in the presence of propranolol.5 It is concluded that the bladder neck contains mainly alpha-receptors and the detrusor mainly beta-receptors but both regions posses both types of adrenoceptor.
Collapse
|
1718
|
Rosowsky A, Chaykovsky M, Lin M, Modest EJ. Pteridines. 2. New 6,7-disubstituted pteridines as potential antimalarial and antitumor agents. J Med Chem 1973; 16:869-75. [PMID: 4200929 DOI: 10.1021/jm00266a001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
1719
|
Yoshida A, Lin M. Regulation of glucose-6-phosphate dehydrogenase activity in red blood cells from hemolytic and nonhemolytic variant subjects. Blood 1973; 41:877-91. [PMID: 4145828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
|
1720
|
Rosowsky A, Chen KK, Lin M. 2,4-Diaminothieno(2,3-d)pyrimidines as antifolates and antimalarials. 3. Synthesis of 5,6-disubstituted derivatives and related tetracyclic analogs. J Med Chem 1973; 16:191-4. [PMID: 4632695 DOI: 10.1021/jm00261a004] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
1721
|
|
1722
|
Rosowsky A, Chaykovsky M, Chen KK, Lin M, Modest EJ. 2,4-Diaminothieno(2,3-d)pyrimidines as antifolates and antimalarials. 1. Synthesis of 2,4-diamino-5,6,7,8-tetrahydrothianaphthena(2,3-d)pyrimidines and related compounds. J Med Chem 1973; 16:185-8. [PMID: 4632693 DOI: 10.1021/jm00261a002] [Citation(s) in RCA: 47] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
1723
|
Chaykovsky M, Lin M, Rosowsky A, Modest EJ. 2,4-Diaminothieno(2,3-d)pyrimidines as antifolates and antimalarials. 2. Synthesis of 2,4-diaminopyrido(4',3':4,5)thieno(2,3-d)pyrimidines and 2,4-diamino-8H-thiopyrano(4',3':4,5)thieno(2,3-d)pyrimidines. J Med Chem 1973; 16:188-91. [PMID: 4632694 DOI: 10.1021/jm00261a003] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
1724
|
Yoshida A, Lin M. NH 2 -terminal formylmethionine- and NH 2 -terminal methionine-cleaving enzymes in rabbits. J Biol Chem 1972; 247:952-7. [PMID: 4110013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
|
1725
|
|