Occurrence and localization of transforming growth factor-beta (TGF-beta 1, beta 2) during rabbit skin development.
The expression of (TGF beta-1) and (TGF beta-2) in adult, fetal, and neonatal rabbit skin has been analyzed by immunohistochemistry. Samples were collected from the backs of fetal rabbits (23 and 30 days of gestation), newborn rabbits (1 day post-partum) and adult pregnant and nonpregnant rabbits. Forty samples were studied. To identify TGF-beta two antibodies were used: (RAB4) and (CL-B1/29). TGF-beta 1 and TGF-beta 2 displayed distinct distribution and intensity of staining at different stages of development. TGF-beta 1 was present in fetal skin (23 days of pregnancy) expressing abundant staining in cells within epidermis, dermis and hypodermis. Fetal skin (30 days of pregnancy) exhibited weak staining for TGF-beta 1; only isolated dermal cells in close proximity to hair follicles and sweat glands expressed intracellular staining. Newborn rabbit skin showed low expression for TGF-beta 1, around hair follicles and sweat glands. In contrast adult pregnant and non-pregnant rabbit skin exhibited abundant staining for TGF-beta 1 in epidermis, papillary dermis, around hair follicles, sweat glands, and blood vessels, no difference was observed among pregnant and non-pregnant rabbits. TGF-beta 2 was detected in all specimens and the distribution and intensity of staining were similar to those found for TGF-beta 1 in all groups. Our findings demonstrate that the expression of TGF-beta 1 and TGF-beta 2 is intense during early stages of rabbit skin development when morphogenesis is taking place and skin appendages are being formed; and less intense when these structures are formed and skin growth predominates. These results suggest an important role for TGF-beta 1 and TGF-beta 2 in rabbit skin development, probably regulating morphogenesis and growth.
Porras-Reyes
B H
BH
Division of Plastic Surgery, Washington University School of Medicine, St. Louis, Missouri.
Ksander
G
G
Weeks
P M
PM
D000375:Aging / Q000378:metabolism*; D000818:Animals; D000906:Antibodies / Q000032:analysis / Q000276:immunology; D001808:Blood Vessels / Q000737:chemistry / Q000378:metabolism; D005260:Female; D005333:Fetus / Q000737:chemistry / Q000378:metabolism; D006197:Hair / Q000737:chemistry / Q000378:metabolism; D007150:Immunohistochemistry; D009024:Morphogenesis; D011247:Pregnancy; D011817:Rabbits; D012867:Skin / Q000737:chemistry* / Q000254:growth & development / Q000378:metabolism; D013545:Sweat Glands / Q000737:chemistry / Q000378:metabolism; D016212:Transforming Growth Factor beta / Q000032:analysis* / Q000276:immunology / Q000378:metabolism
D000906:Antibodies; D016212:Transforming Growth Factor beta