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Ann Dermatol Venereol 2002 May;129(5 Pt 2):783-6
Implication of VEGF, steroid hormones and neuropeptides in hair follicle cell responses
Human hair follicles progress independently through the anagen, catagen, telogen and latency phases that correspond to growth arrest and hair shedding before initiation of a new anagen phase. Hair follicles are self-renewing and contain reservoirs of multi-potent stem cells. Identification of the messenger molecules and pathways operating in the growth and cycling of hair follicles, have provided substantial data. However, only a limited number of these signals is well understood. The specific response of hair follicle cells to these signals is correlated with the expression of their corresponding receptors. What regulates these responses? In this review, we will focus on the hair cycle and its control mechanisms. We will provide some elements in answer to these questions and present some of the markers of hair follicle cells, and hormonal and vascular growth factors, which may regulate respectively hair follicle cell metabolism and cycle, and the neuropeptide impact on hair follicle response and hair growth. The results of our study show the modifications in various expression patterns of receptors in dermal papilla cells, and demonstrate the cross-interaction between these different components. In conclusion, we present an accumulation of evidence suggesting that the regulation of hair growth requires a combination of hormonal, vascular and neuropeptide approaches that will provide further insight in defining new treatments for hair loss.
Clin Exp Dermatol 2002 Jul;27(5):366-72
Clinical relevance of hair microscopy in alopecia.
Hair microscopy can clarify the cause of hair loss in a range of diagnoses. Most of these are associated with hair breakage, the rest are related to lack of growth. Hair breakage may be due to excessive trauma or underlying susceptibility, where structural clues may be present. Lack of growth reflects follicular dynamics and represents the central mechanism of most common causes of alopecia. In such conditions, microscopy only reveals nonspecific confirmation of short anagen. Although this may assist clinical diagnosis, microscopy in alopecia only allows exclusion of diagnoses related to hair breakage. Confidence in the outcome of hair microscopy is based on the size of the sample of hairs, the length of the hair, the characteristics of the observations and the experience of the person undertaking the microscopy.
Br J Dermatol. 2003 Jun;148(6):1205-11.
Female alopecia: the mediating effect of attachment patterns on changes in subjective health indicators.
Background The interrelationship between female alopecia and psychological disorders is complex, with a range of psychosocial consequences, but also antecedents. Psychosocial antecedents are to a large extent interpersonal and can be assumed to have a mediating effect on health care utilization and subjective health. Objectives To analyse whether changes in health-related quality of life (QoL) are mediated by relational or attachment styles and whether these styles are associated with a particular, dysmorphophobic type of alopecia. Methods Seventy-four women with androgenetic and diffuse alopecia underwent psychological assessment at the first consultation at a university clinic and at 2 months' follow-up. Attachment styles were evaluated by an observer rating scale. As a primary endpoint a disease-specific QoL instrument was employed. Results Findings indicated an association between patients with nonvisible hair loss and the ambivalent attachment style. Global clinical impressions and attachment indicators, e.g. attachment security and coping strategies, showed significant contributions in predicting changes in the QoL scales 'self-esteem' and 'emotions'. Conclusions These findings suggest that attachment security may be one of the underlying mechanisms mediating subjective health and that a specific attachment vulnerability can be identified in a subgroup of patients with female alopecia. Future studies will have to focus on the relevance of attachment patterns in the doctor-patient relationship and on psychotherapeutic interventions.
Cell Struct Funct. 2003 Feb;28(1):97-104.
Autoimmune hair loss induced by alloantigen in C57BL/6 mice.
Exponentially growing Meth-A cells expressing H-2K(d).D (d) antigen were found to induce alopecia when injected intraperitoneally into normal C57BL/6 mice, which express the H-2K(b).D (b) antigen. However, the capacity to induce alopecia disappeared when Meth-A cells were treated with K252a, which inhibits protein kinases. Histologically, skin in affected areas showed dense mononuclear cell infiltration and a focal foreign-body giant-cell reaction in hair follicles. The subtyping of lymphocytes in peripheral blood demonstrated a significant difference between normal mice and Meth-A cell-injected mice. To further examine the mechanism by which the alloantigen induces alopecia, lymphocytes isolated from the peripheral blood of normal C57BL/6 mice were cultured in medium containing Meth-A cell homogenate, phytohemagglutinin (PHA) and recombinant mouse interleukin-2 (rm IL-2), and intravenously injected into normal C57BL/6 mice. The adoptive transfer of the lymphocytes induced alopecia in a similar way. These findings suggest that the protein kinase-modulated alloantigen induces alopecia by disturbing the immunological homeostasis, and that lymphokine-activated killer cells play an important role in induction of alopecia by cross-reacting with hair follicles.
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