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An investigation of apoptosis in androgenetic alopecia.
Ann Clin Lab Sci. 2003 Winter; 33(1):107-12.AC

Abstract

While the androgens, including dihydrotestosterone (DHT), have been implicated in the development of androgenetic alopecia (AGA), the exact mechanism by which they exert their effect(s) is unknown. Since apoptosis is an integral component of the normal cycling of human hair, we investigated individuals clinically affected by AGA to assess whether objective differences in the expression of apoptosis-related immunohistochemical markers could be observed in scalp biopsies. Specimens from 16 alopecic male patients were stained with bd-2 and the terminal deoxynucleotidyltransferase dUTP fluorescein nick end-labeling (TUNEL) method was used to assess apoptotic activity in affected and unaffected areas ofthe scalp. Immunoreactivity was analyzed by quantifying staining differences within the same individual. Sections from 3 human volunteers were used to establish the method validity. Significant differences in the bcl-2 staining index (0.67 versus 0.42, p < 0.05) and TUNEL expression (5.7 versus 10.2, p < 0.05) were observed between the areas of the scalp that were clinically affected (frontal) and unaffected (occipital) by AGA. The Gaussian distributions of bcl-2 and TUNEL staining suggest that a relatively uniform population of follicles exists at the frontal hairline and/or that synchrony of follicular cycling occurs in AGA. The apoptosis "hot spot" revealed by TUNEL staining in the bulge-isthmus region of the murine follicle is also identifiable in the human follicle.

Authors+Show Affiliations

Morgan MB
Department of Pathology, College of Medicine, University of South Florida,Tampa, Florida, USA. mbkmmorgan@aol.com
Rose P
No affiliation info available

MeSH

AlopeciaApoptosisCell CycleHair FollicleHumansImmunohistochemistryIn Situ Nick-End LabelingMaleProto-Oncogene Proteins c-bcl-2Scalp

Pub Type(s)

Journal Article

Language

eng

PubMed ID

12661906

Citation

Morgan, Michael B., and Paul Rose. "An Investigation of Apoptosis in Androgenetic Alopecia." Annals of Clinical and Laboratory Science, vol. 33, no. 1, 2003, pp. 107-12.
Morgan MB, Rose P. An investigation of apoptosis in androgenetic alopecia. Ann Clin Lab Sci. 2003;33(1):107-12.
Morgan, M. B., & Rose, P. (2003). An investigation of apoptosis in androgenetic alopecia. Annals of Clinical and Laboratory Science, 33(1), 107-12.
Morgan MB, Rose P. An Investigation of Apoptosis in Androgenetic Alopecia. Ann Clin Lab Sci. 2003;33(1):107-12. PubMed PMID: 12661906.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - An investigation of apoptosis in androgenetic alopecia. AU - Morgan,Michael B, AU - Rose,Paul, PY - 2003/3/29/pubmed PY - 2003/10/2/medline PY - 2003/3/29/entrez SP - 107 EP - 12 JF - Annals of clinical and laboratory science JO - Ann Clin Lab Sci VL - 33 IS - 1 N2 - While the androgens, including dihydrotestosterone (DHT), have been implicated in the development of androgenetic alopecia (AGA), the exact mechanism by which they exert their effect(s) is unknown. Since apoptosis is an integral component of the normal cycling of human hair, we investigated individuals clinically affected by AGA to assess whether objective differences in the expression of apoptosis-related immunohistochemical markers could be observed in scalp biopsies. Specimens from 16 alopecic male patients were stained with bd-2 and the terminal deoxynucleotidyltransferase dUTP fluorescein nick end-labeling (TUNEL) method was used to assess apoptotic activity in affected and unaffected areas ofthe scalp. Immunoreactivity was analyzed by quantifying staining differences within the same individual. Sections from 3 human volunteers were used to establish the method validity. Significant differences in the bcl-2 staining index (0.67 versus 0.42, p < 0.05) and TUNEL expression (5.7 versus 10.2, p < 0.05) were observed between the areas of the scalp that were clinically affected (frontal) and unaffected (occipital) by AGA. The Gaussian distributions of bcl-2 and TUNEL staining suggest that a relatively uniform population of follicles exists at the frontal hairline and/or that synchrony of follicular cycling occurs in AGA. The apoptosis "hot spot" revealed by TUNEL staining in the bulge-isthmus region of the murine follicle is also identifiable in the human follicle. SN - 0091-7370 UR - https://www.unboundmedicine.com/medline/citation/12661906/An_investigation_of_apoptosis_in_androgenetic_alopecia_ DB - PRIME DP - Unbound Medicine ER -