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101.
Yuzuru Hamada Toshifumi Udono Migaku Teramoto Ikuo Hayasaka 《Primates; journal of primatology》1998,39(2):157-169
Skeletal developmental of chimpanzees was studied cross-sectionally. By application of the TW2 method, we described the skeletal
development of chimpanzees and compared their skeletal development with humans'. A development pattern of chimpanzees repeated
accelerations and decelerations displaying “early-juvenile trough,” “pre-adolescent peak,” “mid-adolescent trough,” and “post-adolescent
peak” in incremental curves. Sex differences in skeletal development are slower development in males during infant and early
juvenile phases, and greater increment around the adolescent phase in males. Females are fully mature at younger ages than
males, e.g. about one and a half years. In comparison with chimpanzees, humans have such characteristics as a longer slower
period of juvenile development and a shorter spurt-like adolescent fast period which ends with full maturity. 相似文献
102.
Yuzuru Hamada Bambang Suryobroto Shunji Goto Suchinda Malaivijitnond 《International journal of primatology》2008,29(5):1271-1294
Long-tailed macaques (Macaca fascicularis fascicularis) are widely distributed in Southeast Asia and are morphologically and genetically (Tosi et al. in International Journal of Primatology 23:161–178, 2002) distinguishable on either side of the Isthmus of Kra (ca. 10.5°N). We compared the somatometry and body color of 15 local populations of long-tailed macaques in Thailand distributed
over areas from 6.5°N to 16.3°N and also a Thai rhesus macaque population at 17.2°N. Limb proportions and body color variation
follow the geographical trend. However, contrary to a previous report, body size does not decrease with latitude in the northern
group and also in the southern (southerly distributed) rhesus macaque. Relative tail length (RTL) and color contrast in yellow
between the back and thigh are the sole traits that distinctively separate the 2 groups: the southern group has a long relative
tail length (RTL >125%) and small color contrast, whereas the northern group has a short RTL (<120%) and large color contrast.
The southern rhesus macaques appear to have somatometric and body color traits that follow the geographical trend in long-tailed
macaques, though they maintain their distinctive species-specific traits of shorter RTL (ca. 55%), shorter relative facial length, and a bipartite body color pattern. Researchers assume that the northern group of long-tailed
macaques and the southern rhesus macaques had undergone partial introgression with each other. Montane refugia present during
the glacial period are localities in which introgression occurred in long-tailed macaques. 相似文献
103.
Bannister ML Hamada T Murayama T Harvey PJ Casarotto MG Dulhunty AF Ikemoto N 《The Biochemical journal》2007,401(1):333-339
To explain the mechanism of pathogenesis of channel disorder in MH (malignant hyperthermia), we have proposed a model in which tight interactions between the N-terminal and central domains of RyR1 (ryanodine receptor 1) stabilize the closed state of the channel, but mutation in these domains weakens the interdomain interaction and destabilizes the channel. DP4 (domain peptide 4), a peptide corresponding to residues Leu2442-Pro2477 of the central domain, also weakens the domain interaction and produces MH-like channel destabilization, whereas an MH mutation (R2458C) in DP4 abolishes these effects. Thus DP4 and its mutants serve as excellent tools for structure-function studies. Other MH mutations have been reported in the literature involving three other amino acid residues in the DP4 region (Arg2452, Ile2453 and Arg2454). In the present paper we investigated the activity of several mutants of DP4 at these three residues. The ability to activate ryanodine binding or to effect Ca2+ release was severely diminished for each of the MH mutants. Other substitutions were less effective. Structural studies, using NMR analysis, revealed that the peptide has two a-helical regions. It is apparent that the MH mutations are clustered at the C-terminal end of the first helix. The data in the present paper indicates that mutation of residues in this region disrupts the interdomain interactions that stabilize the closed state of the channel. 相似文献
104.
105.
Kondo-Okamoto N Noda NN Suzuki SW Nakatogawa H Takahashi I Matsunami M Hashimoto A Inagaki F Ohsumi Y Okamoto K 《The Journal of biological chemistry》2012,287(13):10631-10638
Autophagy-related degradation selective for mitochondria (mitophagy) is an evolutionarily conserved process that is thought to be critical for mitochondrial quality and quantity control. In budding yeast, autophagy-related protein 32 (Atg32) is inserted into the outer membrane of mitochondria with its N- and C-terminal domains exposed to the cytosol and mitochondrial intermembrane space, respectively, and plays an essential role in mitophagy. Atg32 interacts with Atg8, a ubiquitin-like protein localized to the autophagosome, and Atg11, a scaffold protein required for selective autophagy-related pathways, although the significance of these interactions remains elusive. In addition, whether Atg32 is the sole protein necessary and sufficient for initiation of autophagosome formation has not been addressed. Here we show that the Atg32 IMS domain is dispensable for mitophagy. Notably, when anchored to peroxisomes, the Atg32 cytosol domain promoted autophagy-dependent peroxisome degradation, suggesting that Atg32 contains a module compatible for other organelle autophagy. X-ray crystallography reveals that the Atg32 Atg8 family-interacting motif peptide binds Atg8 in a conserved manner. Mutations in this binding interface impair association of Atg32 with the free form of Atg8 and mitophagy. Moreover, Atg32 variants, which do not stably interact with Atg11, are strongly defective in mitochondrial degradation. Finally, we demonstrate that Atg32 forms a complex with Atg8 and Atg11 prior to and independent of isolation membrane generation and subsequent autophagosome formation. Taken together, our data implicate Atg32 as a bipartite platform recruiting Atg8 and Atg11 to the mitochondrial surface and forming an initiator complex crucial for mitophagy. 相似文献
106.
The pineal hormone melatonin (N-acetyl-5-methoxytryptamine) exerts antigonadotropic effects in some mammalian species. To evaluate the effect of luteinizing hormone (LH) on melatonin release and its synthesizing enzyme activities in pineal glands, pineals of adult female rats undergoing diestrus were organ-cultured in a medium containing 10(-12), 10(-10) or 10(-8) M LH for 6 h. Melatonin release increased significantly in pineals cultured with 10(-12) and 10(-10) M LH, as compared to control values. Similarly, the activity of arylalkylamine N-acetyltransferase (NAT), the key regulatory enzyme in melatonin biosynthesis, was significantly higher in pineals cultured with 10(-12) and 10(-10) M LH for 6 h, while LH at 10(-8) M had no effect. Although LH at 10(-10) M increased pineal hydroxyindole-O-methyltransferase (HIOMT) activity, which catalyzes the final step of melatonin biosynthesis, LH at 10(-12) and 10(-8) M had no effect. These results demonstrate that at relatively low physiological levels, LH stimulates pineal melatonin synthesis and release, mainly by increasing NAT activity. 相似文献
107.
Fukunaga M Miyata S Liu BF Miyazaki H Hirota Y Higo S Hamada Y Ueyama S Kasuga M 《Biochemical and biophysical research communications》2004,320(3):689-695
The formation of glucose-derived methylglyoxal (MG), a highly reactive dicarbonyl compound, is accelerated under diabetic conditions. We examined whether MG was capable of inducing apoptosis in Schwann cells (SCs), since recent studies have suggested a potential involvement of apoptotic cell death in the development of diabetic neuropathy. MG induced apoptosis in SCs in a dose-dependent manner, accompanied by a reduction of intracellular glutathione content and activation of the p38 MAPK. Inhibiting the p38 MAPK activation by SB203580 successfully suppressed the MG-induced apoptosis in SCs. Aminoguanidine and N-acetyl-l-cysteine also inhibited the MG-induced p38 MAPK activation and apoptosis along with restoration of the intracellular glutathione content. These results suggest a potential role for MG in SC injury through oxidative stress-mediated p38 MAPK activation under diabetic conditions, and it may serve as a novel insight into therapeutic strategies for diabetic neuropathy. 相似文献
108.
Abstract. We investigated the seasonal prevalence of reproductive activities and of the development of brooded propagules in an intertidal sea anemone, Anthopleura sp., on the rocky shore of Mutsu Bay, in northern Japan. A monthly examination of anemones, by dissection and histological techniques, revealed no sign of gonad development, but did reveal that they produce and internally brood propagules throughout the year. Release of propagules was observed in the field. This anemone population appears to be entirely asexual and agametic, and may persist solely through clonal propagation. 相似文献
109.
Kashiwagi T Hara K Kohara M Iwahashi J Hamada N Honda-Yoshino H Toyoda T 《The Journal of biological chemistry》2002,277(32):28700-28705
110.
Miura T Fukami TA Hasegawa K Ono N Suda A Shindo H Yoon DO Kim SJ Na YJ Aoki Y Shimma N Tsukuda T Shiratori Y 《Bioorganic & medicinal chemistry letters》2011,21(19):5778-5783
Heat shock protein 90 (Hsp90) is a molecular chaperone which regulates maturation and stabilization of its substrate proteins, known as client proteins. Many client proteins of Hsp90 are involved in tumor progression and survival and therefore Hsp90 can be a good target for developing anticancer drugs. With the aim of efficiently identifying a new class of orally available inhibitors of the ATP binding site of this protein, we conducted fragment screening and virtual screening in parallel against Hsp90. This approach quickly identified 2-aminotriazine and 2-aminopyrimidine derivatives as specific ligands to Hsp90 with high ligand efficiency. In silico evaluation of the 3D X-ray Hsp90 complex structures of the identified hits allowed us to promptly design CH5015765, which showed high affinity for Hsp90 and antitumor activity in human cancer xenograft mouse models. 相似文献