36
A. fumigatus with rare cases due to non-fumigatus. Patients suffering with underlying cavitary lung disease such as tuberculosis, sarcoidosis, bronchiectasis, systemic immunodeficiency, and cystic fibrosis are mainly affected by aspergilloma.
The fungal development occurs within the cavity and is noninvasive and usually
asymptomatic (Latgé 1999). The allergens and toxins secreted from the fungi
inside the host organism may induce the symptomatic changes like cough, weight
loss, and hemoptysis during massive and fatal stages of the infection (Chen
et al. 1997).
Chronic pulmonary aspergillosis: Chronic pulmonary aspergillosis mainly affects
the individuals with tuberculosis. In this condition one or more fungal balls may
form in the lungs, and this likely to becomes a long-term (3 months or more)
condition (Denning et al. 2011).
Invasive aspergillosis (IA): IA is a complex infection in human that is known to
affect patients with weakened immune systems, such as those who are immunosuppressed due to organ transplant or a stem cell transplant. IA usually affects
the lungs of the patients, but sometimes spreads to other parts of the body
(Kramer et al. 1991; Kemper et al. 1993).
Cutaneous (skin) aspergillosis: In cutaneous infections of Aspergillus, the fungus
enters the body through the pores in the skin and causes infection in patients with
immune suppression (Hogan et al. 1996). Human immunodeficiency virus
(HIV)-infected patients infrequently develop cutaneous aspergillosis; this invasive aspergillosis spreads to the skin from some other parts of the body, mainly
the lungs. Several investigations stated the various conditions of cutaneous
aspergillosis in HIV patients at different age groups (Jo-Anne H. van Burik
et al.). Some of the non-HIV-infected immunocompromised patients with this
infection include burn victims, cancer patients, infants, and bone marrow and
solid organ transplant patients.
3.2 Role of Siderophores in Fungal Diseases
The need of new efficient therapeutics is in demand to overcome the resistance of
fungal pathogens against the available antifungal agents and drugs. Iron acquisition
mechanisms could be an efficient approach for fungal pathogens. Fungal siderophores are the high-affinity iron-chelating compounds secreted by fungi, serving as
iron transporters to membrane (Neilands 1995). Aspergillus spp. have the ability to
synthesize their own siderophores, in which iron is crucial for the growth and development of microorganisms. Aspergillus is one of the important opportunistic human
fungal pathogens which secrete their own siderophores under iron-limiting conditions which is crucial for growth and development of fungal organisms and plays a
significant role in virulence and propagating infection (Diekmann and krezdorn 1975).
S. Jayapalan et al.
A. fumigatus with rare cases due to non-fumigatus. Patients suffering with underlying cavitary lung disease such as tuberculosis, sarcoidosis, bronchiectasis, systemic immunodeficiency, and cystic fibrosis are mainly affected by aspergilloma.
The fungal development occurs within the cavity and is noninvasive and usually
asymptomatic (Latgé 1999). The allergens and toxins secreted from the fungi
inside the host organism may induce the symptomatic changes like cough, weight
loss, and hemoptysis during massive and fatal stages of the infection (Chen
et al. 1997).
Chronic pulmonary aspergillosis: Chronic pulmonary aspergillosis mainly affects
the individuals with tuberculosis. In this condition one or more fungal balls may
form in the lungs, and this likely to becomes a long-term (3 months or more)
condition (Denning et al. 2011).
Invasive aspergillosis (IA): IA is a complex infection in human that is known to
affect patients with weakened immune systems, such as those who are immunosuppressed due to organ transplant or a stem cell transplant. IA usually affects
the lungs of the patients, but sometimes spreads to other parts of the body
(Kramer et al. 1991; Kemper et al. 1993).
Cutaneous (skin) aspergillosis: In cutaneous infections of Aspergillus, the fungus
enters the body through the pores in the skin and causes infection in patients with
immune suppression (Hogan et al. 1996). Human immunodeficiency virus
(HIV)-infected patients infrequently develop cutaneous aspergillosis; this invasive aspergillosis spreads to the skin from some other parts of the body, mainly
the lungs. Several investigations stated the various conditions of cutaneous
aspergillosis in HIV patients at different age groups (Jo-Anne H. van Burik
et al.). Some of the non-HIV-infected immunocompromised patients with this
infection include burn victims, cancer patients, infants, and bone marrow and
solid organ transplant patients.
3.2 Role of Siderophores in Fungal Diseases
The need of new efficient therapeutics is in demand to overcome the resistance of
fungal pathogens against the available antifungal agents and drugs. Iron acquisition
mechanisms could be an efficient approach for fungal pathogens. Fungal siderophores are the high-affinity iron-chelating compounds secreted by fungi, serving as
iron transporters to membrane (Neilands 1995). Aspergillus spp. have the ability to
synthesize their own siderophores, in which iron is crucial for the growth and development of microorganisms. Aspergillus is one of the important opportunistic human
fungal pathogens which secrete their own siderophores under iron-limiting conditions which is crucial for growth and development of fungal organisms and plays a
significant role in virulence and propagating infection (Diekmann and krezdorn 1975).
S. Jayapalan et al.