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Biomedical subjects

C H Hu

Publications and source records attributed to C H Hu.

86 records · Page 5Linked to original sources
PubMed1982

Lipid synthesis in cutaneous xanthoma.

In vitro lipogenesis was studied on the xanthoma tissue from 6 patients with normal plasma lipids and 4 patients with hyperlipidemia. Xanthoma tissue was incubated at 37 degrees C for 6 hr in Krebs-Ringer phosphate buffer containing sodium [14C]acetate. The radioactivity of each lipid class was determined after extraction and separation of lipids. The incorporation of acetate into all major lipid groups was much greater in xanthoma tissue than in control normal-appearing skin. There was no difference in the incorporation pattern of 14C between xanthomas of patients with normal plasma lipids and those of hyperlipidemic patients. The data exemplify considerable in situ lipid synthesis of xanthoma tissue. Although the lipids in xanthomas of hyperlipidemic persons may be derived from plasma, the plasma origin of xanthoma lipids in normolipidemic persons remains to be confirmed, and the contribution of local lipogenesis cannot be ignored. The lipids in cutaneous xanthomas are most likely derived from a multiple input system.

Acetates↗
PubMed1982

Response of nodular non-X histiocytosis to vinblastine.

Progressive cutaneous papulonodular non-X histiocytosis of the face and proximal parts of the extremities developed in a 28-year-old woman. Histologic study showed masses of benign histiocytes with foci of lymphocytes. Occasional cells contained diastase-resistant cytoplasmic polysaccharide that stained positive with PAS stain. No iron, fat, or Touton or other giant cells were present. Ultrastructural study disclosed laminar bodies but no Langerhans' cells or Langerhans' granules. The process responded to low-dose intravenous vinblastine sulfate treatment.

Adult↗
PubMed1981

Lennert's lymphoma presenting with clusters of cutaneous infection.

We recently diagnosed and studied a case of Lennert's lymphoma in a young black man who presented with a chronic pyoderma and multiple cutaneous infections of viral origin. Lennert's lymphoma, or malignant lymphoma with a high content of epithelioid histiocytes, is an uncommon variant of non-Hodgkin's lymphoma. This report highlights the role of idiopathic immunosuppression in lymphoma patients.

Adult↗
PubMed1979

Corticosteroids, aurothioglucose and soybean trypsin inhibitor do not prevent pemphigus antibody-induced acantholysis in vitro.

Hydrocortisone, triamcinolone acetonide, aurothioglucose and soybean trypsin inhibitor were added to normal human skin explants cultured with IgG from pemphigus serum to determine if acantholysis could be prevented. At the therapeutic concentrations used none of these compounds prevented binding of the autoantibody to the epidermal target cells, and none prevented acantholysis. These experiments support the concepts that the pemphigus antibody alone is responsible for producing the acantholytic lesions of pemphigus, that the therapeutic effectiveness of steroids and gold salts is probably due to their ability to reduce serum autoantibody titres and that pemphigus acantholysis is probably not caused by a serine proteinase.

Acantholysis↗
PubMed1978

Dermal duct tumor: a histochemical and electron microscopic study.

The histochemical and electron microscopic findings in seven cases of dermal duct tumor are described. All seven of the patients were elderly, and five were women. The tumors were small flesh-colored or red papules located most often on the head and neck region. Intense phosphorylase and moderate respiratory enzymes characterized the histochemical reaction of the tumors. The following three types of tumor cells were recognized ultrastructurally: clear, dark, and luminal. The tumor was principally composed of clear cell proliferation around a regular ductal lumen. In addition, melanocytes, Langerhans' cells, and lymphocytes were occasionally seen within the tumor masses. An intact basal lamina and few hemidesmosomes with no detectable actin-like microfilaments were the features of the tumor-stroma interface. Our study results showed that the dermal duct tumor is a benign tumor with eccrine dermal ductal differentiation.

Aged↗
PubMed1978

Epidermal acantholysis induced in vitro by pemphigus autoantibody. An ultrastructural study.

Suprabasilar acantholysis can be produced in organ culture of normal human skin in the presence of pemphigus IgG autoantibody. We have examined this in vitro system by electron microscopy. The earliest ultrastructural changes at 12 hours included widening of the intercellular spaces and disruption of the intercellular cement substance in the nondesmosomal areas. After 24 to 48 hours in culture, the tonofilaments retracted from the cell periphery, desmosomes were lost, and extensive cell surface digitation occurred. By 72 hours, isolated cells without noticeable desmosomes were seen in the suprabasilar areas, whereas basal cells, with intact hemidesmosomes, remained attached to the basal lamina. Control cultures which were grown in the presence of normal IgG or F-10 medium alone did not manifest these changes. The ultrastructural features support the conclusion that the acantholysis produced in this system is similar and probably identical to that of naturally occurring pemphigus.

Acantholysis↗
PubMed1977

Cutaneous manifestations of Wegener granulomatosis.

In a series of 19 patients (15 male and 4 female) who had Wegener granulomatosis with specific cutaneous histopathologic findings, the skin was only involved at onset in two. Four distinct histologic subgroups were defined as follows: necrotizing vasculitis (11 patients); necrotizing palisading granuloma (Churg-Strauss lesion) 2 patients); granulomatous vasculitis (2 patients); and lymphomatoid granulomatosis (4 patients). The 11 patients with necrotizing vasculitis had purpuric and hemorrhagic lesions, and the presence of vesicles and ulceration correlated with the severity of onset and extent of disease. The remaining eight patients had papular and nodular lesions. The patients with necrotizing vasculitis and lymphomatoid granulomatosis had a worse prognosis that did those with a predominant granulomatous reaction.

Adolescent↗
PubMed1977

Unusual normolipidemic cutaneous xanthomatosis: a comparison of two cases illustrating the differential diagnosis.

A patient who developed diffuse normolipidemic plane xanthomas also presented with IgG lambda monoclonal gammopathy, hypernephroma, an unusual family cluster of leukemia (with two family members in two generations), and a unique, acquired C1-esterase inhibitor deficiency. A second patient presented with widespread normolipidemic papular xanthomas in which histiocytes containing Langerhans' granules were found. The lipid composition of the lesions of these two patients showed striking differences. Excesses of triglycerides and cholesterol ester were demonstated in plane xanthoma, whereas phospholipids were prominent in the popular xanthoma of histiocytosis X. We present and classify these two cases to emphasize the diagnostic value of chemical and ultrastructural studies of normolipidemic cutaneous xanthomatosis.

Adult↗
PubMed1976

On the nature of desmoplastic melanoma.

Pathologic study demonstrated lentigo maligna melanoma in three of four cases of desmoplastic melanoma and demonstrated spindle cell masses with features of atypical fibroxanthoma in all four of the cases. Pigment enzymes of melanosomes were not found in the mesenchymal portion of the tumor. The cellular atypia and the histochemical and ultrastructural findings favor the fibroblastic nature of this melanoma-related dermal mass.

Aged↗