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PubMed1993

Factors associated with use of safer sex practices among college freshmen.

The purpose of this exploratory study was to examine the relationship of knowledge of AIDS, misconceptions about AIDS, knowledge of safer sex practices, perceived susceptibility, and future time perspective to the practice of safer sex behaviors in 352 single, sexually active, college freshmen. Data were analyzed using stepwise multiple regression analysis and discriminant analysis. There were too few black females for analysis. Future time perspective explained the most variance in safer sex practices for black males. Knowledge of AIDS, perceived susceptibility, misconceptions about AIDS, knowledge of safer sex practices, and future time perspective did not explain a significant amount of variance in use of safer sex practices for either white males or females. However, perceived susceptibility and future time perspective differentiated sexually active from nonsexually active white males and females.

Acquired Immunodeficiency Syndrome↗

PubMed2006

The discovery of labile methyl esters on proliferating cell nuclear antigen by MS/MS.

The post-translational modification of proliferating cell nuclear antigen (PCNA) has been implicated in modulating its function for over 20 years. With multiple interacting partners, PCNA is involved in processes ranging from DNA replication and repair to cell cycle control and apoptosis. The ability of PCNA to distinguish between specific binding partners in different tasks is currently of intense interest, and several post-translational modifications have been reported to modulate its function. Unfortunately, these reports have produced contradictory information on the type(s) of modification present on the molecule. Here we report a detailed structural analysis of a single acidic PCNA isoform, cancer-specific polyferating nuclear anitgen (csPCNA), isolated from breast cancer cells by 2D-PAGE and LC-MS/MS. With this approach we fully characterized the csPCNA isoform and confidently identified a single post-translational modification, methyl esterification. Interestingly, the methyl esters consistently localized to 15 specific glutamic and aspartic acid residues of csPCNA. The methyl esterification of csPCNA represents a novel type of post-translational modification in mammalian cells that could ultimately hold the key towards unlocking its diverse functions.

Amino Acid Sequence↗

PubMed1994

The correlation between HIV seropositivity, cervical dysplasia, and HPV subtypes 6/11, 16/18, 31/33/35.

Twenty-one human immunodeficiency virus (HIV) seropositive patients were studied to determine the prevalence of cervical dysplasia, the distribution of human papilloma virus (HPV) subtypes, and the utility of cytologic diagnosis in this population. The patients ranged in age from 18 to 41 years. HIV infection was diagnosed in all patients by ELISA method and confirmed by Western blot. Patients were interviewed to document risk factors for HIV infection and cervical dysplasia. All were examined colposcopically and identifiable lesions were biopsied. In patients with normal colposcopic findings four quadrant biopsies were performed. Cervical and endocervical smears were obtained on all patients at the time of colposcopy and blood was collected for T-cell studies. Eighteen patients (86%) had abnormal cytologic findings. The Pap smear was able to identify 10 of 13 biopsy-proven epithelial abnormalities. In 14 patients there was sufficient tissue for HPV typing by in situ hybridization; the HPV subtypes identified were 6/11 (10 patients), 16/18 (9 patients), and 31/33/35 (9 patients). Dysplasia was present in 11/14 (79%) of the specimens submitted for subtyping. The absolute CD4 cell counts were 342 per mm3 for the dysplasia group and 281 per mm3 for the patients without dysplasia. Patients with dysplasia did not differ significantly from patients without dysplasia in regard to risk factors for cervical dysplasia, including history of STD, tobacco use, multiple sexual partners, age at first coitus, and parity. In addition, history of medication use and risk factors associated with HIV infection were similar in both groups.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗

PubMed1996

Risk factors for cervical intraepithelial neoplasia in Taiwan.

A population-based case-control study was conducted in Taiwan between July 1991 and June 1994 to evaluate the significance between risk factors for cervical intraepithelial neoplasia (CIN) among Taiwanese women. Personal interviews were compiled with 288 histologically confirmed CIN who were matched by age to 576 randomly selected controls with normal cervical smears. Using logistic regression models to simultaneously evaluate the effects of multiple factors as predictors of CIN, we found that the strongest risk was associate with HPV infection (OR = 5.02). Other significant risks included husband's visiting prostitutes (OR = 2.56), four or more vaginal deliveries (OR = 2.01), two or more induced abortions (OR = 1.96), and multiple sex partners (OR = 1.87). A protective effect was also noted with the use of condoms (OR = 0.38). These data support the hypothesis that CIN is sexually transmitted in Taiwan's population and may have a viral etiology. Furthermore the results indicate the important role of the husband's visiting prostitutes and the nonuse of condoms as contributing factors in the high incidence rate for CIN in a population.

Case-Control Studies↗

PubMed2002

Cervical intraepithelial neoplasia is associated with increased polyamine oxidase and diamine oxidase concentrations in cervical mucus.

OBJECTIVE: The aim of this study was to establish whether reactive oxygen species, generated during oxidation of amines, catalyzed by polyamine oxidase (PAO) and diamine oxidase (DAO) in cervical secretions may play a role in the etiology of cervical cancer. METHODS: Cervical mucus was obtained from women attending the gynecological outpatient department: 139 with and 154 without cytological evidence of cervical intraepithelial neoplasia were recruited. The mucus was freeze dried in liquid nitrogen, weighed, and later resuspended for assay of PAO and DAO concentrations using a chemiluminescence method. The two groups were compared by group sequential analysis using PEST3 software. RESULTS: Patients with a colposcopic diagnosis of a high-grade squamous intraepithelial lesion (SIL) had significantly higher enzyme activities than control cases (L(N)PAO 1.37 (0.37) versus 1.18 (0.35): Student t test: P < 0.001; L(N)DAO 1.37 (0.36) versus 1.15 (0.37): Student t test: P < 0.001). CONCLUSION: It is probable that this rise in enzyme activity precedes cytological changes and plays some part in the etiology of cervical cancer, as the cells that undergo premalignant change are normally squamous in origin, whereas mucus is a product of columnar epithelium. Higher enzyme activity in patients with SIL than in controls may be a reflection of higher risk of exposure to amine substrates in semen through multiple sexual partners.

Amine Oxidase (Copper-Containing)↗

PubMed2001

Depression, suicidal ideation and STD-related risk in homeless older adolescents.

Goals of this study were to examine the frequency of depression and related constructs of suicidal ideation and hopelessness in a sample of homeless older adolescents and their associations with behaviors that may increase the risk of sexually transmitted disease (STD). Diagnostic interviews and blood/urine samples were obtained from 523 homeless adolescents (mean age=17.8). Overall, 12.2 per cent had a current DSM-IV diagnosis of major depression and 6.5 per cent had dysthymia, with higher rates for female and older participants. Depression appeared to precede rather than follow homelessness and was associated with biologically verified STDs (in older participants), infrequent condom use, a non-heterosexual orientation (in older participants), and lifetime homosexual experience. Unlike depression, suicidal ideation and hopelessness were associated with higher rates of intravenous drug use but lower rates of multiple sex partners and, in young homeless women, less sexual coercion. Depression is frequent in homeless older adolescents and has a complex association with STD-related behaviors.

Adolescent↗

PubMed2001

Crystal structures of YBHB and YBCL from Escherichia coli, two bacterial homologues to a Raf kinase inhibitor protein.

In rat and human cells, RKIP (previously known as PEBP) was characterized as an inhibitor of the MEK phosphorylation by Raf-1. In Escherichia coli, the genes ybhb and ybcl possibly encode two RKIP homologues while in the genomes of other bacteria and archaebacteria other homologous genes of RKIP have been found. The parallel between the cellular signaling mechanisms in eukaryotes and prokaryotes suggests that these bacterial proteins could be involved in the regulation of protein phosphorylation by kinases as well. We first showed that the proteins YBHB and YBCL were present in the cytoplasm and periplasm of E. coli, respectively, after which we determined their crystallographic structures. These structures verify that YBHB and YBCL belong to the same structural family as mammalian RKIP/PEBP proteins. The general fold and the anion binding site of these proteins are extremely well conserved between mammals and bacteria and suggest functional similarities. However, the bacterial proteins also exhibit some specific structural features, like a substrate binding pocket formed by the dimerization interface and the absence of cis peptide bonds. This structural variety should correspond to the recognition of multiple cellular partners.

Amino Acid Sequence↗

PubMed1993

Prevalence and correlates of AIDS-risk behaviors among urban minority high school students.

BACKGROUND: To guide the development of an AIDS prevention program for urban minority high school students, the authors investigated the prevalence of AIDS-risk behaviors, and the relative explanatory power of demographic, contextual, and cognitive correlates of these behaviors, among black and Hispanic students in three New York City public high schools. METHODS: A survey was administered to a randomly selected sample of classrooms in the 9th through 12th grades of three public academic high schools in a New York City borough. Survey participants (n = 926) were 59% black and 34% Hispanic; the mean age was 16.4 (sd 1.4) years. RESULTS: Two-thirds of students reported having had sexual intercourse. Of the more than one-half of students who reported past-year intercourse, three-quarters had never or had inconsistently used condoms, one-third had multiple intercourse partners, one-tenth had a sexually transmitted disease, and one-twentieth had intercourse with a high-risk partner. Demographic (i.e., age, race/ethnicity) and contextual (i.e., academic failure, substance use, adverse life circumstances, cues to prevention) factors were most strongly associated with involvement in AIDS-risk behaviors; in contrast, cognitive factors (i.e., knowledge and beliefs about AIDS and AIDS-preventive actions) had little explanatory power. CONCLUSIONS: Addressing demographic and contextual risk factors for involvement in AIDS-related behaviors may prove to be a more powerful AIDS-prevention strategy among adolescents than simply teaching facts about AIDS and fostering prevention-related beliefs.

Acquired Immunodeficiency Syndrome↗

PubMedDate not supplied

Americans' knowledge of cancer risk and survival.

BACKGROUND: There are more than 500,000 deaths from cancer each year in the United States. This study examines Americans' knowledge of risk factors for breast, cervical, colon, and prostate cancers, which account for over 130,000 of these deaths, and their knowledge of the prospects of surviving these cancers following early detection. METHODS: Data were obtained from 12,035 subjects who completed the 1992 National Health Interview Survey Cancer Control Supplement which includes questions about cancer risk factors and survival. RESULTS: The majority of respondents were unable to identify major cancer risk factors when prompted with a list. Approximately two-thirds did not recognize that age increased the risk for breast and colon cancer, that diet increased the risk for colon cancer, or that multiple sex partners increased the risk for cervical cancer. Knowledge about survival was also poor. Only about half thought they had a good chance of survival following early detection of colon and cervical cancers, for which 5-year relative survival exceeds 90%. CONCLUSIONS: Americans lack knowledge about major risk factors for common cancers and about the prospects of survival following early detection. Knowledge about risk factors and about survival from cervical and colon cancers was poor at all ages, among all races, at all income levels, and at all educational levels. It was poorest among blacks and Hispanics and among those with the lowest income and least education. Americans need education about cancer risk factors and survival.

Adult↗

PubMed2002

Sexual behavior of drug-users: is it different?

BACKGROUND: Across the world, drug-users (DU) have been shown to be at greater risk of contracting and transmitting sexually transmitted diseases and HIV infection. However, in the metropolitan cities of India, where drug-use patterns may uniquely vary between injection and noninjection, depending on drug availability, little is known about the risk behavior of drug-users. OBJECTIVE: The objective of the study was to find out whether drug-users are more likely to practice high-risk sexual behavior compared to non-drug users. METHODS: The sexual behavior of 70 drug-users, selected by snowball sampling, was compared with 128 age- and economic status-matched controls (non-drug-users), randomly selected from the same community. RESULTS: Seventy-eight percent sexually active drug-users and 43% sexually active non-drug-users had multiple sex partners (P < 0.02). The average number of sex partners was significantly higher among the drug-users (P = 0.05). Anal intercourse was practiced by 25.7% drug-users and 8.6% non-drug-users (OR = 3.7; P < 0.01). The drug-users were 6.7 times more likely to visit commercial sex workers (P < 0.0001). Sexually transmitted disease prevalence was higher among the drug-users (P < 0.003). CONCLUSIONS: Notwithstanding the small sample size, this study shows that drug-users practice high-risk sexual behavior more frequently. Interventions, in the form of awareness generation and prevention education programs, are required in order to reduce risk of sexually transmitted diseases and HIV transmission among drug-users.

Adult↗

PubMed1991

Racial differences in the risk of invasive squamous-cell cervical cancer.

To investigate reasons for the higher rates of invasive squamous-cell cervical carcinoma among Blacks than Whites in the United States, we examined data from a case-control study of cervical cancer conducted in five geographic areas of the US, supplemented by incidence data from the Surveillance, Epidemiology, and End Results (SEER) Program, and hysterectomy prevalence data from the Cancer and Steroid Hormone Study. We observed only minor differences between Blacks and Whites in the magnitude of relative risks associated with a long interval since last Pap smear, multiple sexual partners, cigarette smoking, a higher number of births, and low levels of income and education. Thus, differences in the strength of associations contributed little to the higher incidence rare in Blacks, but the prevalence of these risk factors, except for cigarette smoking, was higher in Blacks than Whites. The SEER incidence rate ratio of 2.3 for Blacks compared to whites was increased to 2.7 when incidence rates utilized denominators corrected for prevalence of hysterectomy, while the rate difference increased from 14.9 to 25.8 cases per 100,000 person-years (PY). We estimated further that, after adjustment for prevalence of hysterectomy, the incidence rate for women at the lowest levels of exposure to the risk factors evaluated was 2.2 times higher in Blacks than Whites, but that the corresponding rate difference was only 2.2 cases per 100,000 PYs. Thus, our results suggest that racial differences in the prevalence of exposure to identified risk factors account for most of the difference in incidence rates. It remains to be determined what, as yet unidentified, aspects of lower socioeconomic status contribute to the higher incidence rate in Blacks.

Adult↗

PubMed1991

Adolescents AIDS knowledge, attitude and beliefs about preventive practices in Nigeria.

Three hundred ninety-eight randomly selected Nigerian adolescents were surveyed using well structured questionnaires to collect all information on their knowledge, attitude, beliefs and practice regarding AIDS. The questionnaires were carefully administered and analysed. Most of the respondents, aged 10-20 years, were born in metropolitan cities (83.9%), grew up in such cities (93.2%) and have always lived in them (92.7%). Only 37.9% of them knew the causative agent of AIDS, although 96% claimed to have heard of the disease called AIDS. Seventeen percent (17%) knew all the important routes of transmission and 19.1% identified the groups at high risk for contracting AIDS. Limited knowledge and practice of preventive measures were demonstrated. AIDS was identified as a serious health problem for the world but not yet for Nigeria. Nigerian urban youths have been found to be sexually active with multiple sexual partners. Their knowledge of AIDS is limited, and few of them practice preventive measures. They should, thus, be regarded as a high risk group. Coordinated health education programmes coupled with communication and involvement of these youths should be urgently undertaken.

Acquired Immunodeficiency Syndrome↗

PubMed1991

AIDS-related health behavior: coping, protection motivation, and previous behavior.

The purpose of this study was to examine Rogers' protection motivation theory and aspects of Janis and Mann's conflict theory in the context of AIDS-related health behavior. Subjects were 84 heterosexual men and women and 147 homosexual men with multiple sexual partners; LISREL's path-analysis techniques were used to evaluate the goodness of fit of the structural equation models. Protection motivation theory did fit the data but had considerably more explanatory power for heterosexual than for homosexual subjects (49 vs. 22%, respectively). When coping styles were added, different patterns of findings were found among both groups. Adding variables such as social norms and previous behavior increased the explained variance to 73% for heterosexual subjects and to 44% for homosexual subjects. It was concluded that although protection motivation theory did fit the data fairly adequately, expanding the theory with other variables--especially those related to previous behavior--could improve our understanding of AIDS-related health behavior.

Acquired Immunodeficiency Syndrome↗

PubMed1987

Immune impairments and antibodies to HTLVIII/LAV in asymptomatic male homosexuals in Israel: relevance to the risk of acquired immune deficiency syndrome (AIDS).

We have studied 288 Israeli asymptomatic male homosexuals (MHS) to determine the prevalence of antibodies to HTLVI and HTLVIII and their correlation with impairments of the immune system and serum interferon (IFN). Seropositivity for HTLVI, HTLVIII, or both was found in 1.4, 8.3, and 0%, respectively. Significant decreases in the total peripheral T cells, TH cells, and TH/TS ratio as well as elevated alpha IFN serum levels were found in the MHS group in comparison with normal controls. Although no difference in the prevalence of either immune derangements or elevated serum IFN was observed between HTLVIII/LAV-seropositive and HTLVIII/LAV-seronegative MHS, the decreases in total T cells, TH cells, and TH/TS ratios were significantly greater in the seropositive MHS. These results indicate that (a) immune impairments and IFN system activation occur commonly in homosexuals, precede their exposure to HTLVIII/LAV, and probably reflect this group's increased risk for AIDS and (b) HTLVIII/LAV infection of MHS aggravates further their preexisting immune impairments.

Acquired Immunodeficiency Syndrome↗

PubMed1986

[AIDS: each and every one's responsibility].

AIDS is posing challenges at various public health related levels, epidemiological, clinical, social, ethical, legal. In the current absence of possibilities of curative treatment or of vaccine, it is essential to provide sufficient information on the available preventive measures. Given the increase in the numbers of seropositive persons, and the recognition that heterosexual relations area significant transmission route in case of multiple, illknown partners, the need is to actively promote the sale and use of condoms (male preservatives), in risk situations in general (and not only to homosexuals and drug addicts). Among others, a proportion of youth have dangerous behaviors in this regard. Public health leaders as well as those in the social, educational and political fields must adopt a clear stance encouraging the practice of this preventive measure which, literally, can save one's life.

Acquired Immunodeficiency Syndrome↗

PubMed1994

HIV risk factors for persons with serious mental illness.

HIV risk factors were assessed among 120 persons in treatment for serious mental illness. Although subjects had good general knowledge regarding HIV, many engaged in high risk behaviors. Condom use was infrequent among those who had multiple sexual partners, and sharing needles was common for those who used i.v. drugs. Clearly, factual knowledge about HIV was not sufficient to prevent risky behavior. Nearly half of the sample was categorized as at medium to high risk, and almost half of the participants, especially those at medium risk, underestimated their own level of risk. The results suggest that education and intervention strategies should focus on increasing the accuracy of the individual's risk assessment as well as changing attitudes towards condoms and improving skills in using condoms. Assessing personal risk and adopting risk-reduction strategies are the keys to successful AIDS prevention for persons with serious mental illness.

Adult↗

PubMedDate not supplied

Young injectors: a comparative analysis of risk behaviour.

This study compares the injecting and sexual risk-behaviour of young injectors, with injectors over the age of 25. All respondents presented for the first time at the Merchants' Quay Health Promotion Unit between May 1st 1997 and February 28th 1998. Analysis revealed that the young injectors were significantly more likely to report recently borrowing and lending used injecting equipment, and injecting paraphernalia. Regarding sexual risk behaviour, younger respondents were proportionately more likely to report being sexually active, having multiple sexual partners, and having a regular partner who is an injecting drug user. However, they were significantly more likely than older clients to report condom use. The suggestion is that the harm minimisation message, which reached its zenith in the early 1990s, has now been somewhat de-emphasised in both policy and practice. Consequently, it is not reaching the young injectors who have recently initiated intravenous drug use. Additional strategies are needed this group of drug users, in order to promote positive behaviour changes.

Adolescent↗

PubMed2005

Psychosocial, behavioral, and cultural predictors of sexual risk for HIV infection among Latino men who have sex with men.

This study sought to replicate and extend an investigation by Diaz et al. (1999) on determinants of HIV risk among Latino gay and bisexual men living in San Francisco who were predominantly English-speaking. Compared to the Diaz et al. study, the current study sample consisted of predominantly Spanish-speaking MSM, who resided outside of HIV/AIDS epicenters and whose countries of origin were primarily Central & South American. The relationships of unprotected anal sex and multiple sexual partners with demographic, developmental, behavioral, cultural and psychosocial variables were examined. Data were collected in a convenience sample of 250 participants (primarily immigrants from El Salvador) residing in Virginia. Most men in the sample had more than one sexual partner in the last 3 months (62%) and more than a third had unprotected anal sex with a casual partner in the same time period. Communication about HIV, sexual attraction, machismo, and experiences of discrimination based on homosexual behavior were predictive of HIV risk behaviors. The findings support an integrative approach to investigating HIV risk among Latino MSM. Implications for prevention programs are discussed.

Adult↗