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Biomedical subjects

D Greenspan

Publications and source records attributed to D Greenspan.

At least 145 records · Page 8Linked to original sources
PubMed1987

Oral mucosal manifestations of AIDS?

Oral lesions of opportunistic infections and neoplasms are associated with immunosuppression caused by the human immunodeficiency virus (HIV). These include oral candidiasis, viral lesions such as warts, herpes simplex, herpes zoster and hairy leukoplakia, as well as Kaposi's sarcoma and an aggressive form of periodontal disease. Many of these can occur as the first clinical signs of HIV infection. Thus, careful oral examination is an important part of the clinical evaluation.

Acquired Immunodeficiency Syndrome↗
PubMed1986

Five-year survival of patients with oral cancer and its association with antibody to herpes simplex virus.

Levels of antibody to herpes simplex virus type 1 (HSV-1) were measured in 70 patients with untreated squamous cell carcinoma of the mouth. After treatment the actuarial survival was determined at quarterly intervals for 5 years and was found to be associated with the pretreatment level of antibody to the virus. Patients with levels of IgM antibody to HSV-1 which were above the median level had a 5-year survival of only 56% whereas those with levels below the median had a higher survival of 72%. Patients with no detectable IgM antibody to HSV-1 had a 5-year survival of 81%. The reverse was seen with IgG antibody to HSV-1. Patients with higher than the median level of IgG antibody had a 5-year survival of 73%, whereas those with IgG antibody below the median had a 5-year survival of 56%. No relationship was seen between survival and levels of IgA antibody to HSV-1, or between survival and antibody of any class to cytomegalovirus. The data are consistent with the reported association between oral cancer and HSV-1.

Aged↗
PubMed1986

Involvement of the 5'-leader sequence in coupling the stability of a human H3 histone mRNA with DNA replication.

Two lines of evidence derived from fusion gene constructs indicate that sequences residing in the 5'-nontranslated region of a cell cycle-dependent human H3 histone mRNA are involved in the selective destabilization that occurs when DNA synthesis is terminated. The experimental approach was to construct chimeric genes in which fragments of the mRNA coding regions of the H3 histone gene were fused with fragments of genes not expressed in a cell cycle-dependent manner. After transfection in HeLa S3 cells with the recombinant plasmids, levels of fusion mRNAs were determined by S1 nuclease analysis prior to and following DNA synthesis inhibition. When the first 20 nucleotides of an H3 histone mRNA leader were replaced with 89 nucleotides of the leader from a Drosophila heat-shock (hsp70) mRNA, the fusion transcript remained stable during inhibition of DNA synthesis, in contrast to the rapid destabilization of the endogenous histone mRNA in these cells. In a reciprocal experiment, a histone-globin fusion gene was constructed that produced a transcript with the initial 20 nucleotides of the H3 histone mRNA substituted for the human beta-globin mRNA leader. In HeLa cells treated with inhibitors of DNA synthesis and/or protein synthesis, cellular levels of this histone-globin fusion mRNA appeared to be regulated in a manner similar to endogenous histone mRNA levels. These results suggest that the first 20 nucleotides of the leader are sufficient to couple histone mRNA stability with DNA replication.

Animals↗
PubMed1986

Phenotypic identification of mononuclear cells in oral premalignant lesions and cancer by monoclonal antibodies.

To explore the nature and importance of mononuclear cells of different phenotypes in oral premalignant lesions and oral cancer, we studied biopsy specimens from 21 oral red and/or white lesions (6 hyperkeratosis, 3 mild dysplasia, 4 severe dysplasia and 8 squamous cell carcinoma), using monoclonal antibodies and avidin-biotin-peroxidase complex staining. Peripheral blood samples (PB) from 4 normal subjects and 5 reactive lymph nodes (LN) were used as controls for the technique. T11-positive cells were the predominant phenotype (74-78%) in all cases examined. The T4/T8 ratio in severe dysplasia was significantly lower than that in mild dysplasia (p less than or equal to 0.05). These observations support the hypothesis of a role for cellular immune responses in oral premalignant lesions and oral cancer. The predominance of T cells may represent the local expression of immunity against antigens (viral or other). The decreased T4/T8 ratio observed in severe dysplasia may represent a transitory stage of local immunosuppression, which may be of critical importance for the progression into carcinoma. Phenotypic variations in mononuclear cell infiltrates in these conditions could be diagnostic value.

Adult↗
PubMed1986

Oral melanoma: report of case.

A case is presented of a patient whose death might have been prevented if the dentist had been aware of the malignant potential of a benign-appearing oral mucosa pigmentation. Early recognition, diagnosis, and treatment of pigmented oral lesions are emphasized.

Diagnosis, Differential↗
PubMed1986

Oral findings in people with or at high risk for AIDS: a study of 375 homosexual males.

A total of 375 homosexual males were studied to assess the dental findings, life-style, and risk factors during a 4-year period. At baseline, 136 of the patients were diagnosed as having AIDS, 116 were considered at risk for AIDS, and 123 were considered healthy. In a mean follow-up time of 23 months, nine of the patients at risk for AIDS and five of the patients considered healthy were diagnosed as having AIDS. Kaposi's sarcoma was the most common oral neoplasm, and candidiasis was the most frequent oral infection. Hairy leukoplakia was found in 28% of the patients, and periodontal disease was found in 17% of the patients. Carriers of the AIDS virus may not be identified easily and control measures in the dental office must be followed.

Acquired Immunodeficiency Syndrome↗
PubMed1985

Replication of Epstein-Barr virus within the epithelial cells of oral "hairy" leukoplakia, an AIDS-associated lesion.

We conducted a study to identify the viruses in tissue specimens of oral "hairy" leukoplakia, a lesion that is found in immunosuppressed male homosexuals and that is associated with the subsequent development of the acquired immunodeficiency syndrome. When stained for papillomavirus core antigen, 49 of 67 biopsy specimens (73 per cent) yielded positive results in epithelial-cell nuclei. Electron microscopy showed papillomavirus-like particles in all of 25 specimens, and the herpes-type virus described in a previous report was seen in 23 of the 25 specimens. Three specimens had both types of particle in the same individual epithelial cells. Immunofluorescence for herpes simplex virus, varicella-zoster virus, and cytomegalovirus gave negative results in all cases, but 19 of 20 specimens showed intense nuclear staining in epithelial cells for the viral capsid antigen of Epstein-Barr virus (EBV). DNA hybridization using EBV probes in Southern blots demonstrated EBV DNA in all of 13 specimens and found 200 or more viral DNA molecules per cellular genome in 11 of the 13. The whole EBV genome was also demonstrated in the specimens and found to be in linear virion form. We conclude that EBV replicates within the epithelial cells in hairy leukoplakia.

Acquired Immunodeficiency Syndrome↗
PubMed1985

Expression of influenza virus NS2 nonstructural protein in bacteria and localization of NS2 in infected eucaryotic cells.

The nonstructural NS2 protein of influenza A/PR/8/34 virus was efficiently expressed in bacteria, and monospecific antisera were prepared against the bacterially synthesized polypeptide. These antisera were cross-reactive among the NS2 proteins of various influenza A viruses. However, they did not react with the NS2 of influenza B/Lee/40 virus nor with other proteins of influenza A viruses such as NS1. Antisera against NS2 were used to determine that the NS2 protein is localized in the cell nucleus during influenza virus infection, as shown by immunofluorescence microscopy. Cells infected with simian virus 40 recombinants containing the influenza virus NS gene revealed that both the NS1 and NS2 proteins appeared in the nucleus, even in the absence of expression of other influenza virus-specific components.

Animals↗