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Interferon research abs 1 || Hemoglobin research abs || Stem cell research abs || Nucleic acid research abs || Herpes research abs || Bronchitis research abs || Schizophrenia research abs || Tuberculosis research abs || Pneumonia research abs || Constipation research abs || Laxative research abs || hair research abs || hair related research references || testosterone related research references || melanin related research references || caffeine related research references || nicotine related research references





Cancer Res. 2003 Jul 15;63(14):4074-81.
G2 arrest in response to topoisomerase II inhibitors: the role of p53.

Clifford B, Beljin M, Stark GR, Taylor WR.

Department of Molecular Biology, Lerner Research Institute, The Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA.

We have previously found that the overexpression of p53 causes G(2) arrest and represses the synthesis of cyclin-dependent kinase 1 and cyclin B1, two proteins required for cells to traverse from G(2) into M. G(2) arrest occurs in response to DNA damage caused by a variety of agents and treatments. Here, we investigate the role of p53 in the G(2) arrest that occurs in response to the topoisomerase inhibitors etoposide and merbarone. In HT1080 cells expressing a dominant-negative form of p53, treatment with etoposide still caused G(2) arrest, but the arrest could be overcome by additional treatment with caffeine, which inhibits the damage-responsive kinases ataxia telangiectasia mutated (ATM) and atm and rad3-related (ATR). However, caffeine could not overcome etoposide-induced G(2) arrest in HT1080 cells with functional p53. We conclude that etoposide activates two pathways, one of which depends on p53 and the other of which is sensitive to caffeine, and that either pathway is sufficient to activate G(2) arrest. Etoposide inhibits topoisomerase II by trapping the enzyme in a complex with cleaved DNA. Inhibition of topoisomerase II with merbarone, which does not stabilize a cleavage complex, causes G(2) arrest by a checkpoint that monitors the decatenation of chromatin. We find that caffeine can abrogate merbarone-induced G(2) arrest even in cells with functional p53, indicating that p53 does not contribute to the decatenation-sensitive response. Thus, p53 has a differential role in effecting G(2) arrest in response to topoisomerase II inhibitors, depending upon the mechanisms of action of the inhibitors tested.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12874009&dopt=Abstract



Hum Mol Genet. 2003 Aug 1;12(15):1875-80.
Pkd2 haploinsufficiency alters intracellular calcium regulation in vascular smooth muscle cells.

Qian Q, Hunter LW, Li M, Marin-Padilla M, Prakash YS, Somlo S, Harris PC, Torres VE, Sieck GC.

Department of Medicine, Division of Nephrology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA. qian.qayo.edu

Autosomal-dominant polycystic kidney disease is a multiorgan disease and its vascular manifestations are common and life-threatening. Despite this, little is known about their pathogenesis. Somatic mutations to the normal PKD allele in cystic epithelia and cyst development associated with the unstable Pkd2(WS25) allele suggest a two-hit model of cystogenesis. However, it is unclear if this model can account for the cardiovascular pathology or if haploinsufficiency alone is disease-associated. In the present study, we found a decreased polycystin-2 (PC2, protein encoded by Pkd2 gene) expression in Pkd2( +/-) vessels, roughly half the wild-type level, and an enhanced level of intracranial vascular abnormalities in Pkd2 (+/-) mice when induced to develop hypertension. Consistent with these observations, freshly dissociated Pkd2 (+/-) vascular smooth muscle cells have significantly altered intracellular Ca(2+) homeostasis. The resting [Ca(2+)](i) is 17.1% lower in Pkd2 (+/-) compared with wild-type cells (P=0.0003) and the total sarcoplasmic reticulum Ca(2+) store (emptied by caffeine plus thapsigargin) is decreased (P<0.0001). The store operated Ca(2+) (SOC) channel activity is also decreased in Pkd2 (+/-) cells (P=0.008). These results indicate that inactivation of just one Pkd2 allele is sufficient to significantly alter intracellular Ca(2+) homeostasis, and that PC2 is necessary to maintain normal SOC activity and the SR Ca(2+) store in VSMCs. Based on these findings, and the fact that [Ca(2+)](i) signaling is essential to the regulation of contraction, production and secretion of extracellular matrix, cellular proliferation and apoptosis, we propose that the abnormal intracellular Ca(2+) regulation associated with Pkd2 haploinsufficiency is directly related to the vascular phenotype.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12874107&dopt=Abstract [PubMed - in process]



Ann Bot (Lond). 2003 Aug;92(2):259-64.
Effects of caffeine and chlorogenic acid on propidium iodide accessibility to DNA: consequences on genome size evaluation in coffee tree.

Noirot M, Barre P, Duperray C, Louarn J, Hamon S.

IRD BP5045, 34032 Montpellier Cedex, France. noiropl.ird.fr

Estimates of genome size using flow cytometry can be biased by the presence of cytosolic compounds, leading to pseudo-intraspecific variation in genome size. Two important compounds present in coffee trees-caffeine and chlorogenic acid-modify accessibility of the dye propidium iodide to Petunia DNA, a species used as internal standard in our genome size evaluation. These compounds could be responsible for intraspecific variation in genome size since their contents vary between trees. They could also be implicated in environmental variations in genome size, such as those revealed when comparing the results of evaluations carried out on different dates on several genotypes.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12876189&dopt=Abstract [PubMed - in process]







Natural Herbal Supplement: Hair Million


Hair loss alone does not pose significant health problems. In fact, there are people who opt for baldness as an alternative hair style. However, in general, however, hair loss is not considered desirable.

The most ostensive feature that distinguishes us human from chimps and other primates is the lack of bodily hair. During evolutionary process, we have lost the majority of hair. Hair is no longer a biologically essential part of our body, just like appendix. The hair we still have on our scalp and a few other bodily parts is still regarded as significant for reasons other than biological necessity. Hair loss is naturally accompanied by aging process, although the extent of hair loss and the timing of onset vary widely among individuals. Thus, loss of hair and baldness is considered as a symbol of maturity or old age. Like winkles and other signs of aging, hair loss is not welcome by most people, because we don't welcome aging, and being perceived as an aging person. However, it is alopecia, or premature hair loss that especially concerns certain people.

While the hair loss and resulting baldness in general have not been proven to be related to underlying health problems, there are certain correlations between hair loss and health problems. For instance, premature hair loss could suggest premature aging or nutritional and hormonal imbalance, stressful life, use of drugs that cause hair loss as a side effect, skin disease, or heart disease. The balding appearance could also impart a subdued impression of integrity in bodily health and youthfulness.












DHEA is a natural hormone, and it is produced in our body by the adrenal glands. DHEA has been suggested to provide numerous potential benefits. DHEA (or dehydroepiandrosterone) is converted into androgens (male hormones) or estrogens (female hormones) in the cells. Our bodies produce decreasing amount of DHEA as we get older. various health benefits: To deter aging, improve sexual function/erectile dysfunction, treat cognitive decline, enhance athletic performance, facilitate weight loss, improve strength, prevent osteoporosis, enhance immunomodulation for rheumatic conditions, and treat depression.





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