Search PubMed⌕ Search

Biomedical subjects

A K Bhalla

Publications and source records attributed to A K Bhalla.

At least 19 recordsLinked to original sources
PubMed1992

Nail-patella syndrome associated with mixed crystal deposition arthropathy.

This report describes a case of nail-patella syndrome in a woman with a strong family history who presented with effusions in her shoulder and knees. Microscopic examination of the shoulder fluid suggested the presence of calcium pyrophosphate dihydrate (CPPD) crystals, and examination of the knee fluid suggested both hydroxyapatite (HAP) and CPPD crystals. To our knowledge, the coexistence of these two conditions has not been reported in the past. Moreover, it brings up a new element regarding the inflammatory origin of the nail-patella syndrome.

Arthritis↗
PubMed1992

Pseudoarthroplastic' hand in arthritis mutilans.

A 46-year-old man with arthritis mutilans and hand radiographic appearance suggestive of previous surgery is described. We propose the term 'pseudoarthroplastic' hand for this radiological finding.

Adult↗
PubMed1992

Pregnancy following infertility.

Pregnancies of 112 patients who had conceived after a history of a minimum of 2 years of infertility were compared to an equal number of matching controls without prior infertility to find out any risk of increased pregnancy complications. These patients were at a significantly higher risk of developing first trimester bleeding, antepartum haemorrhage and intrauterine fetal death. Also there were higher rates of preterm delivery and Caesarean section. The patients in the study group had a significantly higher number of stillborn babies. The incidence of other complications such as ectopic pregnancy, multiple pregnancy, and medical complications was also higher in these patients but the difference was not statistically significant.

Adult↗
PubMed1992

Reliability of skinfold calipers as a tool for measuring body fat in human beings.

Triceps skinfold thickness measured in ten adults aged 19 to 50 yr by a Holtain skinfold caliper, was compared with subcutaneous fat thickness obtained on cross-sections of the left upper arm by computerized axial tomography (CAT). The thickness of subcutaneous fat was measured on CAT scan film directly with the inbuilt computer graphic technique. The measurements taken on CAT scan film were found to be significantly higher (by 21-45%; P less than 0.001) than those by the skinfold calipers. Our findings suggest that skinfold calipers may not be very accurate tools for the assessment of body fat in human beings. Therefore, its use in the determination of body composition, for which great precision is required calls for re-thinking.

Adipose Tissue↗
PubMed1991

Regulation of interleukin-1 and tumour necrosis factor gene expression in myelomonocytic cell lines by 1,25-dihydroxyvitamin D3.

1,25-dihydroxyvitamin D3[1,25-(OH)2D3] is capable of regulating cells in the immune system and affects cytokine production by both T lymphocytes and by monocytes. We examined the effects of 1,25-(OH)2D3 on the regulation of interleukin-1 beta (IL-1 beta) and tumour necrosis factor-alpha (TNF-alpha) genes in HL-60 and U937 cells. 1,25-(OH)2D3 alone only induced low level expression of the genes for these cytokines. Phorbol 12-myristate 13-acetate (PMA) strongly induced the transcription of these genes, whilst the addition of 1,25-(OH)2D3 to PMA-stimulated cells caused a further dose-dependent synergistic increase in the mRNA for both cytokines in U937 cells. In PMA-stimulated HL-60 cells, 1,25-(OH)2D3 increased the mRNA for IL-1 beta but not that for TNA-alpha, These differences may be related to the different stage of myeloid differentiation in HL-60 and U937 cells.

Blotting, Northern↗
PubMed1990

Ultrasonographic localization for renal biopsy.

One hundred and fifty consecutive percutaneous renal biopsies were performed using ultrasonography to localise the site and depth of the lower pole of the left kidney. Renal tissue was obtained in 95% of cases and an accurate histopathological diagnosis was reached in 89% of patients. Gross haematuria following the procedure occurred in 6%, but was usually transient. No other complications were encountered. Ultrasonographic marking of the biopsy site and depth is a quick, simple, accurate and safe method of localizing the kidney for the purpose of a biopsy.

Biopsy↗
PubMed1989

Early regulation of c-myc mRNA by 1,25-dihydroxyvitamin D3 in human myelomonocytic U937 cells.

The effects of 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3; 10 nmol/l) on the human monomyelocytic cell line U937 were investigated. Addition of 1,25-(OH)2D3 led to a decrease in cell proliferation which fell at 72 h to 67.8 +/- 4.3% (mean +/- S.E.M.) of control values. The presence of CD14, a surface marker found on mature monocytes/macrophages but not on U937 cells, was detectable as early as 18 h and peaked at 48 h, when 63.6 +/- 4.2% of the cells were positive. However, changes in c-myc mRNA levels were detected earlier, starting within 4 h of exposure to the hormone and being reduced to 38 +/- 8.2% of control values of 24 h. These effects were reversible after removal of the hormone, with the same sequence of events seen following addition of the hormone. There was first an increase in c-myc mRNA levels, starting within 2 h and reaching control values by 24 h. These changes were followed by loss of CD14 which became undetectable after 72 h. Proliferation recovered slowly and incompletely, since it was 81.7 +/- 0.7% of control after 72 h. A constant reciprocal relationship between c-myc mRNA and CD14 levels was found both in the presence and after removal of 1,25-(OH)2D3. Regulation of U937 cell proliferation and maturation by 1,25-(OH)2D3 is thus preceded by early modulation of c-myc mRNA.

Blotting, Northern↗
PubMed1989

1,25-Dihydroxyvitamin D3, but not retinoic acid, induces the differentiation of U937 cells.

We have examined the effects of vitamin D3 metabolites and retinoic acid on the myelomonocyte cell line U937. Inhibition of proliferation, measured by incorporation of 125iodo-deoxyuridine was seen at 72 h with 1,25-(OH)2D3 but not 25(OH)D3 or 24, 25(OH)2D3 metabolites. CD14 molecules, not normally present on U937 cells, were induced on the cell surface. However, Class II major histocompatibility complex (MHC) molecules were not induced and Class I MHC molecules not increased in density as determined by flow cytometry. Retinoic acid inhibited proliferation but failed to induce CD14 molecules. These data suggest that both 1,25(OH)2D3 and retinoic acid act as an antiproliferation signal to U937 cells; only 1,25-(OH)2D3 induces the differentiation towards a more mature phenotype.

Calcitriol↗
PubMed1989

Palpebral fissure length in normal infants.

Somatometric data on the size of palpebral fissure have been presented on 211 normal infants. The palpebral fissure length was derived from the inner canthal and outer canthal distances measured at different age levels. The size of palpebral fissure at birth (1.79 +/- 0.17 cm) is 76.8% of the value attained by it at 4-6 months age (2.33 +/- 0.09 cm), and 76.2% of the size at 10-12 months age (2.35 +/- 0.10 cm). Values for inner canthal and outer canthal distances measured at birth are also presented. The data provided are expected to assist objective evaluation of disorders affecting the size of palpebral fissure during infancy.

Anthropometry↗
PubMed1987

Human articular chondrocytes acquire 1,25-(OH)2 vitamin D-3 receptors in culture.

The vitamin D endocrine system is crucial in calcium homeostasis in mammalian species. Central to this role 1,25-dihydroxyvitamin D-3 (1,25-(OH)2D3) receptors have been detected in freshly isolated osteoblast-like bone cells and it has been shown that the active metabolite of vitamin D-3 1,25-(OH)2D3, increases bone resorption in vitro and in vivo. The requirement of 1,25-(OH)2D3 for the normal development of growth plate cartilage can be seen in vitamin D deficient rickets. However, there is still considerable controversy regarding the presence of 1,25-(OH)2D3 receptors in chondrocytes. In this paper, we report the presence of a 3.5-S 1,25-(OH)2D3-binding macromolecule in freshly isolated human costal but not articular chondrocytes. After subculture, both articular and costal chondrocytes have receptors. Saturation binding analysis revealed a single class of binding sites with an apparent Kd of 0.09 nM and approx. 2700 receptor molecules per cell for articular chondrocytes and a Kd of 0.1 nM and approx. 2000 receptor molecules per cell for costal chondrocytes. The presence of 1,25-(OH)2D3 receptors did not correlate with the switch from synthesis of cartilage-specific type II collagen to types I and III collagens. The acquisition of 1,25-(OH)2D3 receptors by articular chondrocytes may, therefore, be another phenotypic characteristic of cultured cells or may appear in vivo when chondrocytes are exposed to vascular or inflammatory cell products.

Adult↗