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Gerontology. 2002 Nov-Dec;48(6):401-7.
Ageing and longevity are related to growth hormone/insulin-like growth factor-1 secretion.

Ruiz-Torres A, Soares de Melo Kirzner M.

University Research Institute of Gerontology and Metabolism, University Autonoma of Madrid, Madrid, Spain. arutrrakis.es

BACKGROUND: It is known that the growth process is related to an individual's life-span, but the role of growth hormone (GH) secretion in human ageing remains unknown. OBJECTIVE: This study has focussed on the influence of GH on ageing parameters and on its relationship with human longevity. METHODS: To deal with the first issue, we compared ageing parameters of young (up to 39) and old (over 70) individuals having similar insulin-like growth factor-1 (IGF-1) blood levels. For the second one, the decline in IGF-1 levels was studied comparing its behaviour in the first half with that in the second half of adult life. The latter represents the period of life in which mortality progressively increases. Two hundred and five healthy individuals were chosen as subjects, well distributed by gender and age (between 19 and 93 years). RESULTS: Old males with IGF-1 levels similar to young ones do not show the age-dependent decrease in serum testosterone and lean body mass, nor the increase in fat body mass. Other hormone-metabolic and nutritional parameters do not reveal any change compared with the results of all individuals. In females, the results do not allow to assume any IGF-1 influence. The behaviour of the linear regression in the second half of adult life of males, which becomes flat because old men having low IGF-1 blood levels die earlier, is consistent with these results. This effect, which is supported by predictive analysis, is not observed in females, i.e. the IGF-1 level declines in the second half of the women's adult life are only a little flatter than in the first half. Finally, extrapolating the regressions obtained in the first half of adulthood, the age at which the curve crosses the x-axis is 110 years for males and 132 for females. CONCLUSIONS: The presented study of IGF-1 levels suggests that the GH secretion in adulthood plays a determinant role not only for some regressive manifestations, but also for life potential. 2002 S. Karger AG, Basel

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12393957&dopt=Abstract

Clin Nucl Med. 2002 Nov;27(11):772-80.
Thyroid carcinoma: iodine-131-negative whole-body scan reverses to positive after a combination of thyrogen stimulation and withdrawal.

Kasner DL, Spieth ME, Starkman ME, Zdor-North D.

Marshfield Medical Research and Education Foundation, Department of Radiology, Nuclear Medicine Section, Marshfield, Wisconsin, USA.

PURPOSE: Reports state that scan results for as many as 25% of patients with differentiated thyroid carcinoma will convert to iodine-131 (I-131) negative over time with positive thyroglobulin levels. Tl-201, positron emission tomography (PET), and sestamibi or tetrofosmin have all helped to identify I-131-negative thyroid carcinomas. The authors have identified a case of reversal of I-131 findings from negative to positive after short-term thyroxine withdrawal combined with treatment with recombinant human thyroid-stimulating hormone (rhTSH). MATERIALS AND METHODS: The authors obtained multiple I-131 whole-body scans with 4-week thyroid hormone withdrawal, post-I-131 therapy scans, nonthyroid withdrawal Tl-201 chloride whole-body tumor images, and finally combined 2.5-week thyroid hormone withdrawal and rhTSH-stimulation I-131 whole-body scans before and after therapy. RESULTS: The authors examined one patient during a period of 9 years whose I-131 whole-body scan results were at first positive and then became negative. After a combination of rhTSH stimulation and thyroid hormone withdrawal, the results changed again to I-131 positive. CONCLUSIONS: This is the first known case in which I-131 findings changed from negative to positive. A combination of rhTSH stimulation and nearly adequate withdrawal may help convert more I-131-negative whole-body scans to positive.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12394123&dopt=Abstract

Anticancer Drugs. 2002 Oct;13(9):949-56.
Effective treatment of experimental ES-2 human ovarian cancers with a cytotoxic analog of luteinizing hormone-releasing hormone AN-207.

Arencibia JM, Bajo AM, Schally AV, Krupa M, Chatzistamou I, Nagy A.

Department of Medicine, Tulane University School of Medicine, New Orleans, LA 70112-1262, USA.

The receptors for luteinizing hormone-releasing hormone (LHRH) are found in 80% of human ovarian carcinomas. These receptors can be used for targeted chemotherapy with cytotoxic analogs of LHRH, such as AN-207, consisting of 2-pyrrolinodoxorubicin (AN-201) linked to [D-Lys ]LHRH. We investigated the effects of AN-207 and AN-201 on the growth of LHRH receptor-positive ES-2 human ovarian cancers. The effects of the treatment on mRNA and protein levels of human epidermal growth factor (EGF) receptors (EGFR and HER-2) in ovarian tumors were determined by RT-PCR and immunoblotting. In Experiment 1, nude mice bearing ES-2 ovarian tumors were injected i.v. with 250 nmol/kg doses of AN-207, AN-201, the carrier [D-Lys ]LHRH, an unconjugated mixture of AN-201 and [D-Lys ]LHRH or vehicle. AN-207 caused a significant ( <0.01) 59.5% inhibition in tumor growth while its components were ineffective. In Experiment 2, mice with large ES-2 tumors were treated with AN-207 or AN-201 at 250 nmol/kg. Again, AN-207, but not AN-201, inhibited tumor growth. In Experiment 3, the site of action of AN-207 was investigated. The blockade of LHRH receptors with Cetrorelix partially suppressed the antitumor effect of AN-207. Treatment with AN-207 significantly ( <0.01) decreased the expression of mRNA for EGFR, and HER-2 by 27 and 34%, respectively, as compared to controls and reduced the receptor protein levels of EGFR and HER-2 by 35 and 36%, respectively ( <0.05). The results indicate that cytotoxic LHRH analog AN-207 could be considered for chemotherapy of ovarian cancers expressing LHRH receptors.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12394258&dopt=Abstract

J Sleep Res. 1999 Mar;8(1):57-64.
The relationship between 6-sulphatoxymelatonin and polysomnographic sleep in good sleeping controls and wake maintenance insomniacs, aged 55-80 years.

Lushington K, Dawson D, Kennaway DJ, Lack L.

School of Psychology, University of South Australia, Australia.

The pineal hormone, melatonin, is reported to possess hypnotic properties. This has led to an investigation of the relationship between the endogenous melatonin rhythm and sleep. However, this relationship has yet to be fully examined in aged insomniacs and controls. From media advertisements, 16 good sleeping controls (11F, 5M) and 16 sleep maintenance insomniacs (11F, 5M), aged over 55 years, were recruited to participate in a study involving four nights of polysomnographically (PSG) measured sleep followed by a 26 h constant routine. During the constant routine, 2 h urine samples were collected and analysed for the melatonin metabolite, 6-sulphatoxymelatonin (aMT.6S). This was used to determine total melatonin excretion. As well, the following circadian melatonin parameters were calculated from fifth order polynomial curve fitting analyses, the goodness of the polynomial curve fit, peak melatonin concentration, the phase of the melatonin rhythm, and melatonin and sleep rhythm synchrony. Apart for one control, all subjects showed significant circadian melatonin rhythms. Although insomniacs showed a greater amount of wakefulness, less sleep in total, and lower sleep efficiency, no significant group differences were observed in any of the melatonin parameters. In addition, while subjects with more reliable melatonin curve fits showed shorter sleep latencies and higher sleep efficiencies, correlational analyses revealed no other significant relationships between any melatonin and PSG sleep parameters. Overall, the present results suggest that neither melatonin amplitude nor phase are related to sleep quality in the aged.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10188137&dopt=Abstract

Alcohol Clin Exp Res. 2002 Oct;26(10):1539-44.
Carbohydrate-deficient transferrin levels reflect heavy drinking in alcohol-dependent women seeking treatment.

Rukstalis MR, Lynch KG, Oslin DW, Pettinati HM, Anderson SM, Volpicelli JR, Anton RF.

Center for the Study of Addictions, Department of Psychiatry, University of Pennsylvania, and Philadelphia Medical Center for Veteran Affairs, Philadelphia Pennsylvania 19104, USA. rukstalis_ail.trc.upenn.edu

BACKGROUND: Carbohydrate-deficient transferrin (CDT) is a biochemical marker that has been shown to be sensitive in detecting heavy drinking in men, but studies examining CDT in women have been inconsistent because of small sample sizes and failure to consider hormonal status. In healthy female subjects, CDT levels are significantly higher in premenopausal women with higher estradiol (E2) levels (>30 pg/ml) and those taking exogenous estrogens (oral contraceptives, hormone replacement therapy) compared with men and postmenopausal women. This study examined the relationship between drinking behavior and CDT levels in a large sample of alcohol-dependent women and contrasted findings in a comparison group of alcohol-dependent men. The study also examined the extent that E2 levels mediated the relationship between CDT levels and heavy drinking in the alcohol-dependent women. METHODS: This study examined the association between CDT level at treatment entry and alcohol consumption the month before initiating treatment in 96 women with a DSM-III-R diagnosis of alcohol dependence, as compared with similar data in 123 male alcoholics. To explore the relationship between E2 and CDT, E2 was measured in women at the time of CDT sampling. Linear regression was used to examine whether patterns of alcohol consumption in the 28 days before the CDT blood sampling predicted the CDT level in women and men presenting for treatment for alcohol dependence. RESULTS: CDT levels were higher in women than men and were related to quantitative alcohol consumption (total standard drinks, percentage of days drinking, percentage of days of heavy drinking) in the month before initiating treatment, irrespective of E2 levels in women. CONCLUSIONS: These results suggest that in a larger sample of female alcoholics, the amount of alcohol consumed predicted CDT, similar to what has been reported in male alcoholics. The E2 status did not seem to mediate these results.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12394287&dopt=Abstract

Hair loss is a problem in modern soceity. Examining the factors of hair growth may shed light on how hair loss might occur. How long can hair grow before it stops growing eventually if it does? Given that the hair growth rate is quite uniform and constant, somewhere between 0.3-0.5 millimeters per day, it's believed that the length of anagen, the growth phase, differs among individuals, and this is the major determinant to the maximum hair length. For some individuals, anagen may last ten years. Of course the length of the anagen is governed by genes, and the genetic background of the individuals. Non-genetic factors such as nutritional condition, weather, seasonal changes (hair may grow a bit faster during winter), taking medications, health condition may of course influence the rate of hair growth as well as hair loss. The shape of the hair, straight or curly, is dependent on the shape of the follicle. A circular or round hair follicle would generate straight hair, while the follicle with oval or elliptical shapes (in its cross-section) would produce a curly hair.

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.

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