Yoshiko Hisamatsu

Kurume University, Куруме, Fukuoka, Japan

Are you Yoshiko Hisamatsu?

Claim your profile

Publications (6)20.27 Total impact

  • British Journal of Dermatology 01/2006; 153(6):1236-7. · 3.76 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We have shown previously that human desmocollin (Dsc) 1 is recognized by IgA autoantibodies of subcorneal pustular dermatosis (SPD) type IgA pemphigus. However, the presence of IgG anti-Dsc autoantibodies is still controversial, and antibodies to Dsc2 and Dsc3 have not been clearly identified. To investigate this by producing recombinant proteins consisting of the entire extracellular domains of human Dsc1, 2 and 3 in baculovirus, and to use them to establish an enzyme-linked immunosorbent assay (ELISA). By this ELISA, we examined in total 165 cases of various types of autoimmune bullous diseases, as well as 23 normal controls. None of 45 sera of classical pemphigus showed either IgG or IgA antibodies to any Dsc. In contrast, one atypical pemphigus serum showed both IgG and IgA antibodies to Dsc1, which were adsorbed by incubation with Dsc1 baculoprotein. Furthermore, this ELISA detected both IgA and IgG anti-Dsc3 antibodies in one atypical case, and IgA antibodies to both Dsc2 and Dsc3 in another. This reactivity was confirmed by positive IgA immunofluorescence with Dsc2 and Dsc3 expressed on COS-7 cells. These results show that both IgG and IgA autoantibodies against all of Dsc1-3 are present in the sera of particular cases of nonclassical pemphigus, except for IgG antibodies to Dsc2, but that they are not detected in classical pemphigus. Unexpectedly, although IgA antibodies of all of eight SPD type IgA pemphigus sera reacted with Dsc1 expressed on COS-7 cells, only one serum was positive in Dsc1 ELISA for IgA. This result indicates either that Dscs expressed by baculovirus may not adopt the correct conformation or that Dscs may need association with other molecules to express all the epitopes for autoantibodies.
    British Journal of Dermatology 08/2004; 151(1):73-83. · 3.76 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The sera of epidermolysis bullosa acquisita (EBA) react with type VII collagen, a major component of anchoring fibrils, in which the major epitopes have been considered to be present in the N-terminal noncollagenous (NC) 1 domain. To determine whether there are also epitopes in the C-terminal NC2 domain, and to determine their ultrastructural localization. Immunoblotting using recombinant proteins of the NC1 and NC2 domains of type VII collagen, and postembedding immunoelectron microscopy. Twenty of 28 EBA sera tested reacted with the NC1 domain and eight sera reacted with the NC2 domain. The sera that reacted with the NC1 domain showed immunoreactivity within the lamina densa and the sera that reacted with the NC2 domain showed immunoreactivity in the dermis 300-360 nm below the lamina densa. This study clearly identified the presence of epitopes in the NC2 domain, and showed that the epitope in the NC1 domain is present in the lamina densa and that the epitope in the NC2 domain is in the dermis below the lamina densa.
    British Journal of Dermatology 06/2004; 150(5):843-51. · 3.76 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Anti-laminin 5 cicatricial pemphigoid (CP) is a mucosal-dominant subepithelial blistering disease characterized by IgG anti-basement membrane zone autoantibodies, that bind to dermal side of 1 M NaCl split skin and immunoprecipitate laminin 5. Laminin 5 is an epidermis-specific extracellular matrix consisting of alpha3, beta3 and gamma2 subunits. Recent studies have suggested that autoantibodies of anti-laminin 5 CP recognize the G domains of alpha3 subunit. We examined the reactivity of anti-laminin 5 CP by immunoblotting using purified laminin 5 and recombinant proteins of alpha3 subunit. We first examined the reactivity of anti-laminin 5 CP by immunoblotting using purified laminin 5. To further investigate the epitopes in the G domains of alpha3 subunit, we produced recombinant proteins of G1-2, G1-3, G2-3, G3-5 domains, that covered entire G domain, and examined the reactivity of anti-laminin 5 CP sera with these recombinant proteins by immunoblotting. By immunoblotting using purified laminin 5, 7 of 21 anti-laminin 5 CP sera reacted with alpha3 subunit, while 8 sera reacted with beta3 subunit and one serum reacted with gamma2 subunit. Two sera reacted with both alpha3 and beta3 subunits, while seven sera did not show positive reactivity. This result indicates that the reactivity of anti-laminin 5 CP sera is much more heterogeneous, although the previous studies suggested that most sera reacted with alpha3 subunit. However, in the studies using recombinant proteins of G domains of alpha3 subunit, none of the CP sera, including the sera reactive with alpha3 subunit in purified laminin 5, reacted with any recombinant proteins. The reason for this negative reactivity with the recombinant proteins is not clear. The immunoblotting using purified laminin 5 should be useful technique for the diagnosis of anti-laminin 5 CP, although the sensitivity was less than conventional immunoprecipitation analysis.
    Journal of Dermatological Science 12/2003; 33(2):113-9. · 3.52 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Besides Brazilian endemic pemphigus foliaceus (EPF), we have described another focus of EPF in Colombia. Our previous study suggested that Colombian EPF seemed to react various plakin family proteins, such as envoplakin, periplakin and BP230. To further characterize the Colombian EPF and study the difference from Brazilian EPF, we examined the antigen profile of the two types of EPF. Immunoblotting using normal human epidermal extracts revealed that 38% Colombian EPF sera and 25% Brazilian EPF sera showed IgG antibodies reactive with desmoglein (Dsg) 1, pemphigus foliaceus antigen. The sera of both types of EPF showed protein bands co-migrating with plakin family proteins, particularly periplakin. Immunoblotting analyses using recombinant proteins of various domains of envoplakin, periplakin and BP230 revealed that a considerable number of Colombian EPF sera reacted with recombinant proteins of periplakin, while only few Brazilian sera reacted with some of the recombinant proteins of any plakins. Enzyme-linked immunosorbent assay (ELISA) for Dsg1 and Dsg3 showed that Dsg1 was reacted by almost all sera of both types of EPF. However, unexpectedly, while none of Colombian EPF sera reacted with Dsg3, about half of Brazilian EPF sera reacted with Dsg3. These results suggested that the Colombian EPF is basically similar to Brazilian EPF in terms that major antigen is Dsg1, but there were some different antigen profiles between the two types of EPF.
    Journal of Dermatological Science 07/2003; 32(1):33-41. · 3.52 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Cicatricial pemphigoid (CP) is an autoimmune bullous disease accompanied by mucosal lesions. The majority of patients with CP have autoantibodies against BP180. Anti-laminin 5 (epiligrin) CP is relatively rare. It is known that, in most cases, circulating autoantibodies against laminin 5 in these patients recognize the alpha3 and/or beta3 subunits of this molecule. Here we report a case of anti-laminin 5 CP, which showed IgG autoantibodies against the gamma2 subunit of laminin 5 alone. A 50-year-old woman suffered from skin blistering on the trunk and extremities and severe mucosal lesions in the eyes, oral cavities and laryngopharynx. Despite potent systemic steroids, the mucosal lesions and some parts of the skin lesions persisted. Salazosulfapyridine was of value in controlling the laryngopharyngeal lesions and persistent cutaneous blistering, and cyclophosphamide had definite effects especially on ocular lesions. Anti-laminin 5 autoantibodies became undetectable in serum from the patient after the disease was controlled.
    European journal of dermatology: EJD 15(3):189-93. · 1.95 Impact Factor