Evidence for the expression of the EGF receptor on human monocytic cells.

Several malignancies over-express the epidermal growth factor receptor, ligation of which results in cellular differentiation and multiplication. Mononuclear phagocytes secrete this cytokine and its receptor has been detected on microglial cells. This communication describes the expression (and its regulation) of epidermal growth factor receptor (EGFR) on U937 cells. We have shown that a few are EGFR-positive, with expression being up regulated by interleukin 6 (IL-6). Also, when cultured in the presence of serum with the monoclonal anti-EGFR, ICR62, U937s showed a reduced growth rate. By contrast, ICR9 caused a significant increase in cellular proliferation. Both antibodies induced cycle arrest in late G(1)/S phase. When the cells were cultured in the absence of serum, low antibody concentration (10 microg/ml) showed an early inhibitory effect on cell proliferation. By contrast, at high antibody concentrations (50 micro/ml), ICR62 significantly increased the proliferation of U937 cells. We suggest that these results provide indirect evidence for an autocrine action of EGF on U937 cells.

Mitochondrial genome organization and expression associated with cytoplasmic male sterility in sunflower (Helianthus annuus).

A comparative investigation of the organization and expression of the mitochondrial genome in fertile and cytoplasmic male sterile (CMS) sunflower (Helianthus annuus) has been undertaken. A region of mitochondrial genome variation between the two phenotypes has been located in the 3' flanking region of the gene encoding the alpha subunit of the F1 ATPase (atpA). Physical mapping and sequence analysis have been used to show that a rearrangement involving an inversion and an insertion has occurred immediately downstream of the atpA coding region in the mitochondrial DNA from sterile sunflower. This rearrangement has resulted in the creation of a new open reading frame (ORFc) which is co-transcribed with atpA in sterile sunflower. In organello labelling of mitochondrial translation products from the two types of sunflower shows that a 15 kDa protein is synthesized by the mitochondria from sterile sunflower but not by those from fertile plants. The ORFc sequence could encode this 15 kDa protein which may be causally related to the CMS phenotype.

An enquiry into death and dying at the Adelaide Children's Hospital: a useful model?

As a result of a desire amongst the hospital staff to improve the management of dying children and their families, a four person subcommittee was appointed to investigate this area of care. Nineteen persons were interviewed (15 hospital staff members and four parents) and 12 written submissions were received (10 from staff and two from parents) over a 10 week period. An analysis of one year's deaths of Adelaide Children's Hospital patients showed that most took place in the hospital and about one in five were at home. Nearly 60% occurred in children aged 0-5 years, 15% in those aged 6-10 years, 15% in those aged 11-15 years, and 13% in children aged more than 15 years. The four commonest causes of death were: cancer (27%), congenital abnormalities (19%), sudden infant death syndrome (SIDS) (16%), and trauma (11%). Sudden unexpected deaths are most common, particularly for infants. Recommendations included improved privacy for families and friends; more sensitive body viewing, mortuary, autopsy and funeral arrangements; and better in-service education for staff and information giving for families. Areas of insufficient staff support were identified and the appointment of a specialist palliative care clinical nurse consultant was proposed. Stronger links with palliative and hospice care teams, general practitioners and community nurses were suggested. Addressing the issues of living and dying, and working through the stages of grief are integral parts of long term clinical care. The need for good continuity of psychosocial support was a recurring theme. More awareness of the availability of the specialised pain relief service was required. Ethical issues should be addressed as part of the general development of education and information services. The advantages and limitations of the enquiry are discussed and the model is proposed as a potentially useful one for both paediatric and adult palliative care and hospice care service development.